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PAN[1-(2-吡啶偶氮)-2-萘酚]能与一些金属离子生成难溶于水的有色络合物。通常用有机溶剂萃取后再用分光光度法测定。近年来有人采用非离子型表面活性剂使“金属-PAN”络合物增溶于水中,从而简化了分析手续。我们将PAN与镉(Ⅱ)或铜(Ⅱ)生成的络合物用Triton X-100来增溶,pH保持在9.0～10.7及7.0～10.3之间,吸光度在两小时内稳定,最大吸收波长均在554毫微米处,克分子吸收系数分别为5.0×10~4及4.0×10~4。灵敏度为0.0023微克镉/厘米~2。0.0016微克铜/厘米~2。干扰离子可用掩蔽剂进行掩蔽。
PAN [1- (2-pyridylazo) -2-naphthol] can form a hardly water-soluble colored complex with some metal ions. It is usually determined by spectrophotometry after extraction with organic solvents. In recent years, nonionic surfactants have been used to solubilize “metal-PAN” complexes in water, simplifying analytical procedures. We solubilize the complexes of PAN with cadmium (Ⅱ) or copper (Ⅱ) with Triton X-100 at pH values of 9.0-10.7 and 7.0-10.3. The absorbance is stable within two hours. The maximum absorption wavelength Both at 554 nm, the molecular absorption coefficients were 5.0 × 10 -4 and 4.0 × 10 -4, respectively. Sensitivity of 0.0023 micrograms of cadmium / cm ~ 2.0.0016 micrograms of copper / cm ~ 2. Interfering ions can be masked with masking agents.