聚乙烯醇存在下分光光度法测定锶的含量  

Spectrophotometric determination of content of strontium in the presence of polyvinylalcohol

作　　者：李晓东[1] LI Xiaodong(Key Laboratory of Songliao Aquatic Environment, Ministry of Education,Jilin Jianzhu University, Changchun 130118, China)

机构地区：[1]吉林建筑大学松辽流域水环境教育部重点实验室,长春130118

出　　处：《中国科技论文》2018年第6期675-678,共4页China Sciencepaper

基　　金：吉林省教育厅"十三五"科学技术项目(JJKH20170234KJ)

摘　　要：为研究聚乙烯醇-偶氮胂-Ⅲ-Sr2+体系的性质,建立了该显色体系的最佳条件。研究发现在适量聚乙烯醇表面活性剂存在的条件下,在pH=10.5的氨-氯化铵介质中,Sr2+与偶氮胂-Ⅲ形成摩尔比为1∶2紫色络合物。该络合物的最大吸收波长位于574nm处,在该波长处Sr2+在质量浓度为0~2.5μg/mL范围内遵守比尔定律,其线性回归方程为A=0.217 4C-0.000 4(C:锶浓度),相关系数r=0.999 1,方法表观摩尔吸光系数为ε574=1.90×104 L/mol/cm,方法检出限为0.073μg/mL。本方法可用于化学试剂氯化钾及雨水样品中锶的测定,13次测定相对标准偏差为2.32%~2.89%,加标回收率为99.8%~100.2%,样品分析结果与对照法中的原子吸收光谱相一致。The purpvse of this paper is to study the properties of polyrinylalcohol-Ⅲ-S2＋rsystem and establish the optimum conditions of the wlor system.The study found that in the presence of appropriate amount of polyvinylalcohol surfactant,in the NH3-NH4 Cl buffer medium of pH=10.5,Sr2＋and arsenazo-Ⅲform a purple complex with a molar ratio of 1∶2.The maximum absorption wavelength of the complex locates at 574 nm.Beer＇s law is obeyed over the concentration range of 0-2.5μg/mL of Sr2＋,and its linear regression equation is：A=0.217 4 C-0.000 4（C：strontium concentration）,with a regression coefficient of0.999 1 at this wavelength.The apparent molar absorption coefficient of method isε574= 1.90×104 L/mol/cm.Detection limit of the method is 0.073μg/mL.This method has been used for the determination of strontium in chemical reagent potassium chloride and rain water samples.The relative standard deviation of thirteen determinations was 2.32%-2.89% and the standard addition recovery was 99.8%-100.2%.The analytical results of samples were in agreement with the atomic absorption spectrometric ones.

关 键 词：分析化学 锶 分光光度法 偶氮胂-Ⅲ 聚乙烯醇 氯化钾 雨水 

分 类 号：O657.3[理学—分析化学]