Indicator composition for detection of disinfectants with active substance based on quaternary ammonium compounds

FIELD: chemistry.

SUBSTANCE: invention describes an indicator composition for the detection of disinfectants with an active substance based on quaternary ammonium compounds on surfaces of subjects and detection of disinfection completeness by aerosol spraying, which contains a 0.5-1.5% solution of trinitrotoluene in monoatomic alcohol, with propyl alcohol being applied as the monoatomic alcohol.

EFFECT: convenience and safety of application, increased term of working capacity and interval of application temperatures, protection of the environment, possibility of application at work on vertical, inclined and horizontal surfaces.

1 tbl

 

The invention relates to the field of disinfection, in particular to an indicator composition for detection of the active ingredient of disinfectants on the surfaces of objects.

In the complex of anti-epidemic and sanitary-hygienic activities in infectious foci, an important element is the disinfection treatment of the surfaces of objects. Existing indicator compounds for assessment of the completeness of disinfection of various surfaces implemented in the form of test tickets, papers or napkins.

The closest to the claimed indicator composition and selected as a prototype is a well-known indicator composition for determining the quality of disinfectant formulations based on Quaternary ammonium compounds in solution and on the surface of objects made in the form of flat cloth. Flat napkin type "Desiccant-HOUR" can be used for the qualitative detection of traces of disinfectants based on Quaternary ammonium compounds (H) on the surfaces of medical, food processing equipment and walls of the premises after disinfection. However, the modes of their use for this purpose so far not worked out. Performance indicator napkins stored only at temperatures above + 5°C. shelf Life in�important packaging is 12 months, and once opened they should be used within 3 days.

Napkins "Desiccant-HOUR" is a strip of base paper with a dimension of 55×45 mm, impregnated with an indicator compound and Packed by 10 PCs. in bags of metallized film. The sensitivity indicator wipes - 0.5-1.0 mg/L. Determination of traces of disinfectants is carried out visually by the appearance of a blue to dark blue coloration of the indicator wipes after contact with the inspected surface. To conduct the discovery necessary to wipe wipe the surface under examination.

In the case of processing the surface of the detergents appear spot bright lilac color.

Wipes are made of NPF "WINAR" in accordance with TU 2642-034-11764404-2003. Warranty period of storage of napkins 12 months. Storage conditions: under temperature from + 5 to + 40°C, relative humidity of 80%, excluding the direct sunlight, exposure to vapours of chemicals, water, atmospheric precipitation. Can be transported in a temperature of minus 15°C.

[see http://vinar.ru/catalog/7/1.html - prototype].

However, an indicator composition for detecting an HOUR in the form of a flat wipes are as follows:

short term storage of napkins - 12 months, and in the opened condition with no more than 3�current;

to detect a need for direct human contact with the analyzed surface, which leads to inconvenience in use and ensures the safety of the works;

not allowed exposure to vapours of chemicals;

narrow temperature range;

color indication of the effect varies depending on the impurities present.

The technical result achieved by the invention when applying this indicator composition in the aerosol device is the convenience and safety of use in increasing the length of time and working temperature range of application, in ensuring the protection of the environment, the possibility of using when working on vertical, inclined and horizontal surfaces.

The technical result is achieved in that the indicator composition for detection of disinfectants with active substance on the basis of Quaternary ammonium compounds on the surfaces of objects and identifying completeness of disinfection, when the aerosol spray, contains 0.5-1.5% solution of TNT in the Monohydric alcohol and the Monohydric alcohol propyl alcohol is used.

The stated indicator composition for detection of disinfectants with active substance on the basis of Quaternary ammonium Conn�changes on the surfaces of objects and identifying completeness of disinfection by spray atomization. The indicator composition contains 0.5-1.5% solution of TNT in the Monohydric alcohol and the Monohydric alcohol propyl alcohol is used.

Detection is carried out by spraying the indicator composition to the surface under examination using the aerosol device, and identifying completeness of disinfection is carried out after at least 1 hour and no later than 2 hours after treatment for the appearance of the characteristic indicative of the effect of brown staining on the surface of the object.

