摘要
在酸性介质中，过量Ｆｅ（Ⅱ）存在下，Ｍｎ（Ⅶ）被完全还原为Ｍｎ（Ⅱ），余下的Ｆｅ（Ⅱ）与邻二氮菲生成桔红色的络合物，溶液的颜色随Ｍｎ（Ⅶ）量的增加而呈线性降低，借此建立了吸光光度间接测定Ｍｎ的方法，提高了灵敏度。在５１０ｎｍ处测量，其表观摩尔吸光系数为４６×１０４Ｌ·ｍｏｌ－１·ｃｍ－１，Ｍｎ（Ⅶ）的质量浓度在０～０８ｍｇ／Ｌ时服从比尔定律。方法用于测定一些岩石中的Ｍｎ时。
In the presence of excess Fe(Ⅱ) and in acid medium, Mn(Ⅶ) is reduced completely to Mn(Ⅱ). The remaining Fe(Ⅱ) reacts with 1 10 phenanthroline and forms an orange red complex in HAc NaAc(pH 4.6). The chromogenic reaction is inversely proportional to the amount of manganese. The maximum absorption is at 510 nm and apparent molar absorptivity is 4.6×10 4 L·mol -1 ·cm -1 . Beers law is obeyed in a range of 0～0.8 mg/L for manganese(Ⅶ). The method has been satisfactorily applied to the determination of trace manganese in rocks.
出处
《岩矿测试》
CAS
CSCD
北大核心
1996年第3期232-234,共3页
Rock and Mineral Analysis
关键词
锰
吸光光度法
岩石
manganese, spectrophotometric method, rock
