摘要
对氯胺T-四碱催化分光光度法测定碘的条件作了部分改进及进一步的优化。标准物质和样品以碳酸钠-氧化锌混合试剂分解,用醋酸中和溶液时生成的醋酸钠缓冲体系控制溶液酸度,以蓝色络合物的最大吸收峰计算结果。在选定条件下,方法选择性好,操作手续简便;检出限为0.15μg/g;经过近3万件样品、几百件国家标样考验,分析的准确度和精密度均能满足要求。
Based on the literatures, some improvement and further optimization for the catalytic spectrophotometric determination of trace iodine in agricultural geological survey samples in choloramine T-tetrabase system has been proposed. Both reference standards and samples are decomposed by Na2CO3-ZnO mixed flux. The acidity of solution is controlled in NaAc-HAc buffer system. The maximal absorption peak of the blue complex is measured. Under the optimized conditions the method provides good selectivity, simple operation and low detection limit of 0.15 μg/g for iodine. The method has been applied to the determination of trace iodine in over 30000 samples and hundreds of national standard samples with satisfactory results.
出处
《岩矿测试》
CAS
CSCD
2007年第5期391-394,共4页
Rock and Mineral Analysis
关键词
氯胺T-四碱体系
催化分光光度法
痕量碘
农业地质调查样品
choloramine T-tetrabase system
catalytic spectrophotometry
trace iodine
agricultural geological survey sample
