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8.0~140μg.L-1,检出限为0.98μg.L-1,方法用于水样中亚硝酸根的测定,RSD为1.9%~3.1%。
In a dil H2SO4 solution, the oxidation of cresol red by KBrO3 was catalyzed by the presence of trace amounts of nitrite, leading to eolorfading of cresol red. Linear relationship between the magnitude of decrease in color intensity at 564 nm (△A=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%.
出处
《理化检验(化学分册)》
CAS
CSCD
北大核心
2007年第8期658-659,662,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
催化光度法
甲酚红
溴酸钾
亚稍酸根
Catalytic photometry
Cresol red
Potassium bromate
Nitrite ion