Aerosol device for detection of substances on the basis of Quaternary ammonium compounds is a spray volume of 150 ml, equipped with a sprayer and filled with tracer formulations on the matter on the basis of Quaternary ammonium compounds. As such disinfectants can be "Ketamin", "Ketamin AB", "MTC-50," "Nosodes Forte", "Nosodes-50" "Effect-Forte and others on the basis of operation of the device is the reaction occurring in the interaction of substances on the basis of Quaternary ammonium compounds with alcohol solution of TNT, resulting in the appearance of the characteristic brown staining, and the staining appeared persists for a long time (over 5 days).

The advantages of using this indicator composition in the aerosol device before famous�mi indicator compositions in particular, the napkin flat, are as follows:

long shelf-life indicating composition (over 2 years);

no need of direct contact of the operator with the analyzed surface;

multiple use packaging (at least 100) that allows you to repeatedly define the surface of the object;

ability to function in temperatures ranging from 0°C to + 50°C;

provides a large area of control;

used the indicator composition is not toxic;

do not use freon with its ozone-depleting potential;

the aerosol device is made of a polymeric material and is corrosion-resistant and shockproof;

not required sampling, with their subsequent processing and analysis in a specialized laboratory;

convenience and safety in use;

the conservation analytical properties in the presence of possible contaminants (oil, fuel, etc.);

allows detection on vertical, inclined and horizontal surfaces;

the composition is prepared on the basis of alcoholic solutions and is non-toxic, in case of contact with exposed skin is enough to wash it off with soap and water;

provides contrast and stable over time indicative effect, with�renaudie a long time.

Experimental storage showed stability indicator composition when stored in an aerosol device and maintaining its performance for a period of not less than 2 years.

Experimental studies have shown that the greatest sensitivity, speed and specificity has a flat part on the basis of TNT and propyl alcohol, consisting of (wt.%):

TNT0,5-1,5
the propyl alcohol98,5-99,5

At a lower content of TNT is not ensured the visibility of the obtained indication of the effect, and the use of higher concentrations of TNT impractical due to his limited solubility in a solution of propyl alcohol.

To detect disinfectant formulation directly on the surface of objects exposed to the processing of disinfectants based on Quaternary ammonium compounds, using the aerosol device perform the following operations:

remove cap from pump and spray put spray device at a distance of 10-20 cm from the measured surface with respect to the direction of the wind;

repeatedly pressing the button�at the pump and spray spray indicator solution to the surface under examination;

to observe the appearance on the controlled surface indicative of the effect.

The coloration in accordance with the standard indicates the presence on the surface disinfectant formulations based on Quaternary ammonium compounds.

Indicative effect persists for a long period of time (several days).

In cases where the indication effect is not clear, and when you match the skin color with the color indicative of the effect, wetting indicator composition cotton-gauze disk or a strip of filter paper, wiped them of the analyzed surface area of about 100 cm2and watched the appearance indicative of the effect on the surface of filter paper. Perhaps the application of the indicator composition directly on the surface under examination followed by wiping it with a cotton-gauze disk.

In the experimental conditions was carried out by plating on stainless steel plate, aluminum, tile and painted with XB-518 area of 100 cm2by spraying a 1% aqueous solution of Ketamine-AB with an application rate of 1.0 l/m2.

The application of a 1% solution of Ketamine-AB on the surface was carried out by spraying with a spray device. Dispersion of aerosol disinfectant Retz�tours was 100-200 μm. After applying the disinfectant formulations of the surface and detection was maintained at the test temperature (0°C, + 20 and + 50°C) for at least 1 h. After 1 h, 1.5 h and 2 h after application on plates containing disinfectant formulations moistened cotton-gauze disks or strips of filter paper from the aerosol device of the indicator composition. Then carried out the sampling disinfectant formulations by wiping them across the surface finish without compromising its integrity during 1 min.

On the other plate with the disinfectant formulation, as well as on cotton-gauze disks and strips of filter paper obtained after the surface treatment, from a distance of 10-20 cm was applied from the aerosol device indicator composition for detection of disinfectant formulations based on Quaternary ammonium compounds.

Observed the appearance of cotton-gauze disks and filter strips characteristic indicative of the effect.

In the case of a flat spray of the composition from the aerosol device directly on the analyzed surface was observed the emergence of an indicative effect on this surface. Recorded the time of occurrence of the indication effect. The test results are shown in the table.

