表面活性剂增敏催化光度法测定痕量亚硝酸根  

Determination of Nitrite by Catalytic Kinetic Photometry with Surfactant Sensitizer

作　　者：张爱梅[1] 王术皓[1] 崔慧[1] 

机构地区：[1]聊城师范学院化学系,聊城252059

出　　处：《分析化学》2001年第2期202-204,共3页Chinese Journal of Analytical Chemistry

摘　　要：基于稀磷酸介质中，溴化十六烷基吡啶对亚硝酸根催化溴酸钾氧化吡啰红Ｂ褪色反应的增敏作用，建立了测定亚硝酸根的表面活性剂增敏催化动力学光度法。加入溴化十六烷基吡啶，灵敏度增大２．２倍。测量亚硝酸根的线性范围为０．００５～０．１５ｍｇ／Ｌ，检出限为０．００４ｍｇ／Ｌ。用于水及蔬菜中痕量亚硝酸根的测定，结果满意。A catalytic kinetic photometric method for the determination of nitrite with surfactant sensitizer has been developed. The method is based on the catalysis of NO2- to the discoloring reaction of pyronine B oxidized by potassium bromate in the solution of dilute H3PO4. When cetylpyridine bromide was used as a sensitizer of the reaction, the sensitivity increased by 2.5 times approximately. There was linear relationship of Ig(A(0)/A) with nitrite in the range 0.005 similar to 0.15 mg/L. The detection limit was 0.004 mg/L. The method was used in the determination of trace nitrite in water and vegetable samples with satisfactory results.

关 键 词：亚硝酸根 催化光度法 表面活性剂 吡罗红B 痕量分析 

分 类 号：O657.3[理学—分析化学]