摘要
基于亚硝酸根对溴酸钾氧化喹哪啶红的催化作用，建立了双波长分光光度动力学测定痕量亚硝酸根的新方法。于４００ ｎｍ测定吸光度△Ａ１，５１０ ｎｍ测定吸光度△Ａ２，以△Ａ＝△Ａ１＋△Ａ２定量。线性范围０．００４～０．１５ ｍｇ／Ｌ；检出限０．００４ ｍｇ／Ｌ０、方法简便，灵敏，准确，选择性好。用于水及蔬菜样品中痕量亚硝酸根的测定，结果满意。
A new dual-wavelength kinetic spectrophotometric method for the determination of trace nitrite is described. The method is based on a new indicator reaction of nitrite catalyzed oxidation of quinaldine red by potassium bromate. The reaction is monitored spec- trophotometrically by measuring the absorbance increase at 400 nm(△A1) and the absorbance decrease at 510 nm (△A2). Nitrite is determined according to △A=△A1 + △A2. The linear range for nitrite is 0. 004-0. 15 mg/L. The determination limit is 0. 004 mg/L. The method is of high sensitivity, selectivity, accuracy and simplicity. The method has been applied to the determination of trace nitrite in water and vegetable samples with satisfactory results.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1997年第7期814-817,共4页
Chinese Journal of Analytical Chemistry
