Determination of copper in river water by flow injection in alliance with H2O2-Sunset Yellow catalytic spectrophotometry
LI Hui1,WEI Liang2, ZHANG Xin-shen3, LI Hua1
1. Department of Resource and Environment, Mianyang Normal University, Mianyang 621000, China; 2.School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China; 3.National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China
Abstract：Copper had obvious catalytic effect on the oxidization reaction of “Sunset Yellow” by H2O2 in boric acid buffer solution. The reaction product had maximum absorption peak at 530 nm. Based on this principle, the direction determination method of copper in river water by flow injection-catalytic spectrophotometry was established. The parameters of flow injection system were optimized. The selected experimental conditions were as follows: the flow rate of carrier solution (C), the coloring solution (R1), the coloring solution (R2) and sample solution (S) was 0.75 mL/min, 0.30 mL/min, 0.30 mL/min and 0.55 mL/min, respectively; the length of reaction loop (L) was 2 m; the volume of sampling ring was 350 μL. The concentration of used reagents was optimized. The selected concentration for “Sunset Yellow” and H2O2 was 0.027 g/L and 0.005 mol/L, respectively. The pH of buffer solution was 9.8. The concentration of copper in range of 20-1 000 μg/L showed good linearity to the peak height with correlation coefficient of 0.999. The detection limit of method was 1.5 μg/L. The copper in river water was analyzed. The found results were consistent with those obtained by national standard method. The relative standard deviations (RSD) were between 0.48% and 1.2%.
李辉，魏良，张新申，李华. 流动注射—H2O2-日落黄催化光度法测定河水中铜[J]. 冶金分析, 2013, 33(10): 60-63.
LI Hui,WEI Liang, ZHANG Xin-shen, LI Hua. Determination of copper in river water by flow injection in alliance with H2O2-Sunset Yellow catalytic spectrophotometry. , 2013, 33(10): 60-63.
宋元林. 萘茜光度法直接测定茶叶中的微量铜[J]. 光谱学与光谱分析(Spectroscopy and Spectral Analysis), 2003, 23(1):167-169.
[3]
Lin H C, Chou Y H, Yang J. Development of an aminocarboxylic acid-modified infrared chemical sensor for selective determination of copper ions in aqueous solutions[J]. Anal. Chim. Acta, 2008, 611(1): 89-96.
Cabon J Y. Determination of Cu and Mn in seawater by graphite furnace atomic absorption spectrometry with the use of hydrofluoric acid as a chemical modifier[J]. Spectrochimica Acta: Part B, 2002, 57(4):939-950.
[8]
Fathi S, Yaftian M. Enrichment of trace amounts of copper (Ⅱ) ions in water samples using octadecyl silica disks modified by a Schiff base ionophore prior to flame atomic absorption spectrometric determination[J]. Journal of Hazardous Materials, 2009, 164(1): 133-137.
Wei J, Teshima N, Ohno S, et al. Catalytic flow injection determination of sub-ppb copper using the redox reaction of cysteine with iron in the presence of 2, 4, 6-tris (2-pyridyl)-1, 3, 5-triazine [J]. Analytical Sciences, 2003, 19(5): 731-738.
