紫外分光光度法测定蔬菜中硝酸盐含量

Determination of nitrate in the vegetable by ultroriolet spectroscope

基于硝酸盐在207．38nm处有强烈吸收，且干扰少，在pH=7中性条件下，建立了用紫外分光光度法测定蔬菜中的硝酸盐含量的方法。此法测定的结果表明回收率在95．1％～100．9％之间，相对标准偏差为1．55％～4．14％。操作方法简便．适用于蔬菜中的硝酸盐含量的测定。

The new method to the determination of nitrate in the vegetable was established by ultraviolet spectroscope at pH = 7 on the basis of strong absorption of nitrate at 207.38 nm and little interference of some ions. The recovery of the determination method varied from 95.1% to 100.9%. Detection limit was 1.55% to 4.14%. The method was suitable for the determination of the different content nitrate in the vegetable.