METHOD OF ASSESSING ACETIC ACID VAPORS IN WORKING ZONE AIR Russian patent published in 2005 - IPC

FIELD: analytical methods.

SUBSTANCE: invention relates to assessing acetic acid vapors in working zone air of linoleum, acetylcellulose, and alkyl acetate manufacture enterprises. Method comprises sampling air, detecting and recording analytical signal followed by calculation of acetic acid concentration. Sample is placed in detection cell with piezoquartz resonator whose electrodes are preliminarily modified with acetone solution of polyethylene glycol adipate sorbent such that mass of sorbent after removal of solvent were 10-30 μg. Recording of analytical signal is accomplished in the form of response of modified electrodes of piezoquartz resonator 15 sec after introduction of sample into detection cell. Calculation of acetic acid concentration is performed according to equation of calibration curve: ΔF = 1.4C_M, where ΔF is response of modified electrodes of piezoquartz resonator, Hz, and C_M is acetic acid concentration is air sample, mg/m³. Advantages of method are following: excluded sample preparation stage; reduced assessment time from 7-9 h to 0-45 min (taking into account time used for modifying electrodes and subsequent regeneration of detection cell); increased number of assessments without replacement of sorbent; reduced sorbent restoration time; and reduced assessment error.

EFFECT: accelerated assessment and increased assessment accuracy.

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