1999•Neimenggu Shi-da xuebao. Zhexue shehui kexue hanwen banRequires access

SPECTROPHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF MANGANESE WITH DBONPF

Lifen Liu

Abstract

The conditions of colour reaction of manganese(Ⅱ) with 4,5-dibromo-o-nitro phenyl fluorone(DBONPF) in the presence of CTMAB and Tween-80 were studied.It was found that manganese(Ⅱ) reacts with DBONPF in a medium of pH8.0～9.6 to form a 1∶2 complex with maximum absorption at 600nm.The molar absorptivity of the complex is 1.12×10 5 L·mol -1 ·cm -1 .Beers law is obeyed for manganese(Ⅱ) in the range of 0～200μg·L -1 .Trace amounts of manganese in tea have been determined by proposed method and the results obtained are satisfactory.

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Key concepts: Manganese, Molar absorptivity, Chemistry, Trace Amounts, Absorption (acoustics), Nuclear chemistry, Spectrophotometry, TRACE (psycholinguistics)