Table. The time of appearance indicative of the effect when applied Indyk�Torno composition to the surface under examination, treated with 1% solution of catamine AB

The results of the tests showed that the tracer composition in the aerosol device without the use of expensive equipment and reagents maintains its efficiency and provides detection of disinfectant formulations based on Quaternary ammonium compounds (ketamine, ketamine-AB, PTS-50, etc.) on various surfaces in the temperature range from 0°C to 50°C after 2 h after treatment of the surface of the disinfectant formulation.

The time of appearance indicative of the effect when applying the indicator composition on the examined surface treated with a 1% solution of catamine AB is 25-70 seconds depending on the surface temperature.

Thus, the proposed indicator composition for the detection of substances on the basis of Quaternary ammonium compounds on the surfaces of objects in a wide range of operating temperatures. The aerosol device has a low cost, optimal weight and size characteristics, provides low specific consumption of the indicator composition, when sprayed to achieve the required dispersion and uniformity of the spray.

As substances on the basis of Quaternary ammonium compounds can be detected ketamin, ketamin-AB, PTS-50 andother.

The aerosol device with the proposed indicator composition may be supplied in kit. This kit is designed to detect substances on the basis of Quaternary ammonium compounds on horizontal, inclined and vertical surfaces.

The kit includes:

Aerosol device for detecting substances2
on the basis of Quaternary ammonium compounds, units, including:
the pump-dispenser, EA.1
housing, units1
the indicator composition, l0,12
label, EA.1
Accessory kit, PCs., including:1
the pump-dispenser, EA.1
cotton-gauze disk with a diameter of 60 mm, EA.100
maintenance documentation for-t1
cardboard containers, pieces 1

Identifying the main characteristics of the kit for detection of substances on the basis of Quaternary ammonium compounds:

preparation for work, not more, min1
detection time on the basis of Quaternary ammonium compounds,
no more mines4
save indication of the effect, not less, hours1
threshold sensitivity, mg/ml5·10-1
operating temperature range, °C0 - + 50
the mass OW, kg, not more than0,15
size of detected drops, not less, microns150
the multiplicity of usage, not less than150
warranty period of storage, not less, years2

The scope of the set:

quality control of disinfection by the presence of residual amounts of the active substance �of desinfectant after irrigation surface;

detection of leaks (spills, pollution and surfaces of objects after the transportation of substances on the basis of Quaternary ammonium compounds;

quality cleaning surfaces of objects from traces of disinfectant formulations based on Quaternary ammonium compounds after disinfection.

The proposed solution is industrially applicable, as to its implementation can be used standard equipment and common materials and chemicals.

An indicator composition for detection of disinfectants with active substance on the basis of Quaternary ammonium compounds on the surfaces of objects and identifying completeness of disinfection by spray atomization, characterized in that it contains 0.5-1.5% solution of TNT in the Monohydric alcohol and the Monohydric alcohol propyl alcohol is used.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: indicator testing means for determining content of N-methylaniline in hydrocarbon fuels is neutral aluminium oxide with potassium ferricyanide immobilised on the surface thereof, moulded in form of pellets. The method of determining content of N-methylaniline in hydrocarbon fuels using said indicator testing means is carried out based on colour change thereof after coming into contact with a sample of the analysed sample.

EFFECT: reliability of determining lower concentrations of N-methylaniline in hydrocarbon fuels.

2 cl, 1 tbl, 2 ex

FIELD: measurement equipment.

SUBSTANCE: invention relates to nondestructive examination, to study of metal properties and is intended for confirmation of exhaustion of protective properties of heat-resistant diffusive coatings on details made of carboniferous heat-resistant alloys. The method of confirmation of exhaustion of protective properties of heat-resistant diffusive coatings on details made of carboniferous heat-resistant alloys by change of physical and chemical properties of the surface layer of heat-resistant diffusive coatings during operation in conditions of high temperature, comprises application of reagent on the coating surface, and the fact of exhaustion of protective properties of the heat-resistant diffusive covering is witnessed visually by change of colour of the surface of heat-resistant diffusive coating with formation of carbon and black oxides during the process of chemical reaction between carbide phases, forming in the surface layer of the heat-resistant diffusive coating at the late stages of operation, and reagent.

