摘要
在 pH9 5条件下 ,痕量Mn(II)、Fe(III)、Cu(II)和Zn(II)与2 -(5 -溴 -2 -吡啶偶氮) -5 -二乙氨基苯酚和聚乙二醇辛基苯基醚能发生很灵敏的显色反应 ,但所形成的三元胶束络合物的吸收光谱严重重叠。为了解决吸收光谱重叠的问题 ,本文利用分光光度法和化学计量学方法 ,用迭代目标转换因子分析法和模拟退火 -误差反向传播人工神经网络算法 ,定量测定了模拟样和谷物中的上述四种痕量组分。
Highly sensitive color reaction will take place when trace Mn(Ⅱ),Fe(Ⅲ),Cu(Ⅱ) and Zn(Ⅱ) react with 2_(5_bromo_2_pyridylazo)_5_diethylaminophenol and p_octylpolyethylenelycol phenylether at pH9.5, but the absorption spectra of the resulting ternary micelle complex overlap seriously. In order to solve this problem, a method combining spectrophotometry with chemometrics techniques was used. Trace Mn,Fe, Cu and Zn in grains were successfully determined simultaneously by spectrophotometry supported by iterative target transformation factor analysis algorithm and simulated annealing_error back propagation artificial neural network algorithm. The accuracy and precision of the results are satisfactory.
出处
《分析仪器》
CAS
2002年第1期23-26,共4页
Analytical Instrumentation
基金
国家商检局科学基金 (K9801 )
江苏省自然科学基金资助项目 (41042 )
