【摘要】 研究了新显色剂2(2咪唑偶氮)5二乙氨基酚(简称IZAPN)与Fe3+的显色反应的条件。结果表明,Fe3+在pH5的HAc-NaAc缓冲溶液中与IZAPN形成稳定的组成比为1:3的紫色络合物,λmax=590nm,试剂的λmax=405nm,对比度Δλ=185nm,其表观摩尔吸光系数ε=356×104,Fe3+在0～08mg/L范围内服从比尔定律,所拟方法用于纯铝和铝合金标样中微量铁的测定,加标回收率为1003%～1006%,RSD(n=6)在16%～39%,结果满意。更多还原

【Abstract】 In this paper, the condition of color reaction of a new reagent 2-(2-imidazolylazo)-5-diethylamino phenol(IZAPN) with Fe 3+ is reported. Results show that the IZAPN reacts with Fe 3+ to form a stable purple complex(1∶3) in the buffer solution of HAc-NaAc(pH5 0).The wavelength of absorption maximum and the apparent molar absorptivity are 590nm and 3 56×10 4L·mol -1 ·cm -1 , respectively. Beer’s law is obeyed in the range of 0-0 8mgFe 3+ /L. The method has been applied to the direct determination of iron in pure aluminium and aluminium alloy with satisfactory results. The recovery of standard addition is 100 3%-100 6% with precision of 1 6%-3 9% RSD(n=6).更多还原