摘要
本文研究了亚硝酸根的一个新指示反应，在稀磷酸溶液中，孔雀绿与溴酸钾的氧化还原反应受亚硝酸根催化使前者褪色，据此建立了测定痕量亚硝酸的新方法。测定灵敏度为６．８７×１０￣（－８）ｇＮ／Ｌ，测定范围为每２５ｍＬ０～６。
A new indicator reaction is described in which malachite green is oxidized to dis-colouration by potassium bromate,and nitrite is used as catalyst.The effect of various experj-mental factors was Studied and the optimal conditions for nitrite determination were found.Ithas been shown that the reaction follows the rate expression:Thevalues of u and βwere determined spectrophotomeerically and found to be l. 020 and 0.9919,respectively. From the Arrhenius plot,the apparcnt activation energy of the reaction wasfound to be 93. 65kJ/mol. The scnsitivity of 6.87×10￣(-8)g/L for N.was obtained in theconcentration range of 0 to 600 ng/25mL.
出处
《南昌大学学报（理科版）》
CAS
1995年第1期1-6,共6页
Journal of Nanchang University(Natural Science)
关键词
亚硝酸根
孔雀绿
溴酸钾
催化动力学
比色法
nitrite,catalytic kinetic specrophotometry,malachite green,potassium bromate
