二氨基萘分光光度法测定饮用水中硒

Determination of Selenium in Drinking Water by Diaminonaphthalene Spectrophotometry

为建立测定饮用水中硒的分光光度法 ,研究了硒与二氨基萘反应产物的吸收光谱特性、共存离子干扰、测量范围、检出限、精密度和准确度。结果表明 :Se4+与 2 ,3-二氨基萘反应产物的最大吸收波长为 377nm,摩尔吸光系数 ε377=2 .7× 10 4L/ (mol·cm) ,检出限 0 .0 18μg,线性范围 0 .2～ 10 μg/ ml,回归方程 A=0 .0 77C+0 .0 14,相关系数 r=0 .9999,相对标准偏差小于 5 .47% ,回收率 96 .5 %～ 10 6 %。该方法具有简便、灵敏、准确等特点 。

To establish a spectrophotometric method for detecting selenium in drinking water,some subjects,such as the features of absorption spectrum of the reacting product of selenium and diaminonaphthalene,disturbance of other coexisting ions,detection range,detection limit, precision and accuracy were studied.The results showed that:the maximum absorption wavelength of the reacting product of Se 4+ and 2,3 diaminonaphthalene was 377 nm,the detection limit,molar absorptivity (ε 377 ) and linear range of this method was 0 018 μg/50 ml,2 7×10 4 L/(mol·cm)and 0 2~10 μg/50 ml respectively The regressive equation was A=0 077 C +0 014 with a correlation coefficient r value of 0 9999 The relative standard deviation ( RSD ) and recovery rate were <54 7% and 96 5%~106% respectively This method was simple, sensitive and accurate,could meet the requirement of the routine monitoring of selenium in drinking water