NDLI: Determination of trace copper (II) in water samples by kinetic-spectrophotometry

Content Provider	Springer Nature Link
Author	Qi, Yanxia Ji, Hongwei Xin, Huizhen Liu, Li
Copyright Year	2007
Abstract	A new kinetic-spectrophotometric method is proposed for the determination of copper (II). The method is based on the catalytic effect of copper (II) on the oxidation of weak acid brilliant blue dye (RAWL) by hydrogen peroxide. The copper (II) can be determined spectrophotometrically by measuring the decrease of absorbance of RAWL at λ = 626 nm using the fix-time method. The optimum reaction conditions are as follows: pH 7.20, buffer solution NaOH-KH$_{2}$PO$_{4}$, RAWL (200 mg L$^{−1}$) 5.00 mL, H$_{2}$O$_{2}$ (30%) 0.50 mL, reaction temperature 80°C and reaction time 20 min. The linear range of this method is between 0 μgL$^{−1}$ and 12 μgL$^{−1}$ and the limit of detection is 0.011 μgL$^{−1}$, the relative standard deviation (RSD) in five replicate determinations for 2 and 8 μgL$^{−1}$ copper (II) are 3.2% and 2.3%, respectively. Twenty ions do not interfere in the determination of copper (II). The method has been applied satisfactorily to the determination of copper (II) in freshwater samples (tap water and Yellow River water from Lijin, Shandong, China) and seawater samples (from the South China Sea), the recovery rates are 98.0%, 102.5% and 96.0%, respectively.
Starting Page	143
Ending Page	146
Page Count	4
File Format	PDF
ISSN	16725182
Journal	Journal of Ocean University of China
Volume Number	6
Issue Number	2
e-ISSN	19935021
Language	English
Publisher	Science Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	copper kinetic-spectrophotometry catalytic effect weak acid brilliant blue dye (RAWL) Oceanography
Content Type	Text
Resource Type	Article
Subject	Oceanography Ocean Engineering

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