[三波长分光光度法测定痕量亚硝酸盐及反应机理]
[Determination of trace amounts of nitrite and reaction mechanism by triple-wavelength spectrophotometry].
作者信息
Zi Y, Chen L, Li Y
机构信息
Department of Chemistry, Huaibei Coal Teachers College, 235000 Huaibei.
出版信息
Guang Pu Xue Yu Guang Pu Fen Xi. 2000 Jun;20(3):437-9.
A new method was proposed for the determination of nitrite ion by triple-wavelength spectrophotometry. This limits ranges of determination are 0-0.560 mg.L-1 nitrite ion at 599.1 nm, 420.6 nm and 283.4 nm. It has been applied to analysis trace amounts of nitrite ion of standard sample and environmental water with satisfactory result, the relative error was less 1.7% and recovery of the real samples was between 96.5 and 100.0%. This method is based on the diazotization-coupling react of thionine with nitrite ion in acidic medium, the mole ratio of thionine:nitrite is 2:1 by the continuous variation and mole ratio method.
提出了一种用三波长分光光度法测定亚硝酸根离子的新方法。该方法在599.1 nm、420.6 nm和283.4 nm波长下测定亚硝酸根离子的线性范围为0～0.560 mg·L⁻¹。该方法已应用于标准样品和环境水样中亚硝酸根离子的痕量分析，结果令人满意，相对误差小于1.7%，实际样品的回收率在96.5%至100.0%之间。该方法基于在酸性介质中，硫堇与亚硝酸根离子的重氮化偶合反应，通过连续变化法和摩尔比法确定硫堇与亚硝酸根的摩尔比为2∶1。
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