摘要
在酸性介质中,次甲基蓝与亚硝酸根发生亚硝化反应,本文选用0.08mol/l的盐酸,其亚硝化产物在—0.65V(us.SCE)附近产生一灵敏的极谱波,亚硝酸根浓度在0.002—0.24ug/ml范围内与二次导数波高成直线关系,本法用于水样和蔬菜中亚硝酸根的测定,选择性好。
A fairly selective and simple method for the determination of trace nitrate in acidic medium by polarography is developed. The behaviour of polarographic wave of methylene blue and its nitro-sation product in acidic medium have been studied.The peak potential of polarographic wave of nitrosation product is -0.65V (vs. SCE). The peak height is proportional to the concentration of nitrite in the range of 0.002-0.24ug/ml, this polarographic wave is an adsorption wave of nitrosation product. The method used has sen-sitivity(0.002ug/ml) and good selectivity .Most of the common ions show no or little effect on the determination, and this method has been used to determine nitrite in water and vegetables by single sweep oscillopolarography which was found to be simple and rapid.
出处
《环境化学》
CAS
CSCD
北大核心
1992年第5期77-80,共4页
Environmental Chemistry
