【摘要】 建立了以1_[（5_溴2吡啶 ）偶氮]₂,7_萘二酚 （5_Br_PADN）为显色剂 ,TritonX₁00为增溶增敏剂 ,用非线性偏最小二乘 （NLPLS） -分光光度法同时测定Cu2 +、Ni2 +、Zn2 +的方法。用迭代偏最小二乘法 （IPLS）选择测定波长 ,用自编的MATLAB计算机程序进行处理。结果表明 ,该法不仅克服了三组分之间的相互干扰 ,而且较好地解决了非线性问题。所拟方法用于人工样品的分析 ,准确度较好 ,结果令人满意更多还原

【Abstract】 The optimum conditions of the colour reaction of copper, nickel and zinc with 1 [（5 bromo 2 pyridyl） azo] 2,7 dihydroxy naphthalene（5 Br PADN） have been established in the presence of the sensitizer/solubilizer Triton X ₁00. The proposed method can be applied for the simultaneous spectrophotometric determination of these three elements with the aid of nonlinear partial least square technique（NLPLS）. The selection of optimal wavelength was achieved by using the iterative partial least square method（IPLS）. An algorithm MATLAB compiled by the authors gave satisfactory results for synthetic samples, indicating that the method not only overcomes interference among the three elements, but also solves the nonlinear problem between absorptivity and concentration.更多还原