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本文研究了在氯化十六烷基呲啶(CPC)存在下,锑(111)与 O-NPF 的显色反应及其分析应用.试验表明,在0.1～0.32N HNO_3介质中,锑与 O-NPF 形成稳定的橙红色络合物,其最大吸收波长λ_(mαx)为520nm.络合物中 Sb∶O-NPF=1∶1.表观摩尔吸光系ε_(520)=9.81×10~4l·mol~(-1)·cm~(-1).锑含量在0～30ug/25ml 符合比尔定律.对一些常见离子的干扰及其消除进行了研究.所拟方法可不经分离,直接测定铜合金及金属材料中的微量锑,结果满意.
In this paper, the color reaction of antimony (111) with O-NPF and its analytical application in the presence of cetyl pyridinium chloride (CPC) have been studied.The results show that in the medium of 0.1-0.32 N HNO 3, -NPF formed a stable orange-red complex, the maximum absorption wavelength λ mαx was 520 nm, the molar ratio of Sb to O-NPF in the complex was 1: 1, the apparent molar absorptivity ε 520 was 9.81 × 10 ~ 4l · mol ~ (-1) · cm ~ (-1) .The Beer’s law was obeyed in the range of 0 ~ 30ug / 25ml.The interferences and elimination of some common ions were studied.The proposed method can be directly measured without separation Copper alloy and trace antimony metal materials, with satisfactory results.