硫化氢现场半定量检测方法研究

Study on on-site semi-quantitative determination of hydrogen sulfide

[目的]基于硝酸银比色法建立一种准确、简易可行的硫化氢现场半定量检测方法。[方法]在采样点用一支装有10.0 mL硫化氢吸收液的多孔玻板吸收管,以0.5 L/min流量采集5 min空气样品。现场取5.0 mL吸收液用硝酸银显色剂快速显色,与阳性对照试剂和阴性对照试剂进行目视比色。[结果]方法的半定量结果准确,最低检出浓度为1.6 mg/m3,相对标准偏差为3.2%。常见的无机阴离子对结果不产生干扰。[结论]本方法经济成本低,简易可行,现场测定结果与实验室检测结果量值溯源统一,适用于隐匿性硫化氢的现场调查。

[Objective]To establish a simply practicable semi-quantitative detection method of hydrogen sulfide based on silver nitrate colorimetry.[Methods]At the sampling site,a multi-hole absorbing tube containing 10.0 mL hydrogen sulfide absorbing solution was used to collect air sample for 5 minutes at 0.5 L/min sampling flow.Then,5.0 mL absorbing solution was rapidly colored with silver nitrate and the color was visual colorimetric determined,compared with both positive and negative control reagent.[Results]The method showed that the semi-quantitative determination results were accurate,with detection limit 1.6 mg/m3 and relative standard deviation(RSD)3.2%.The common inorganic anions had no interference.[Conclusion]This method is low cost,convenient,simple,and applicable for the investigation of hidden hydrogen sulfide.