环境水样中碘的流动注射化学发光分析方法

A Novel Flow Injection Chemiluminescence Method for Iodide Determination in Environmental Water Samples

在酸性条件下,高锰酸钾氧化吡罗红B产生化学发光,I-的加入对该体系的化学发光有显著的增强作用,据此建立了流动注射化学发光法测定环境水样中I-的新方法.在优化的实验条件下,I-的质量浓度在8.0×10-4～1.0×10-1μg/mL范围内与发光强度呈良好的线性关系,检出限为1.6×10-4μg/mL.对0.1μg/mL I-标准溶液进行11次平行测定,相对标准偏差为0.87%.将本法应用于环境水样中I-的测定,取得满意结果.

A new flow injection chemiluminescence （CL） method for the determination of iodide is described, which is based on the enhancement effect of iodide on the weak emission produced by potassium permanganate oxidation on pyronine flow injection analysis; chemiluminescence; iodide; potassium permanganate; pyronine B in acidic media. In the optimum conditions, CL intensities are proportional to the concentrations of iodide over the range 8.0× 10 4-1.0×10-1 μg/mL with a detection limit of 1.6×10 4 μg/mL. The relative standard deviation （RSD） is 0.87 % for 0.1 μg/mL iodide （n=11）. The method has been applied to the determination of iodide in water samples with satisfactory results.