砷铈催化分光光度法测定尿碘两种消解方式的比较

Comparison of Two Digestion Methods for Urine Iodine Determined by Arsenic Cerium Catalytic Spectrophotometry

目的比较用砷铈催化分光光度法测定尿碘的两种消解方式。方法用多孔消化器(石墨导热方式)和水浴恒温振荡器(水浴导热方式)两种方法消解样品,用砷铈催化分光光度法测定尿中碘的含量。结果两种方法分别测定3种质量浓度的尿中碘国家标准物质,结果均符合允许误差要求。结论两种方法均适用于砷铈催化分光光度法测定尿中碘含量,但水浴恒温振荡器消解法更经济实用。

Objectives To compare the results of iodine in urine determined by arsenic cerium catalytic spectrophotometry with two different digestion methods. Methods Samples were digested with porous digester （graphite heat conduction） or thermostatic oscillator （water bath heat conduction）, and the contents of iodine in urine samples were determined by arsenic cerium catalytic spectrophotometry. Results The results of 3 standardized iodine solutions digested by two methods met the requirement of permissible error. Conclusions Both digestion methods were suitable for the detection of iodine in urine with arsenic cerium catalytic spectrophotometry, but thermostatic oscillator digestion method was more economical and practical.