【摘要】 研究了新显色剂 2 -( 1 ,3 ,4 -三氮唑偶氮 ) -5-二乙氨基酚 (简称 TZAPN)与 Bi3+ 的显色反应的条件。结果表明 ,在p H7.0的 NH4Ac缓冲溶液中 ,TZAPN与铋形成稳定的红色配合物 ,λmax=53 0 nm,试剂的 λm ax为 4 3 0 nm,Δλ为 1 0 0 nm,配合比为 1∶ 2 ,其表观摩尔吸光系数为 6.2 9× 1 0 4L· mol- 1 · cm- 1 。Bi3+ 在 0～ 1 .6mg/L范围内服从比耳定律 ,在掩蔽剂作用下 ,可不经分离直接测定合金样品及工业废水中的铋 ,结果满意更多还原

【Abstract】 In this paper,the conditions of colour reaction of the new reagent 2 (1,3,4 triazolylazo) 5 diethylamino phenol with Bi 3+ are reported.Results show that the new colour reagent reacts with Bi 3+ to form a stable red complex (1∶2) in the presence of NH 4Ac at pH 7.0.The maximum absorption wavelength and apparent molar absorptivity are 530nm and 6.29×10 4 L·mol -1 ·cm -1 respectively.Beer′ s law is obeyed in the range of 0~1.6mg/L.The method has been applied to the direct determination of bismuth in practical samples with satisfactory results.更多还原