RU95102660A - Method of estimating filtration-absorption capacity of systems affected by ortho-chlorobenzalmalonodinitrile - Google Patents

Abstract

FIELD: analytical chemistry. SUBSTANCE: invention deals with detection and quantitative determination of o-chlorobenzalemalonodinitrile when individual means of respiratory organs are tested. In order to estimate protective capacity of filtration-absorption systems in respect to vapor and air sol of the substance, it is necessary to quantitatively evaluate the substance in initial and transmitted air media. From chemical control data, various parameters of protective capacities of system prototypes are determined. Current technology of estimation of systems is characterized with high requirements in safety and level of conducting chemical control. Existing analytical methods do not fully meet these requirements, especially as to sensitivity, accuracy, reproducibility, technological efficiency, and capacity. Proposed analytical procedure is based on reaction of the substance with p- dimethylaminobenzaldehyde followed by measuring optical absorption of colored reaction products on wavelength 433 nm. The reagent is used in 0.01 M concentration in bipolar aprotonic solvent (acetone) with volume ratio of sample to reagent being 50:8, which 3-4 times increases operating efficiency. EFFECT: substantially improved analytical procedure.

Claims (1)

The invention relates to analytical chemistry, namely to the analysis of orthochlorobenzalmalonodinitrile, its detection and quantitative determination when testing samples of personal respiratory protective equipment. This method can be used in various institutions of the Ministry of Defense, as well as in industrial enterprises. When assessing the protective properties of filtering-absorbing systems (FPS) by vapor and aerosol of a C-Es substance, it is necessary to quantify this substance in the source and break-through air environments. According to chemical control data, various parameters of the protective properties of PPS prototypes are determined by the physiologically active substance C-Es. The existing technology for assessing FPS samples on a C-S material requires high safety requirements and the level of chemical control. The aim of the invention is to increase the reliability and reproducibility of the assessment of protective properties, increase the sensitivity and accuracy of chemical control and simplify its technology when testing FPS samples for vapors and aerosol of C-Es material. To do this, the quantitative determination of the substance Cu-Es is based on the reaction of this substance with para-dimethylaminobenzaldehyde (p-DABA), followed by measuring the optical density of the colored reaction products at a wavelength of 433 nm. The difference between this invention and the prototype is that the use of 0.01 M p-DABA as a color reagent in a dipolar aprotic solvent (acetone) with a sample-color reagent volume ratio of 50: 8, respectively, allows quantitative analysis of the substance when testing FPS samples, which leads to an improvement in the basic metrological characteristics and an increase in labor productivity by 3-4 times.