基于EDTA络合滴定法测定重金属离子浓度
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摘要
为了简化传统金属离子的测定方法,以乙二胺四乙酸(EDTA)为络合剂,用PAN、二甲酚橙和紫脲酸铵为指示剂测定Cu~(2+)浓度,用铬黑T指示剂测定Mg~(2+)浓度,用二甲酚橙指示剂测定Ni~(2+)浓度.结果表明:以紫脲酸铵为指示剂时,Cu~(2+)浓度测定结果的相对标准偏差(RSD)最小,为0.631%,因此测定Cu~(2+)浓度选择紫脲酸铵为指示剂最合适;以铬黑T为指示剂,Mg~(2+)浓度的测定结果的RSD为0.719%,因此测定Mg~(2+)浓度时可以选择铬黑T指示剂;以二甲酚橙为指示剂时,Ni~(2+)浓度测定结果的RSD为0.760%,因此EDTA络合滴定法测定Ni~(2+)浓度时可选择二甲酚橙指示剂.与原子吸收光谱法相比,EDTA络合滴定法测定金属离子浓度操作简单方便,测定结果具有很高的精密度和准确度.
In order to simplify the traditional determination methods of metal ions, using EDTA as the complexing agent,the concentrations of Cu~(2+)was determined with PAN, xylenol orange and urea ammonium sulfate as indicator,the concentrations of Mg~(2+)and Ni~(2+)were determined respectively with chrome black T and xylenol orange as indicators. The relative standard deviation(RSD) of the determination of Cu~(2+)concentration was the smallest when the urea ammonium sulfate was used as an indicator,and the value was 0.631%. Therefore, it is better to choose the urea ammonium sulfate for the determination of Cu~(2+)concentration. With eriochrome black T as indicator, the RSD of was 0.719%. So the eriochrome black T can be selected to determine of Mg~(2+)concentration.When the xylenol orange was used as indicator, the RSD of Ni~(2+)concentration was 0.760%. Therefore,xylenol orange can be chosen when Ni~(2+)concentration was determined by EDTA complexometric titration.Compared with atomic absorption spectrometry, the determination of metal ion concentration by EDTA complexometric titration was simple and convenient, and the result was of high precision and accuracy.
In order to simplify the traditional determination methods of metal ions, using EDTA as the complexing agent,the concentrations of Cu~(2+)was determined with PAN, xylenol orange and urea ammonium sulfate as indicator,the concentrations of Mg~(2+)and Ni~(2+)were determined respectively with chrome black T and xylenol orange as indicators. The relative standard deviation(RSD) of the determination of Cu~(2+)concentration was the smallest when the urea ammonium sulfate was used as an indicator,and the value was 0.631%. Therefore, it is better to choose the urea ammonium sulfate for the determination of Cu~(2+)concentration. With eriochrome black T as indicator, the RSD of was 0.719%. So the eriochrome black T can be selected to determine of Mg~(2+)concentration.When the xylenol orange was used as indicator, the RSD of Ni~(2+)concentration was 0.760%. Therefore,xylenol orange can be chosen when Ni~(2+)concentration was determined by EDTA complexometric titration.Compared with atomic absorption spectrometry, the determination of metal ion concentration by EDTA complexometric titration was simple and convenient, and the result was of high precision and accuracy.
引文
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[16]吴治先,李春春,钟国清.羟基蛋氨酸铜中铜含量的测定[J].中国饲料,2012(19):29-31.WU Z X,LI C C,ZHONG G Q.Determination of copper content in copper methionine[J].China Feed,2012(19):29-31(in Chinese).
[2]X IAO M,HU J C.Cellulose/chitosan composites prepared in ethylene diamine/potassium thiocyanate for adsorption of heavy metal ions[J].Cellulose,2017,24(6):2545-2557.
[3]WANG F,PAN Y,CAI P,et al.Single and binary adsorption of heavy metal ions from aqueoussolutions using sugarcane cellulose-based adsorbent[J].Bioresour Technol,2017,241:482-490.
