METHOD FOR DETERMINING FUMES OF BUTYRIC ACID IN PRESENCE OF PALMITIC ACID AND STEARIC ACID IN THE AIR OF WORK ZONE Russian patent published in 2006 - IPC G01N27/00 G01N31/00 C07C53/124 

FIELD: analytic chemistry of organic compounds, possible use for determining fumes of butyric acid in presence of palmitic and stearic acids in the air of work zone of chemical and other industrial plants.

SUBSTANCE: in the method for determining fumes of butyric acid in presence of palmitic and stearic acids in the air of work zone, including taking of a sample, preparation of detecting device for operation, injection of sample into detecting cell and registration of analytic signal, calculation of concentration of butyric acid in accordance to calibrating graph, taken sample is injected into detecting cell with piezo-quartz resonator, electrodes of which are preliminary modified by application of polyethyleneglykol-2000 sorbent onto them in acetone so, that mass of film after removal of solvent in drying stand during 30 minutes at 40°C amounts to 17-25 micrograms, registration of analytic signal is performed after injection of sample into detecting cell in form of response of modified electrodes of piezo-quartz resonator, calculated on basis of difference of its oscillation frequencies prior to injection of sample and after balancing of sorption system with injected sample, concentration of butyric acid is calculated on basis of calibrating graph depending on aforementioned response from its concentration on basis of formula ΔF=3,5·c, where ΔF - response of modified electrodes of piezo-quartz resonator, Hz; c - concentration of butyric acid, mg/m³.

EFFECT: simplification and acceleration of analysis when determining butyric acid in presence of palmitic and stearic acids.

6 ex, 2 tbl