Fig. 1A, B Typical HPLC charts designed to show chromatographic
quantification of toluene in urine. A A chromatogram to show the
peak of toluene in standard solution (858.2 lg./l acetonitrile-water);
retention time 19.78 min. B A chromatogram to show toluene
(54.6 lg./l acetonitrile-urine) in the urine of a toluene-exposed worker
(retention time 19.69 min)
contamination with toluene, especially at the time of urine sampling
(Kawai et al. 1996).
Statistical analysis
Simple regression analysis and Student's t-test (paired as indicated)
were employed for statistical evaluation.