[Method for determining o-tolidine in workplace air by gas chromatography].
OBJECTIVE
To establish a method for determining o-tolidine in workplace air by gas chromatography.


METHODS
o-tolidine in workplace air was collected with a glass fiber filter, desorbed with methanol, and determined by gas chromatography-flame ionization detector.


RESULTS
The concentration of o-tolidine showed a linear relationship with peak area within 0.04∼9.00 µg/ml; the detection limit was 0.04 µg/ml; the minimum detectable concentration was 0.0002 mg/m(3) (calculated by 375 L air sample); the sampling efficiency was 93%∼100%; the elution efficiency was 94%∼96%; the relative standard deviation was 0.8-2.5%. Sample could be stored at 4 °C for at least 8 days and at room temperature for as long as 6 days.


CONCLUSIONS
This determination method meets the requirements of Guide for establishing occupational heath standards-Part 4 Determination methods of air chemicals in workplace (GBZ/T 210.4-2008) and is suitable for determination of o-tolidine in workplace air.
Nanjing Center for Disease Control and Prevention, Nanjing, Jiangsu 210003, China.
He-xia
HX
Zha
Hao
H
Zhao
Shi-quan
SQ
Zhao
D000388:Air / Q000032:analysis*; D000395:Air Pollutants, Occupational / Q000032:analysis*; D001560:Benzidines / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods*; D017132:Workplace
D000395:Air Pollutants, Occupational; D001560:Benzidines; C009501:2-tolidine