铁-磺基水杨酸-二甲氧基羟基苯基荧光酮-Triton X-100体系的光度研究及应用

Study on Multicomponent Complex of\=FeSulphosalicylic AcidDMHPFTritonX100\=by Spectrophotometric Method and\=Its Analytical Application

研究了在表面活性剂存在下，铁与新显色剂二甲氧基羟基苯基荧光酮（ＤＭＨＰＦ）的显色反应。在ｐＨ９．０～１０．５的氨性介质中，有磺基水杨酸（Ｓａｌ）存在下，形成Ｆｅ３＋ＳａｌＤＭＨＰＦＴｒｉｔｏｎＸ１００四元混配配合物，其最大吸收峰在５９０ｎｍ，测定波长选择６１０ｎｍ，表观摩尔吸光系数分别为１．３×１０５Ｌ·ｍｏｌ－１·ｃｍ－１和９．４×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。配合物组成比ｎＦｅ３＋∶ｎＤＭＨＰＦ＝１∶２，Ｆｅ３＋的质量浓度为０～６００μｇ／Ｌ时符合比尔定律。以直接光度法测定工业硅和石灰石样品中微量铁，结果与标准值相符，５次测定的ＲＳＤ在０．６４％～２．４１％。

The color reaction of Fe3+ with a new chromogenic agent dimethoxyhydroxyphenylflurone (DMHPF) has been investigated in presence of surfactants. The Fe3+SalDMHPFTritonX100 quaternary complex is formed in the medium of NH3H2O at pH 9.010.5 in presence of sulphosalicylic acid(Sal). The maximum absorption is at 590 nm, measuring wavelength is at 610 nm with apparent molar absorptivity of 1.3105 Lmol-1cm-1 and 9.4104 Lmol-1cm-1 respectively. The molar ratio of Fe3+ and DMHPF (nFe3+nDMHPF) is 12. Beers law is obeyed in the range of 0600 g/L for Fe3+. The method has been applied to the directly spectrophotometric determination of trace Fe3+ in industrial silicon and limestone. The results are in agreement with certified values with precision of 0.64% to 2.41% RSD(n=5).\=\=