催化光度法测定痕量锰──Mn(Ⅱ)-NTA-AG-KIO_4体系

Catalytic Spectrophotometric determination of Trace Amounts of Manganese withPotassium Periodate-Alizalin Green-Nitrilo Triacetic Acid System

研究了在ｐＨ４．４ＨＡｃ－ＮａＡｃ缓冲介质中，锰（Ⅱ）催化高磺酸钾氧化茜素绿的褪色反应，建立了测定痕量锰的新催化光度法．方法的线性范围为０～３．２μｇ／Ｌ，检测网为７．４×１０－８ｇ／Ｌ，相对标准偏差ＲＳＤ＝０．９３％（ｎ＝１１）．用于铝合金中锰的测定，结果满意．

P A new catalytic spectrophotometirin for the detelmination of trace amounts of Mn (Ⅱ) has been deve-loped.The method is on the oxidation of alizalin green by potassium periodate in the presence of nitrilo triacetic acid asan activator.The relative standard deviation was 0.93% for 0.05ugMn (Ⅱ)/25mL (11 replicates).The limit of detection forMn is 7.4×10-8g/L. The method has been successfully applied to the datermination of Mn in aluminum alloy sample.