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《Metallurgical Analysis》 2009-03
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Simultaneous determination of lead and zinc in copper concentrate by BP-artificial neural network spectrophotometry

YU Jian-zhong1,YU Kai-yan2,SHI Xiao-yan1,PENG Rui1(1.Tianjin Vocational Instituted,Tianjin 300402,China;2.College of Information Technical Science,Nankai Univercity,Tianjin 300071,China)  
Simultaneous determination of lead and zinc in copper concentrate by BP artificial neural network spectrophotometry was investigated without separation of matrix copper using 2-[(5-bromine-2-pyridine)-azo]-5-diethylaminophenol(5-Br-PADAP) as color reagent in the presence of TritonX-100 at pH 4.4.Triple feedforward antipropagation artificial neural network was used in this study.For the hidden layer,eight nodes were selected and the S-type nerve unit was adopted,whereas for the output layer,two nodes were selected and the linear nerve unit was adopted.The specified error range could be reached after 555 times of learning.Beer's law was obeyed in the mass concentration of 0-1.2 μg/mL and 0-1.4 μg/mL for lead and zinc.This method has been applied to the determination of lead and zinc in copper concentrate with the relative standard deviations of 0.8 % and 1.4 %,respectively and the recoveries for lead and zinc of 89.3 %-109.6 % and 99.2 %107.3 %.
【CateGory Index】: P575.4
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