二溴四苯基卟啉分光光度法测定水样中铅
Spectrophotometric Determination of Lead in Water Samples with Dibromo-tetraphenylporphyrin as Chromogenic Reagent
摘 要
研究了显色剂二溴四苯基卟啉与铅(Ⅱ)的显色反应。在Tween-80微乳液及pH 12的磷酸氢二钠-氢氧化钠缓冲溶液中,铅(Ⅱ)与显色剂形成1∶1的稳定配合物。 其最大吸收位于472 nm波长处,表观摩尔吸光率为2.2×104 L·mol-1·cm-1。铅(Ⅱ)的质量浓度在180 μg·L-1以内符合比耳定律。方法用于环境水样中铅(Ⅱ)的测定,回收率在99.9%~102.0%之间。
分光光度法
铅(Ⅱ)
环境水样
Dibromo-tetraphenyl-porphyrin
Spectrophotometry
Lead(Ⅱ)
Environmental water samples
Abstract
Dibromo-tetraphenyl-porphyrin (DBTPP) was used as a new chromogenic reagent for determination of lead(Ⅱ), and conditions for the colour reaction were studied. In a Na2HPO4-NaOH buffer solution of pH 12, and in the presence of Tween-80, a stable coordination complex with the molar ratio ［Pb(Ⅱ)∶(DBTPP)］ of 1 to 1 was formed, with its absorption max. at the wavelength of 472 nm. Value of apparent molar absorptivity was found to be 2.2×104L·mol-1·cm-1. Beer′s law was held in the range within 180 μg·L-1. The proposed method was applied to the determination of lead in environmental water samples, giving values of recovery in the range of 99.9%-102.0%.
中图分类号 O657.32
所属栏目
基金项目 江苏大学高级人才基金(05JDG051)
收稿日期 2011/4/2
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备注沈薇(1986-),女,河北深泽人,硕士研究生,从事卟啉类配合物的应用研究。
引用该论文: SHEN Wei,SHAN Chi,ZHANG Xiu-feng,ZHU Wei-hua,OU Zhong-ping. Spectrophotometric Determination of Lead in Water Samples with Dibromo-tetraphenylporphyrin as Chromogenic Reagent[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2011, 47(9): 1055～1057
沈薇,单驰,张秀风,朱卫华,欧忠平. 二溴四苯基卟啉分光光度法测定水样中铅[J]. 理化检验－化学分册, 2011, 47(9): 1055～1057
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参考文献
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【2】XIANG Guo-qiang, HUANG Yan, LUO Yi-fan. Solid phase extraction of trace cadmium and lead in food samples using modified peanut shell prior to determination by flame atomic absorption spectrometry［J］. Microchim Acta, 2009,165:237-242.
【3】GHAEDI M, SHOKROLLAHI A, KIANFAR A H, et al. The determination of some heavy metals in food samples by flame atomic absorption spectrometry after their separation-preconcentration on bis salicyl aldehyde, 1,3-propan diimine (BSPDI) loaded on activated carbon［J］. Journal of Hazardous Materials, 2008,154:128-134.
【4】LI Zai-jun, YANG Yu-ling, TANG Jian, et al. Spectrophotometric determination of trace lead in water after preconcetration using mercaptosephadex［J］. Talanta, 2003,60:123-130.
【5】LI Zai-jun, TANG Jian, PAN Jiao-mai. The determination of lead in preserved food by spectrophotometry with dibromohydroxyphenylporphyrin［J］. Food Control, 2004,15:565-570.
【6】ASANO T, YABUSAKI K, WANG Pi-chao, et al. Determination of lead in fly ash leachate using a newly developed simple spectrophotometric method［J］. Spectrochimica Acta Part A, 2010,75:819-824.
【7】RUENGSITAGOON W, CHISVERT A, LIAWRUANGRATH S. Flow injection spectrophotometric determination of lead using 1,5-diphenylthiocarbazone in aqueous micellar［J］. Talanta, 2010,81:709-713.
【8】KILIAN K, PYRZNSKA K. Spectrophotometric study of Cd(Ⅱ), Pb(Ⅱ), Hg(Ⅱ) and Zn(Ⅱ) complexes with 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin［J］. Talanta, 2003,60:669-678.
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