高灵敏显色光度法测定江水中痕量亚硝酸根  

Determination of trace nitrite in river water by high-sensitive chromogenic spectrophotometry

作　　者：罗道成[1] 易平贵[1] 刘小平[1] 

机构地区：[1]湘潭工学院环境工程与化工新技术研究所,湘潭411201

出　　处：《化学试剂》2003年第3期153-154,共2页Chemical Reagents

摘　　要：研究了在 pH1.0～ 2 .0盐酸介质中 ,亚硝酸根与对氨基苯乙酮 萘乙二胺反应形成可溶于水的紫红色染料 ,建立了一种测定痕量亚硝酸根的高灵敏显色光度法。方法的检出限为 2 .4 μg/L ,表观摩尔吸光系数为 2 .5 3× 10 5L·mol-1·cm-1,亚硝酸根的浓度在 0 .0～ 14 0 .0 μg/L范围内符合比尔定律。方法用于测定江水中痕量亚硝酸根 。In hydrochloric acid medium at pH1.0～2.0, nitrite reacts with p aminophenylnaphthyl ethylenediamine to form a purplish red dyestuff which can dissolve in water. A new high sensitive chromogenic spectrophotometric method for the determination of trace nitrite has been established. The detection limit of the method is 2.4μg/L ,the apparent molar absorptivity is 2.53×10 5 L·mol -1 ·cm -1 .Beer's law is obeyed in the concentration range of 0.0～140.0μg/L for nitrite. The method has been applied to the determination of trace nitrite in river water with satisfactory results.

关 键 词：亚硝酸根 对氨基苯乙酮-苯乙二胺 光度法 江水 水污染 亚硝酸盐 

分 类 号：X132[环境科学与工程—环境科学] X832