[4]马强,黄江明,赵玉林,等.离子交换-原子吸收法测定废水中痕量金属离子[J].矿冶工程,1981(3):57-61.MA Q,HUANG J M,ZHAO Y L,et al.Determination of trace metal ions industrial waste waters with atomic absorption spectrophotometry after ion exchange concentration[J].Mining and Metallurgy Engineering,1981(3):57-61(in Chinese).
[5]雷夏.浊点萃取—火焰原子吸收光谱法测定痕量金属离子[D].保定:河北农业大学,2010.LIE X.Determination of trace metal ions by cloud point extraction-flame atomic absorption spectrometry[D].Baoding:Agricultural University of Hebei,2010(in Chinese).
[6]STALIKAS C D.Micelle-mediated extraction as a tool for separation and preconcentration in metalanalysis[J].Trends Anal Chem,2002,21(5):343-355.
[7]高卫红,王平,历明川.原子吸收法测定高盐(碱)溶液中微量铁、镍的含量[J].山东化工,2005(4):39-40.GAO W H,WANG P,LI M C.The trace fe and ni analysis in saturated brine using atomic absorption spectrophotometry[J].Shandong Chemical Industry,2005(4):39-40(in Chinese).
[8]谢增春,万小红,朱刘.络合滴定法连续测定碲锌镉单晶中镉和锌[J].理化检验:化学分册,2014,50(3):386-387.XIE Z C,WAN X H,ZHU L.Continuous determination of cadmium and zinc in cadmium zinc telluride single crystals by complexometric titration[J].Physical Testing and Chemical Analysis Part B:Chemical Analysis,2014,50(3):386-387(in Chinese).
[9]胡珊玲,张小联,彭光怀,等.EDTA络合滴定法测定稀土镁中间合金中镁[J].冶金分析,2007,27(9):51-53.HU S L,ZHANG X L,PENG G H,et al.Determination of magnesium in rare earth-magnesium middle alloy by EDTA titrimetry[J].Metallurgical Analysis,2007,27(9):51-53(in Chinese).
[10]SHARMA C L.Complexometric titration of Co(II)with EDTA using succinimide as indicator[J].Fresenius′Zeitschrift für Analytische Chemie,1971,253(1):37.
[11]YAPPERT M Cecilia,DUPRE Donald B.Complexometric titrations:Competition of complexing agents in the determination of water hardness with EDTA[J].Journal of Chemical Education,1997,74(12):14-22.
[12]李方文,魏先勋,李彩亭.络合滴定法测定废水中铅离子的浓度[J].工业水处理,2002,22(10):38-39.LI F W,WEI X X,LI C T.Determination of the concentration of lead ions in wastewater by chelatometric titration[J].Industrial Water Treatment,2002,22(10):38-39(in Chinese).
[13]甘峰.基于EDTA的配位滴定通式[J].大学化学,2007,22(5):54-58.GAN F.General formula of complexometric titration based on EDTA[J].University Chemistry,2007,22(5):54-58(in Chinese).
[14]杨合生.PCB工业废水金属离子含量的测定—EDTA法[J].印制电路信息,2007(10):60-63.YANG H S.Measuring metal ions contain of industrial waste water in the PCB plant-EDTA method[J].Printed Circuit Information,2007(10):60-63(in Chinese).
[15]刘和连,许方,黄海平.EDTA络合滴定法测定黄铜中的铜和锌[J].冶金分析,2015,35(5):70-73.LIU H L,XU F,HUANG H P.Determination of copper and zinc in brass by EDTA complexometric titration[J].Metallurgical Analysis,2015,35(5):70-73(in Chinese).
[16]吴治先,李春春,钟国清.羟基蛋氨酸铜中铜含量的测定[J].中国饲料,2012(19):29-31.WU Z X,LI C C,ZHONG G Q.Determination of copper content in copper methionine[J].China Feed,2012(19):29-31(in Chinese).