EFFECT: simplicity, reliability and reliability of tests is achieved.

1 ex, 5 tbl, 10 dwg

FIELD: medicine.

SUBSTANCE: invention refers to medicine and describes using resorufin and/or toluidine blue used as an organic oxidation-reduction colouring agent, one or more polyols, glycerol, and water introduced into gelatine and/or hydroxyethylstarch, and/or methlcellulose used as additives, as an oxygen indicator. The indicator is configured so that an oxygen-sensitive product stays visible.

EFFECT: declared invention provides the light- and heat-sensitive visibly discolouring oxygen indicator.

19 cl, 6 tbl, 10 ex

FIELD: measurement equipment.

SUBSTANCE: invention relates to ecology, namely to sanitary-chemical control of the state of environment and can be used for solution of tasks for detection and measurement of harmful substance concentrations in the air. A device for detection of harmful substances in the air includes an air flow booster and the primary chemical transducer; with that, the air flow booster includes the following: a control unit providing setting of parameters of bleed air, operation and control of the device; an air path for transportation of an air flow; an air pump connected to the control unit for pumping of air through the air path; a self-contained power source, and the primary chemical transducer is connected to the air path. With that, the device includes flow and temperature sensors of the pumped air, which are arranged in the air path, as well as sensors of atmospheric pressure and relative humidity of the pumped air, which are arranged outside the air path, and the control unit includes an information display device; at least one control button and an electronic circuit providing the following: recording of data from sensors; determination of air density; control of volumetric flow of the pumped air; adjustment of air sampling time, and analogue-to-digital conversion of the obtained and transmitted data.

EFFECT: improving accuracy of taken air volumes; increasing quick action of operation of the device; control and fixation of parameters of the taken air (volumetric air flow rate, atmospheric pressure, temperature and humidity); increasing ease of use; improving accuracy of readout of information from the primary chemical transducer; providing technical control and fixation of colorimetric changes of the primary chemical transducer; reducing overall dimensions and the weight of the device; enlarging functional capabilities.

24 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry, namely to photometric determination of small concentrations of iron (III) in solutions of pure salts. The method includes conversion of iron (III) in a complex compound with an organic reagent and a surface-active substance in a mildly acidic medium by heating the above on water bath with following photometry of the obtained solution, and to a solution of iron (III) with pH 3.9-.5.2 added is 50-fold quantity of an organic reagent, represented by xylenol orange, 1.8-2.2 ml of a surface-active substance in the form of a 2% solution of ETHAL LA-7, and water to 10 ml of the volume with the following heating on water bath at a temperature of 60-80°C for 15 min and addition of 1 ml of acetone into the obtained solution.

EFFECT: invention makes it possible to increase the analysis sensitivity.

1 ex

FIELD: instrumentation.

SUBSTANCE: invention relates to the field of gases identification and refers to a spectral analysis system for gases identification using a treated tape. The system includes a treated tape, an adjustable colour source, a photodiode, a colour identification sensor and a microprocessor. The adjustable colour source emits radiation in the direction of the treated tape with multiple varied wavelengths. The photodiode measures the radiation reflected from the treated tape. The microprocessor analyses the measurement results and, proceeding from the colour identified and the colour spot intensity, identifies the type and concentration of the gas the treated tape has been exposed to. Additionally, the microprocessor, with the help of the colour identification sensor, controls the radiation wavelength of the adjustable colour source and, whenever required, corrects the colour source radiation.

EFFECT: technical effect consists in increased sensitivity and ensuring the possibility of different type gases detection.

13 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: at first sample of tested oil product with fixed volume is passed through water-coagulating agent placed between turns of a flat spiral mounted in a cavity of the element having shape of a truncated cone. When the sample is passed along the spiral the time for coagulation of free water microdrops in the sample is extended. Then the sample of the tested oil product is passed through a filter membrane with a deposited layer of water-sensitive chemical agent. At that by means of the hollow element having shape of a truncated cone this sample is localised at the surface of this water-sensitive chemical agent and water availability or concentration is evaluated by its colour changing. Additionally water concentration in the sample of the tested oil product is evaluated against decrease of the sample fixed volume before the water-sensitive chemical agent changes its colour.

EFFECT: improved accuracy of the analysis.

