SPECTROPHOTOMETRIC DETERMINATION OF NITROGEN-DIOXIDE (NITRITE)

被引：0

作者：

PARASHAR, DC

SINGH, M

SINGH, N

SARKAR, AK

机构：

[1] Analytical Chemistry Section, National Physical Laboratory, New Delhi - 110012, Dr K.S. Krishnan Road

来源：

ANALYTICAL LETTERS | 1993年 / 26卷 / 05期

关键词：

UV SPECTROPHOTOMETER; NITRITE; PERMANGANIC ACID;

D O I：

10.1080/00032719308019878

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A highly sensitive spectrophotometric method has been developed for the determination of nitrogen dioxide (nitrite as NO2-) by reacting manganese dioxide in 1:20 perchloric acid. An amount of manganese dioxide (MnO2) equivalent to the concentration of nitrogen dioxide becomes soluble due to the reduction of Mn (IV) to Mn (II) by nitrite in acidic medium. The soluble Mn (II) ion is filtered to remove excess of MnO2 and is oxidized to permanganate ion by periodic acid in presence of phosphoric acid. The violet colored solution shows maximum absorbance at 525 nm. The sensitivity of the method is 0.08 ppm based on 0.0044 absorbance, and Beer's law is obeyed in the concentration range of 0.2 to 10.0 mug/mL of NO2-. Molar absorbance is found to be 2442 at 525 nm.

引用

页码：959 / 963

页数：5