Set of quick tests for presence of explosive materials

FIELD: measuring equipment.

SUBSTANCE: invention relates to devices for the study and analysis of non-biological materials by chemical indicator means for the purpose of rapid detection of explosive residue in a contact test portion, including during examinations in an off-laboratory environment. The quick tests set for the presence of explosives consists of a portable plastic container equipped with an internal cushioning insert with functional recesses, including recesses for installation of microcolumns, bottles with solutions placed in the recesses, as well as micro-column test systems for detecting the presence of chlorates and perchlorates, cases with rolls tapes of reactive indicator materials containing reagents immobilized on the surface of the carrier. Cases with rolls of tapes of reactive indicator materials consist of a body made of an elastic inert material in the form of hollow cylinders with a coaxial cap tightly adjacent to the cylindrical surface. The side walls of the cases have longitudinal slots through which the edge of the tape passes, and in addition, the body and the cover have mutual angular mobility around the axis, providing, when their longitudinal slots are aligned along one line, before the open window is formed, the function of opening the case with release of the edge of the tape, or mutual overlapping of their longitudinal slots function of hermetic sealing of the case with fixation of the edge of the tape.

EFFECT: higher safety of use and simplified operation.

9 cl, 2 dwg, 1 tbl

 



 

Same patents:

FIELD: measurement equipment.

SUBSTANCE: invention relates to methods of indicator detection of trace amounts of explosives and components of explosives on the basis of three groups of compound classes: nitroaromatic compounds; nitramines and nitroesters; ion nitrates. The method of express detection of explosives on the basis of a set of chemical indicators for three groups of classes of nitrogen-containing compounds includes using a reactive indicator material with reagents, previously applied in dosed quantity onto a carrier, besides, the reactive indicator material is a carrier with immobilised azocomponent of Griess reagent, which is in solid chemically modified protected form with covalently bound amides.

EFFECT: increased sensitivity and reliability, as well as faster detection.

4 cl, 4 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to field of analytical chemistry, namely to express-detection of explosive substances (ES) based on organic peroxides. Method is based on fixation of hydroxen peroxide, released in the process of explosive substance decomposition by indicator method. For this purpose change of indicator colour is fixed within 1 minute after contact with solid-phase material, possessing function of surface acidity and providing decomposition of ES to hydrogen oxide. Application of claimed method simplifies analysis of cyclic peroxides due to reduction of the number of analysis stages, as well as to elimination of liquid reagents, including concentrated acids and organic solvents.

EFFECT: invention provides carrying out express-analysis of trace quantities of peroxide ES outside laboratory in wide range of climatic conditions.

6 cl, 2 tbl, 7 ex

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: chemistry.

SUBSTANCE: invention can be applied for the estimation of a washing ability of petrol and diesel fuel and influence of their washing abilities on technical-economic and ecological (TE) characteristics of an engine (E). The method consists in the preliminarily "pollution" of E with an etalon pollution mixture (EPM) of fuel and oil, which ensures its working in a fixed mode. Upon use of 20-40 l EPM the E is stopped, cooled, dissembled and pollutions (P) are registered. Then E works on the test fuel at standard modes (SM). Its TE characteristics are measured. Then P is registered again. Parameters of SM are given.

EFFECT: increased degree of reliability and objectivity of determining the washing ability of petrol and diesel fuel.

9 cl, 4 tbl

FIELD: oil-and-gas industry.

SUBSTANCE: hydrocarbons concentration is measured in vapour-air mix flowing from filler neck as well as time interval from fill in start to initial occurrence of hydrocarbons in said mix, said concentration being taken as the minimum magnitude. Time interval when hydrocarbons concentration reaches maximum magnitude and moment when maximum level in the tank is reached are measured. Bulk of losses of oil or oil products is determined by the formula: M"пп"=V"ц"[(t"ц"tCmax)Cmaxt"ц"+(tCmaxtCmin)(Cmax+Cmin)2tCmax], where M"пп" is bulk of losses caused by evaporation in vapour-air mix emissions, kg; V"ц" is tank volume, m3; t"ц" is time interval from fill in start to maximum fill in level, min; Cmax is maximum concentration of hydrocarbons in said mix, kg/m3; Cmin is minimum concentration of hydrocarbons in said mix, kg/m3; tCmax is time interval from fill in start to occurrence of vapours with concentration Cmax, min; tCmin is time interval from fill in start to occurrence of vapour with concentration Cmin, min.

