IC Determination of Chromium(Ⅵ) in Natural Water with VIS-Photometric Detection
摘 要
应用离子色谱法测定了天然水中六价铬,给出了试验装置及分析流程的图解.水样经0.22 μm滤膜过滤后分取500 μL进样,经保护柱(IonPac AG7)及分离柱(IonPac AS7)分离,由流量为0.25 mL·min-1的淋洗液(300 mmol·L-1硫酸铵和120 mmol·L-1氨水的混合溶液)洗脱.洗脱液与以流量为0.15 mL·min-1二苯羰酰二肼显色液在混合器中混合后,在反应圈中显色,在540 nm波长处作光度检测.线性范围在0.02~50 μg·L-1之间,检出限(3S/N)为0.010 μg·L-1.对一水样作了12次测定,测定结果的相对标准偏差为1.22%.
Abstract
Ion chromatography was applied to the determination of Cr(Ⅵ) in natural water.Testing installation and flow diagram for the analysis was given.Water sample was filtered with 0.22 μm filtering membrane and an aliquot of 500 μL was introduced into the instrument.The protective column (IonPac AG7) and separation column (IonPac AS7) were used for separation.A mixture of 300 mmol·L-1 (NH4)2SO4 solution and 120 mmol·L-1 aq.ammonia was used as eluant passing through the columns at the flow-rate 0.25 mL·min-1 to elute Cr(Ⅵ) from the column.The eluate was mixed with the color reagent (diphenylcarbazide) solution which was introduced at the flow-rate of 0.15 mL·min-1,at the mixing cell,reacted in the reaction coil to form the colored complex and measured photometrically at the wavelength of 540 nm.Linearity range was found between 0.02-50 μg·L-1,and detection limit (3S/N) was found to be 0.010 μg·L-1.Precision was tested by analyzing a water sample for 12 determinations,value of RSD found was 1.22%.
中图分类号 O652.63
所属栏目 工作简报
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收稿日期 2009/2/26
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备注赵云芝(1980-),女,河南唐河人,工程师,硕士,主要研究方向为离子色谱分析.
引用该论文: ZHAO Yun-zhi,XIE Yong-hong,YANG Ping,QIAN Shu,ZHANG Dan,LIAO Ji. IC Determination of Chromium(Ⅵ) in Natural Water with VIS-Photometric Detection[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2010, 46(5): 485~487
赵云芝,谢永洪,杨坪,钱蜀,张丹,廖激. 离子色谱法-光度检测天然水中铬(Ⅵ)[J]. 理化检验-化学分册, 2010, 46(5): 485~487
被引情况:
【1】陈丽琼,霍巨垣,王欣,幸苑娜,陈泽勇, "六价铬测定方法研究进展",理化检验-化学分册 51, 1208-1212(2015)
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参考文献
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【3】SAWALHA M F,GARDEA-TORRESDEY J L,PARSONS J G,et al.Determination of adsorption and speciation of chromium species by saltbush (Atriplex canescens) biomass using a combination of XAS and ICP-OES[J].Microchem J,2005,81:122-132.
【4】VISNJA O,LUKA M,STIPE L,et al.Determination of Cr(Ⅲ) and Cr(Ⅵ) in industrial and environmental liquid samples by EDXRF method[J].Anal Chim Acta,2004,527:125-129.
【5】WANG Lun,XIA Ting-ting,LIU Jin-shui,et al.Preparation and application of a novel core/shell organic nanoparticle as a fluorescence probe in the selective determination of Cr(Ⅵ)[J].Spectrochimica Acta Part A,2005,62:565-569.
【6】苑宝玲,曲久辉,傅明来,等.荧光猝灭法测定痕量六价铬[J].理化检验-化学分册,2002,38(3):123-124.
【7】WANG Li-shi,ZHANG Shui-feng,DANG Zhi,et al.Running buffers for determination of chromium(Ⅵ)/(Ⅲ),cobalt(Ⅱ) and zinc(Ⅱ) in complex matrices by capillary electrophoresis with contactless conductivity detection[J].Talanta,2007,72:1342-1347.
【8】刘夜月,范松川.离子色谱法测定电镀废水中的六价铬[J].河北化工,1992,1:52-54.
【9】国家环保局.水和废水监测分析方法[M].4版.北京:中国环境出版社,2002:346-349.
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