空气中铅的双硫腙水相增溶分光光度测定法

Rapid Determination of Lead in Air by Water Phase Solubilization Dithizone Photometry

目的建立空气中铅的双硫腙水相增溶光度快速测定方法。方法采用Tween20作增溶剂,双硫腙水相直接光度法测定空气中铅的含量。结果该方法的线性范围为1.0～100mg/L,r≥0.999,RSD为1.36%～9.57%,回收率为97.4%～98.3%,最低检出浓度为0.003mg/m3,与双硫腙比色法比较,其结果差异无统计学意义。结论该方法快捷,结果准确,灵敏度高,适合空气中铅的测定。

Objective To establish a method for rapid determination of the lead in air by water phase of solubilisation dithizone photometry. Methods The lead in air was determined by water phase solubilisation dithizone photometry with Tween20 as the solubilizer. Results The linear range was 1.0-100 mg/L（r≥0.999）, RSDs were 1.36%-9.57%, the recovery rates were 97.4%-98.3%, the lowest detected concentration was 0.003 mg/m^3. There was no significant difference between the result of this method and that of colorimetry. Conclusion The method was rapid, accurate and sensitive, this method is suitable for rapid determination of lead in the air.