水中微量锑(Ⅲ)的阻抑动力学光度测定法

Determination of Trace Antimony(Ⅲ)by Inhibitory Kinetic Spectrophotornetry

目的建立一种新的测定环境水样中微量锑的方法。方法在pH=10.50的NH3-NH4Cl缓冲溶液中,微量Sb3+对H2O2氧化硫堇的褪色反应具有强烈的阻抑作用,据此建立微量Sb3+的阻抑动力学光度测定法。结果该方法的线性范围为0.004～0.40μg/ml,r=0.9992,检出限为1.71×10-3μg/ml,RSD为1.4%～2.1%,回收率为96.2%～101.9%。结论该方法灵敏度高,操作简便快速,用于环境水样中微量锑的测定结果满意。

Objective To establish a new inhibitory kinetic spectrophotometric method for the determination of trace Sb3＋in water sample. Methods A new inhibitory kinetic spectrophotometric method for the determination of trace Sb3＋ was established based on the inhibitory effect of Sb3＋ on the oxidation of thionine by H2O2 in a buffer solution of NH3-NH4Cl at pH=10.50. Results The linear range of this method was 0.004-0.40 μg/ml, r=0.999 2, the limit of detection was 1.71 × 10-3 μg/ml, and RSDs were 1.4%- 2.1%, the recovery rates were 96.2%-101.9%. Conclusion This method is accurate, fast, simple and applicable to the determination of antimony content in environment water samples.