The indicator for the detection of ammonia
(57) Abstract:The indicator for the detection of ammonia. The inventive indicator for the detection of ammonia is a base (for example, silicate glass) coated with a solid copolymer of methyl methacrylate and Triethylenetetramine (the ratio of the monomers, respectively, 50 - 60; 40 - 50, wt. %) containing molecular dissolved in the copolymer dye 0.5 to 3.0 wt.%, counting on the monomers. The invention relates to the control of hazardous substances in the environment and concerns of the indicator for the detection of ammonia.The closest in technical essence to the invention is the indicator for the detection of ammonia, comprising a solid carrier, such as glass and put the indicator substance type of bromocresol purple /1/.This indicator does not allow the detection of ammonia in the aquatic environment and can work only as an indicator of disposable action.The aim of the invention is the creation of an indicator of multiple actions, which allows the determination of ammonia in gas and in water.To solve this problem proposed by Indyk is the one and Triethylenetetramine, having a ratio of monomers, by weight.h. The methyl methacrylate 50-60 Triethyleneglycoldinitrate and containing 0.5 to 3.0 wt. (counting on the monomers) molecular dissolved in the copolymer of dye bromocresol purple 40-50
The amount of dye is less than 0.5 wt. does not sufficiently intense coloration of the indicator and the number of more than 3.0 wt. higher solubility of the dye in the copolymer.The specified copolymer prepared by mixing the original monomers, inert solvent, initiator and dye of bromocresol purple, followed by polymerization and removal of the inert solvent. The result is a solid copolymer with molecular-soluble dye. The indicator is obtained by the above-described procedure based on (for example, silicate glass).P R I m e R 1. Prepare a mixture of 2.16 ml (60%) of methyl methacrylate, of 1.44 ml (40%) of Triethylenetetramine and 0.7 ml of octane in the mixture is dissolved 105 mg of dye bromcresol Magenta, and 5 mg of azo-bis-isobutyronitrile. The resulting solution was vacuum and poured into a mold consisting of two silicate glasses and placed between them an annular gasket. One of the surfaces of glass, koncarevic at 80aboutC for 10 h and at 110-115aboutWith over 8 hoursAfter polymerization, the form is dismantled, washed in acetone, dried and receive indicator representing the base (plate silicate glass) coated with a layer of solid copolymer containing dissolved molecular dye bromocresol purple. By placing the indicator in the gas or aqueous medium containing ammonia, its color changes from yellow to blue.Using this indicator is to analyze vapor or aqueous medium containing 0.01% ammonia. Error definitions in both cases did not exceed 20%
P R I m m e R 2. The indicator is prepared according to example 1, but take 17,5 mg of dye bromocresol purple. Received indicator analyze vapor or aqueous medium containing 0.01% ammonia. The detection error does not exceed 20%
P R I m e R 3. The indicator is prepared according to example 1 with the ratio of initial monomer 50% 50% dye bromocresol purple take in the amount of 51 mg of the Obtained indicator used for the analysis of both vapor and aqueous medium containing 0.01% ammonia. Error definitions in both cases did not exceed 20%
P R I m e R 4. The indicator is prepared by Primack and water pollution, containing 0.01% ammonia. Error definitions in both cases does not exceed 20%
P R I m e R 5. The indicator obtained in example 1, and used for detection of ammonia, soak in hot water at 80-100aboutWith recovery properties. After processing, the indicator used for the analysis of vapor or aqueous medium containing 0.01% ammonia. Error definitions in both cases does not exceed 20%
Thus, the proposed indicator provides detection of ammonia in gas and in water and can be reused. The INDICATOR FOR the DETECTION of AMMONIA, comprising a solid carrier, such as glass, and put the indicator substance type of bromocresol purple, characterized in that bromocresol purple is dissolved to a concentration of 0.5 - 3.0 wt.% in the solid copolymer of methyl methacrylate and Triethylenetetramine the next time quantitative ratio, wt.%:
The methyl methacrylate - 50 - 60
Triethylenemelamine - 40 - 50
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.
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.
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.
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.
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.