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《Chemical Engineer》 2004-01
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Determination of trace zinc in metal plating wastewater by spectrophotometryusing the 5-Br-PADAP and the Emolsifier OP

CHEN Bing-he,FU Chun-xia(Department of Applied Chemistry,Changzhou College of Engineering Technology,Changzhou 213004,China)  
This paper explores chromogenic conditions of determining trace zinc in metal plating wastewater by spectrophotometry using the 5-Br-PADAP and the emolsifier OP.The experiment indicates that the amaranthine three-element complex compound generated by zinc,5-Br-PADAP and emolsifier OP submits the Beer-Lambert law in the scope of 0~24μg/50mL under the condition of pH 7.5~10.0 of boracic acid-sodium borate buffer solution.The three-element complex compound's λ max =552nm,and ε 552 =1.3×105L/(mol.cm).Its complexing ratio=1:2.This measuring method is of high sensitivity,of good accuracy,of portable quickness and safe operation.
【CateGory Index】: O657.3
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