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G.F.Smith和W.H.Mecurdy最先提出以新亚铜灵(NCP)吸光光度法测定铜,具有很高的选择性,至今仍然普遍采用,但该方法的灵敏度不高(ε=7950l·mol~(-1)·cm~(-1)),不适用于微量铜的测定。1976年石田良荣等提出了Cu(Ⅱ)、NCP和CAS在水相中形成离子缔合物测定铜的方法,此法灵敏度虽然较高(ε=5.86×10~4l·mol~(-1)·cm~(-1)),但因许多金属离子产生干扰,且不易消除,因而选择性较差,该文也没有提及对实际样品的分析。测定铜的其他方法已有综述,但灵敏度都不高,而且选择性较差。本文基于在弱酸性条件下,首先用氯仿萃取Cu(Ⅰ)—NCP的螯合物,然后在分离出的氯仿层中,加入盐酸羟胺、CAS和缓冲溶液,在弱碱性条件下,再进行萃取,此时在有
GFSmith and WHMecurdy first proposed the new copper (NCP) spectrophotometric determination of copper, with high selectivity, is still widely used, but the sensitivity of the method is not high (ε = 7950l · mol ~ (- 1) · cm -1), is not suitable for the determination of trace amounts of copper. In 1976 Ishida Liang et al proposed Cu (Ⅱ), NCP and CAS in the aqueous phase of the formation of ion-association determination of copper, although the sensitivity of this method is relatively high (ε = 5.86 × 10 ~ 4l · mol -1 ) · Cm -1), but the selectivity is poor because many metal ions interfere with each other and are not easily eliminated. This article also does not mention the analysis of actual samples. Other methods of measuring copper have been reviewed, but the sensitivity is not high and the selectivity is poor. In this paper, based on the weak acid conditions, first with chloroform extraction Cu (Ⅰ) -NCP chelate, and then in the chloroform layer separation, adding hydroxylamine hydrochloride, CAS and buffer solution, in the weak alkaline conditions, and then Extraction, at this time there