[Determining trichloroacetic acid in the urine by the gas chromatography method]

It has been found that the method of determination of trichloroacetic acid in urine after Monster and Boersma due to high detectability and specificity may be used for determination of trichloroacetic acid (TCA) in urine particularly when aimed at evaluation of exposure to tetrachloroethylene (PERC) or to trichloroethylene (TRI) et low concentrations range. The improvement of determinations precision has been obtained by introduction of internal standard. In case of application of full procedure for trichloroacetic acid solutions in urine ranging from 1.0 to 15.0 mg/1, the relative standard deviation amounted to: sr = 0.063 (n = 21).