Biomonitoring

The ACGIH recommends several biological exposure indices to monitor exposure to tetrachloroethylene (see Table 20.1). The majority of absorbed tetrachloroethylene is excreted unchanged through the lungs and only a small percentage is metabolised.

Table 20.1 Biological exposure indices for tetrachloroethylene (ACGIH, 2000)

Determinant

Sampling time

BEI

tetrachloroethylene in end-exhaled air

prior to last shift of work week

5 ppm

tetrachloroethylene in blood

prior to last shift of work week

0.5 mg/l

trichloroacetic acid in urine

end of shift at end of work week

3.5 mg/l

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