EFFECT: lower labour input, higher accuracy of loss determination.

1 tbl

FIELD: chemistry.

SUBSTANCE: dispersion-indicator composition is prepared, for which purpose hydrochloric acid and water-alcohol solution of bromophenol blue are introduced into distilled water, obtained composition is combined with petrol sample, into which methyl-tert-butyl ether is preliminarily added, mixture is mixed and settled at room temperature, volume of foamy layer of blue-light blue colour is measured at the boundary of “petrol-water" separation, and if its value is not less than 1 cm3 conclusion about detergent additive in petrol is made.

EFFECT: acceleration of identification with high degree of its reliability.

1 ex, 5 tbl

FIELD: chemistry.

SUBSTANCE: method of evaluating corrosiveness of jet fuel comprises determining the decrease in weight of copper-containing material placed in the fuel before and after testing at high temperature. The copper-containing material used is copper foil which is placed in the fuel and held in hermetically sealed cells in the form of metal vessels at temperature of 150±2°C for 4 hours while holding in two steps of 2 hours each and replacing the fuel after the first step. The greater the decrease in the weight of the copper foil before and after test, the more corrosive the jet fuel.

EFFECT: high reliability and faster evaluation.

1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to chemical methods of expertise of explosive substances and forensic identifying preparations. A method of marking an explosive substance consists in the introduction of a marking composition, containing identifiers, the quantity of which equals the quantity of technical parameters to be marked, into the explosive substance, obtained by mixing of separate components. To mark the explosive substance each separate component, included into the mixture of the explosive substance, is marked. The marking composition for each separate component is composed of at least one polymer material from the group of polyorganosiloxanes with the length of a molecular chain, representing an identifier, different from lengths of molecular chains and values of viscosity of polymer materials in the marking compositions of other separate components, constituting the mixture of the explosive substance. As the marking composition of the explosive substance a set of marking compositions of separate components of the said substance mixture is used.

EFFECT: improvement of marking.

3 cl, 3 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: method includes determination of the density at the fuel temperature 20°C, determination of the averaged boiling temperature Tc, °C, by calculated dependences on temperatures of boiling away of different fuel fractions, setting the density range at 20°C from 700 to 1020 kg/m3, determination of kinematic viscosity at a temperature of 50°C with the fuel density from 860 to 1020 kg/m3 and the temperature of boiling away of final fuel fraction higher than 400°C, equipping a nomogram for CI estimation with an additional scale of viscosity, matched with the Tc scale on the section from 268 to 320°C, setting the Te range from 90°C to 320°C, setting the range of the kinematic viscosity scale from 2.0 to 1000 mm2/s, setting the range of cetane index scale, units, from 0 to 70. The nomogram makes it possible to determine CI of any liquid hydrocarbon fuel (from petrol to the residual one).

EFFECT: extension of assortment of analysed fuels and increased reliability of estimation.

1 dwg, 1 tbl, 4 ex

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the field of analysis of physical properties of liquids. A device contains a container for sampling with a scale with a piston and rod placed in it, software and hardware to measure time and temperature, a tube for liquid intake during sampling in order to determine the relative viscosity, a thermistor which can be installed at the tube during determination of microcone penetration, demulsifying ability and index of the liquid heating dynamics, a cone that can be installed instead of the piston on the rod by means of a threaded connection for determination of microcone penetration, a plug or a cover which can be installed into the container nipple instead of the tube for determination of microcone penetration and demulsifying ability, and a support for the container installation.

EFFECT: simplification and acceleration of the analysis as well as increase in its information content and reliability.

5 cl, 4 tbl, 10 dwg

FIELD: chemistry.

SUBSTANCE: method includes the preparation of a sorbent, solution of iron (III, II), addition of a hydroxylamine solution to reduce iron (III) to iron (II), extraction of iron (II) from the solution by the sorbent, transfer of iron (II) in a complex compound on the sorbent surface, separation of the sorbent from the solution, measurement of the coefficient of diffusion reflection of the surface iron (II) complex and determination of the iron content by a calibration graph, with the application as the sorbent of aluminium oxide, successively modified by polyhexamethyleneguanidine and 3-(2-pyridyl)-5,6-diphenyl-1.2,4-triazine-4',4''-disulphoacid (ferrozine), with carrying out the measurement of a diffusion reflection coefficient at 560 nm.

EFFECT: increased sensitivity and self-descriptiveness of the analysis.

