痕量亚硝酸根的光度测定——基于亚硝酸根对溴酸钾氧化甲酚红的催化作用
Photometric Determination of Trace Amounts of Nitrites Based on Its Catalytic Effect on the Oxidation of Cresol Red by Potassium Bromate
摘 要
研究了在稀硫酸介质中,亚硝酸根催化溴酸钾氧化甲酚红褪色反应的适宜条件和影响因素,建立了测定痕量亚硝酸根的方法.方法的线性范围为8.0~140 μg·L-1,检出限为0.98 μg·L-1,方法用于水样中亚硝酸根的测定,RSD为1.9%~3.1%.
甲酚红
溴酸钾
亚硝酸根
Catalytic photometry
Cresol red
Potassium bromate
Nitrite ion
Abstract
In a dil H2SO4 solution,the oxidation of cresol red by KBrO3 was catalyzed by the presence of trace amounts of nitrite,leading to colorfading of cresol red.Linear relationship between the magnitude of decrease in color intensity at 564 nm (ΔA=A0-A) and the concentration of nitrite ion was kept in the range of 8.0-140.0 μg·L-1,with detection limit of 0.98 μg·L-1.In its application to the determination of nitrite in 4 water samples from different sources,values of RSD′s (n=6) and recovery found were 1.9%-3.1%.
中图分类号 O657.31
所属栏目 工作简报
基金项目
收稿日期 2006/7/14
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备注王立霞(1968-),女,河北吴桥县人,实验师,主要方向为无机分析.
引用该论文: WANG Li-xia,WANG Yu. Photometric Determination of Trace Amounts of Nitrites Based on Its Catalytic Effect on the Oxidation of Cresol Red by Potassium Bromate[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(8): 658～659
王立霞,王瑜. 痕量亚硝酸根的光度测定——基于亚硝酸根对溴酸钾氧化甲酚红的催化作用[J]. 理化检验－化学分册, 2007, 43(8): 658～659
被引情况:
【1】吴慧庆,苏耀东,王敏, "流动注射-聚中性红膜修饰电极安培法测定痕量亚硝酸根",理化检验－化学分册 46, 232-234(2010)
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参考文献
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