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用新合成的偶氮试剂2-(8′-羟基喹啉-5′-磺基-7′-偶氮)-1-羟基-8-氨基萘-3,6-二磺酸(HQSAH)研究了光度法测定Fe(Ⅲ)的反应条件。Fe(Ⅲ)与试剂在pH4.66(NaAc/HAc缓冲介质)时发生特效络合反应,络合物吸收峰716nm,ε为1.64×10~4L·mol~(-1)cm~(-1),络合比为1:2(M:R),线性范围为0～20μg/25ml,检测限为5.0ng/ml,考察了其它共存离子的干扰,发现除Al(Ⅲ)略有干扰外,其它常见离子均允许大量存在,该方法已直接应用于血样、矿祥和铝合金样中铁的分析,结果令人满意。
A new synthetic azo reagent 2- (8’-hydroxyquinoline-5’-sulfo-7’-azo) -1-hydroxy-8- aminonaphthalene-3,6-disulfonic acid (HQSAH) Spectrophotometric Determination of Fe (Ⅲ) Reaction Conditions. The specific complexation reaction of Fe (Ⅲ) with the reagent at pH4.66 (NaAc / HAc buffer medium) showed that the absorption peak of the complex was 716 nm and ε was 1.64 × 10 -4 L · mol -1 cm -1 ), The complex ratio was 1: 2 (M: R), the linear range was 0 ~ 20μg / 25ml and the detection limit was 5.0ng / ml. The interferences of other coexisting ions were also investigated. , Other common ions are allowed to exist in large quantities. This method has been applied to the analysis of iron samples, iron ore and aluminum alloy samples with satisfactory results.