1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to field of analytical chemistry, namely to photocolorimetric method of analysis, and can be used for determination of iron (II) content in extract of spruce needles, containing iron (II) in very low concentration. Method includes its transfer into complex compound with organic reagent, with addition of 150-200-fold amount of organic reagent to solution of iron (II) with pH 3, as reagent used is Congo red, 0.2-0.4 ml solution of surface-active substance in form of 0.2% solution of 6-aminocapronic acid, and water to 10 ml with further heating on water bath at temperature 80-98°C for 10-15 min.

EFFECT: increased analysis sensitivity.

1 ex

FIELD: chemistry.

SUBSTANCE: invention describes a method of determining aluminium (III), which involves preparing a sorbent, an aluminium (III) solution, extracting aluminium (III) from the solution using the sorbent and conversion thereof into a complex on the surface of the sorbent, separating the sorbent from the solution, measuring luminescent intensity of the surface aluminium (III) complex and determining content of aluminium from a calibration curve. The sorbent used is silica gel which is successively modified with polyhexamethylene guanidine and 7-iodo-8-hydroxyquinoline-5-sulphonic acid, and luminescent intensity is measured at 495 nm.

EFFECT: low threshold of detecting aluminium, wider range of determined content, low consumption of the organic complexing agent.

4 ex, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention can be used to determine content of iron (II) in solutions of pure salts containing iron (II) in very low concentrations. The method involves converting iron (III) into a complex compound with an organic reagent in a weakly acidic medium. The iron (II) solution with pH 2-5 is mixed with 200-300 times the amount of the organic reagent which is Congo red, 0.2-0.4 ml surfactant solution in form of a 0.2% solution of monoalkyphenyl ester of polyethylene glycol based on a polymer distillate and 10 ml water, followed by heating on a water bath at temperature of 80-98°C for 10-15 minutes.

EFFECT: high sensitivity of analysis.

5 dwg, 1 ex

FIELD: analytical methods.

SUBSTANCE: group of inventions is directed on detecting and quantitatively determining hydrogen radicals present in water or in aqueous solution and is characterized by adding sodium 3,5-dibromo-4-nitrosobenzenesulfonate to sample to detect hydrogen radicals from coloration appearing as a result of their absorption characteristics, and additionally characterized by blowing gaseous hydrogen through 1,1-diphenyl-2-picrylhydrazide solution absorbing near 517 nm and sodium 3,5-dibromo-4-nitrosobenzenesulfonate solution at constant velocity in presence of platinum black in order to quantitatively evaluate hydrogen radical concentration using calibration curve based on correlation between coefficient of absorption near 450 nm for azo compound of sodium 3,5-dibromo-4-nitrosobenzenesulfonate and concentration of hydrogen radicals appeared.

EFFECT: increased determination accuracy and enabled analysis of hydrogen radicals in various media.

6 cl, 15 dwg, 1 tbl, 5 ex

FIELD: analytical methods in environmental monitoring.

SUBSTANCE: method comprises: sampling, acidifying samples with HCl/H2SO4 mixture, adding Ce(SO4)2 as oxidant and removing its excess with reducing agent NH2OH·HCl, adding rhodamine C as organic reagent, extracting resulting complex, separating organic phase from aqueous phase, and measuring optical density. Extraction is performed with carbon tetrachloride/methyl isobutyl ketone mixture at 5:1 volume ratio and extractant-to-sample volume ratio 1:1 under dynamic conditions by way of washing away complex with extractant. Content of antimony is judged of from difference of optical densities of extractant and mixture.

EFFECT: lowered measurement threshold to values comparable with allowable limits, increased reliability, reduced analysis time, and automated analytical procedure.

3 cl, 1 dwg, 3 tbl, 3 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to preparing analytical reagents eliciting selectivity and high sensitivity with respect to transient metal cations. Method involves interaction of 2-hydroxythiobenzoyl hydrazone with aromatic aldehydes that results to synthesis of 2-(2'-hydroxyphenyl)-5-(R'-phenyl)-1,3,4-thiadiazolines-2 that have been tested as analytical reagents with metal cation salts of s-, p- and d-elements. Obtained results of investigations have been applied for analysis of medicinal agents containing transient metal cations. Invention provides expanding assortment of analytical reagents used for detection of metal cations of s-, p- and d-elements that can be used in analytical, pharmaceutical and chemical-toxicological practice.

