[Study of sample collection and analysis methods for the hydrogenated terphenyl in workplace air].

OBJECTIVE

To establish solvent desorption gas chromatographic method for determination of hydrogenated terphenyl in workplace air.

METHODS

According to standards of methods for determination of toxic substances in workplace air, hydrogenated terphenyl in the air was first adsorbed by activated carbon, desorbed by carbon disulfide, and determined by gas chromatography, then quality was used with retention time and quantitation was used by the sums of peaks area.

RESULTS

The method presented linear relationship within the ranges of 6-60 microg/ml. The relative standard deviations (RSD) were 1.3%-2.0% and the detection limits were 1.2 microg/ml. The desorption efficiencies were 89.3%-95.4%. Sampling efficiencies were 100% and the breakthrough volumes were beyond 6.7 mg in a 100 mg active carbon with glass wool. The samples in active carbon tubes could be stored for 7 days at room temperature and its repetition was good. Other solvents in the air such as coexisting diphenyl, ortho-, meta-, para-terphenyls had no interferences in this method.

CONCLUSION

The method could meet with the requirements of Standards of methods for determination of toxic substances in workplace air and be feasible for determination of hydrogenated terphenyl in workplace air.