摘要
提出以钼酸铵为显色剂，对甲替氨基酚-亚硫酸钠为还原剂，反向流动注射分光光度法测定水样中硅。对流动注射的技术条件进行了优化，结果为：以硫酸-草酸作为参比液，进样环体积为250μL，混合试样和进行反应的反应圈长度均为3m，试样溶液流速为0．85mL／min，参比液、显色液和还原剂的流速均为0．40mL／min。优化试验条件下，得到良好的校准曲线，线性范围25～1500ug／L，检测限为21．3ug／L。对200ug／L的Si（Ⅳ）标准溶液进行16次平行测定，得到相对标准偏差为2．2％。方法用于水样中硅的测定，加标回收率为95％～105％。
The determination of silicon in water by reverse flow injection spectrophotometry was developed using ammonium molybdate as color agent and methylaminophenol-sodium sulfite as reducing agent. The optimized technical conditions of flow injection were as follows： sulfuric acid-oxalic acid as reference solution; the sampling loop volume, 250μL; the lengths of reaction coils for mixing sample and carrying out reaction, both 3 m; the flow rate of sample solution, 0.85mL/min; the flow rate of reference solution, color agent and reducing agent, all 0.40 mL/min. Under these optimized experimental conditions, a good calibration curve could be obtained with the linear range of 25--1500 /_tg/L and detection limit of 21.3 μg/L. 200 μg/L Si （Ⅳ） standard solution was determined for 16 times, with the RSD of 2. 2 %. The recovery of standard addition for actual water sample was 95 %-- 105 %.
出处
《冶金分析》
CAS
CSCD
北大核心
2009年第2期65-68,共4页
Metallurgical Analysis
基金
国家863资助项目(2002AA639290)
关键词
反向流动注射分析
分光光度法
硅
参比液
reverse flow injection analysis
spectrophotometry
silicon
reference solution
