利用压电频移法测定水中的痕量亚硝酸盐  

Microdetermination of Nitrite in Water With a Piezoelectric Crystal Detector

作　　者：高志强[1] 蔡青云[2] 姚守拙[2] 

机构地区：[1]重庆师范高等专科学校化学系,永川402168 [2]湖南大学化学化工学院,长沙410082

出　　处：《分析化学》1998年第2期177-179,共3页Chinese Journal of Analytical Chemistry

摘　　要：提出了利用压电频移法测定亚硝酸盐的方法。方法以碘离子与亚硝酸根之间的氧 化还原反应为依据，通过测定由反应生成的碘所引起的压电晶体频率的变化，在被萃取水相 中亚硝酸盐浓度为０．００９～２．３ ｍｇ／Ｌ范围内，频移值与浓度成正比：△Ｆ＝５．８＋２．５×１０３Ｃ （ｍｇ／Ｌ），ｒ＝０．９９０１。方法简便，用于天然水中亚硝酸盐的测定，结果令人满意。In this paper,a piezoelectric method is proposed for the micro-determination of ni- trite. The method is based on the redox reaction of nitrite with iodide the iodine produced from the reaction was extracted by CCl4, and the frequency change of the piezoelectric crystal caused by the inborned iodine was measured, then NO2 can be detemined indirectly. The lin- ear response can be obtained with in the concentration of 2 × 10-7-5 × 10-5 mol/L NO2 and the regression equation is △F(Hz) = 5. 80+11. 5 × 107C(mol/L), with the correlation coeffi- cient of 0. 9901. The method is very simple and it has been applied to determine nitrite in natural water.

关 键 词：亚硝酸盐 压电晶体 痕量测定 天然水 压电频移法 

分 类 号：O613.61[理学—无机化学] X832.02[理学—化学]