[Evaluation of the determination of hydrogen sulfide in the air of workplace by the detection tube method].

Objective: To evaluate the accuracy and applicability of detection tube method for quantitative detection of hydrogen sulfide in workplace air. Methods: In September 2021, the lower limit of quantification, accuracy, precision, environmental factors, interfering gases and other performance indicators of the method for determining hydrogen sulfide in the air of workplace were verified by the detection tube, and the results were compared with those of GB 11742-89 "Standard method for hygienic examination of hydrogen sulfide in air of residential areas-methylene blue spectrophotometric method" to evaluate the application effect of the detection tube method for quantitative detection of hydrogen sulfide in workplace air. Results: There was no significant difference in the results of 2.83 mg/m(3), 4.25 mg/m(3) and 17.00 mg/m(3) hydrogen sulfide concentration between the two methods (P>0.05) , but there was significant difference in the results of 8.50 mg/m(3) concentration (P<0.05) . The lower limit of quantification of hydrogen sulfide in workplace air was 2.83 mg/m(3), the accuracy was 96.0%-111.0%, and the precision was 0.70%-6.64%. Under the condition of 4 ℃, the measured results decreased by 3.39%-13.10%. When the humidity was 50%-80%, the relative error of the average measured value was -1.67%-4.44%. Interference gases that may exist in the workplace (including carbon dioxide, carbon monoxide, mercaptans, nitrogen oxides, sulfur dioxide, etc.) did not interfere with the results of the test tube. Conclusion: The accuracy and precision of the detection tube method meet the detection requirements. The method is simple, rapid and easy to be popularized, and can be used for the rapid detection of hydrogen sulfide gas concentration in the workplace.目的： 评价检测管法在工作场所空气中定量检测硫化氢的准确性和适用性。 方法： 于2021年9月，对检测管测定工作场所空气中硫化氢方法的定量下限、准确度、精密度、环境因素、干扰气体等性能指标进行验证，并与GB 11742-89《居住区大气中硫化氢卫生检验标准方法亚甲蓝分光光度法》测定结果进行比较，评价检测管法在工作场所空气中定量检测硫化氢的应用效果。 结果： 两种方法测定2.83、4.25和17.00 mg/m(3)硫化氢浓度的结果差异均无统计学意义（P>0.05），8.50 mg/m(3)浓度的结果差异有统计学意义（P<0.05）。检测管法测定工作场所空气中硫化氢的定量下限为2.83 mg/m(3)，准确度为96.0%~111.0%，精密度为0.70%~6.64%。在温度4 ℃条件下，测定结果下降3.39%~13.10%；在湿度50%~80%条件下，测定值的平均值相对误差为-1.67%~4.44%。工作场所中可能存在的干扰气体（包括二氧化碳、一氧化碳、硫醇类、氮氧化物、二氧化硫等）对检测管的测定结果不产生干扰。 结论： 检测管法准确度、精密度均满足检测要求，方法简单、快速、易于推广，可用于工作场所中硫化氢气体浓度的快速检测。.