EFFECT: valuable properties of reagents.

1 cl, 2 tbl, 3 ex

FIELD: pharmaceutical chemistry.

SUBSTANCE: the present innovation deals with identifying isoniazide, pyridine derivative, applied to control the quality of production manufactured by pharmaceutical enterprises and prepared by drug stores. One should detect by treating the sample under investigation with freshly prepared 10%-hydroxylamine hydrochloride alkaline solution at obtaining the color. The method creates minimal duration for detection.

EFFECT: higher sensitivity and specificity of the method.

1 ex, 2 tbl

FIELD: analytic chemistry (indicating compositions).

SUBSTANCE: claimed composition contains (mass %): sorbent (anionite, modified with organic reagent) 0.4; hydrochloric acid 0.0011-0.0015; and balance: water. Composition of present invention is useful in determination of Mo(VI) content in natural water and wastewater.

EFFECT: improved sensitivity, increased analysis velocity and decreased effort.

3 tbl

FIELD: analytical chemistry of elements.

SUBSTANCE: the invention is pertaining to the field of analytical chemistry of elements, in particular, to methods of detection of silver availability, that may be used at detection of silver availability in the natural waters and technological solutions. The method of detection of silver availability provides for preparation of a silver solution (1), its transformation into a complex compound and measurement of the luminescent emission intensity. Silver is separated from solutions using a silica gel chemically modified with the help of mercaptogroups and intensity of the silver complex compound luminescent emission (1) is measured with the help of mercaptogroups on the surface of silica gel at 77К at ultraviolet irradiation light. The technical result is simplification of the technological process, decrease of a relative limit of detection, extension of the range of defined concentrations.

EFFECT: the invention ensures simplification of the technological process, decrease of a relative limit of detection, extension of the range of defined concentrations.

3 ex

FIELD: analytical methods.

SUBSTANCE: indicator composition, which is used two-step analytical procedure, contains 0.6% anionite AN-31 in sulfate form (as sorbent), 0.05% 4-(2-pyridylazo)resorcinol (reagent), 0.098-0.1% sulfuric acid as pH-creating reagent in the first step, which is neutralized in the second step with excess (0.0035-0.004%) aqueous ammonia to pH 9. Method can be, in particular, used for assaying waste waters and industrial solutions.

EFFECT: enabled joint determination of the two ions, improved selectivity of analysis, and accelerated analytical procedure.

3 tbl

FIELD: analytical chemistry.

SUBSTANCE: method can be used for determining content of bismuth in copper-based alloys. Bismuth solution (III) is prepared, transferred into complex compound and diffuse reflection factor is measured. Bismuth is selected due to transferring it into complex compound from 0,5-3 M solution of hydrochloric acid by means of sorbent - silica, chemically modified N-allyl-N'-propylthiocarbamide. Diffuse reflection factor of bismuth (iii) complex is measured when taking N-allyl-N'-propylthiocarbamide on the surface of silica.

EFFECT: simplified procedure of measurement; widened range of concentrations to me measured.

4 ex, 1 tbl

FIELD: analytical chemistry, indicating composition for gold (iii) assay in aqueous solutions, in particular in waste water and processing solutions.

SUBSTANCE: claimed composition contains (mass %): anionite as sorbent 0.8; hydrochloric acid 5.8; tin(II) chloride 0.8 and balance: water. Method of present invention makes it possible to detect Au(III) in acidic solutions (pH<2).

EFFECT: method with improved sensitivity and selectivity.

3 tbl

FIELD: analytical methods.

SUBSTANCE: in indicator composition for determining manganese(II), in particular, in waste waters and production solutions, containing 0.6% of sorbent, 0.05% of reagent, medium pH adjusting substance, and water, said sorbent is sulfate-form anionite (AN-31), said reagent is 4-(2-pyridylazo)resorcinol, and pH of medium is adjusted with 0.0035-0.004% of ammonia. Concentration of Mn2+ ions is measured spectrophotometrically in presence of above-defined indicator.

EFFECT: increased determination selectivity and accelerated analytical procedure.

3 tbl

Up!