4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used for semi-quantitative determination of cobalt (II) and copper (II) concentration is natural, sewage waters and various liquids under field conditions. Method includes filling glass tube with internal diameter 0.5 cm with Na-form of cation exchanger KB-2E-10 with weight 0.2 g, with further filling with analysed solution, which contains added to it sodium nitrate with concentration 1 mole/l and calcium nitrate to create medium, and estimation of cobalt and copper concentration by length of coloured zone of cation exchanger with the following content of components after tube filling, wt %: cation exchanger KB-2E-10 - 0.8; sodium nitrate - 8.5; calcium nitrate - 0.25; water - the remaining part.

EFFECT: increase of accuracy and reliability and simplification of analysis.

1 ex, 2 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to methods of indicator detection of trace amounts of explosives and components of explosives on the basis of three groups of compound classes: nitroaromatic compounds; nitramines and nitroesters; ion nitrates. The method of express detection of explosives on the basis of a set of chemical indicators for three groups of classes of nitrogen-containing compounds includes using a reactive indicator material with reagents, previously applied in dosed quantity onto a carrier, besides, the reactive indicator material is a carrier with immobilised azocomponent of Griess reagent, which is in solid chemically modified protected form with covalently bound amides.

EFFECT: increased sensitivity and reliability, as well as faster detection.

4 cl, 4 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: method of determining iron (II) includes preparing a sorbent and an iron (III, II) solution; adding hydroxylamine solution to reduce iron (III) to iron (II) and extracting iron (II) from the solution with the sorbent; converting the iron (II) into a complex compound on the surface of the sorbent; separating the sorbent from the solution; measuring the diffuse reflection factor of the iron (II) surface complex and determining content of iron using a calibration curve. The sorbent used is silica which is successively modified with polyhexamethylene guanidine and 3-(2-pyridyl)-5,6-di(2-furyl)-1,2,4-triazine-5',5"-disulphonic acid (Ferene S), and the diffuse reflection factor is measured at 600 nm.

EFFECT: low detection limit and wide range of determined iron content.

4 ex

FIELD: chemistry.

SUBSTANCE: method includes pretreating a sample with an inorganic reagent and determining silicon using a spectrometric method based on a blue-coloured silicon-molybdenum complex followed by re-calculation for silicon dioxide, wherein the reagent used is 20% borofluorhydric acid and treatment is carried out at 70±2°C for 40 minutes.

EFFECT: high selectivity of analysis.

4 tbl

FIELD: chemistry.

SUBSTANCE: claimed is reagent indicator truncated cone, which contains flow hollow profile, inside which sorbent with immobilised on it chromogenic reagents, is placed, with smaller base being input hole of truncated cone, overall dimensions of which are selected by the following dependences: ds = 0.25÷2.5, dl = (4÷50)·ds, ht.c = (8÷100)·ds, where ds and dl are diameters of smaller and larger bases of truncated cone, mm; ht.c is height of truncated cone, mm.

EFFECT: expressivity and increase of sensitivity of ion identification.

2 dwg, 8 ex

FIELD: chemistry.

SUBSTANCE: in order to extract iron (III) from water solutions diphenylguanidine (DPG) is applied as the first organic reagent. As the second organic reagent, salicylic acid (SA) is applied, and as solvent of organic phase chloroform is applied. In organic phase complex with molar component ratio DPG: Fe3+:SA, equal 1:1:1, is extracted. Process of iron (III) extraction is carried out at medium acidity pH=1.5-2.5 with the following detection of iron (III) by trimetric method.

EFFECT: invention makes it possible to increase selectivity and simplify process of extraction and detection of iron from water solutions.

2 cl, 5 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to field of analytical chemistry, namely to express-detection of explosive substances (ES) based on organic peroxides. Method is based on fixation of hydroxen peroxide, released in the process of explosive substance decomposition by indicator method. For this purpose change of indicator colour is fixed within 1 minute after contact with solid-phase material, possessing function of surface acidity and providing decomposition of ES to hydrogen oxide. Application of claimed method simplifies analysis of cyclic peroxides due to reduction of the number of analysis stages, as well as to elimination of liquid reagents, including concentrated acids and organic solvents.

EFFECT: invention provides carrying out express-analysis of trace quantities of peroxide ES outside laboratory in wide range of climatic conditions.

6 cl, 2 tbl, 7 ex

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

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: 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

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