Health control of workers using organic solvents Part I. A screening test (porcelain dish method) of urinary hippuric acid which was devised and applied to the urine of painting workers who were exposed to toluene as ingradient of thinner at their working shop

Analytical sensitivity of urinary HA screening method by porcelain dish is similar to that of direct colorimetric method and good agreement with both methods was obtained. Namely, eighteen samples out of twenty measured by screening method coincide with that of direct colorimetric method. Data indicate that this method is very useful for screening method having an advantage in which rapid determination at on the urinary HA as an index of toluene exposure.