催化法测定废水中Cr(Ⅳ)含量
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摘要
弱酸性体系(p H=6.0)及加热80℃的条件下,表面活性剂十二烷基硫酸钠(SDS)增敏Cr(Ⅳ)能加快过氧化氢氧化亚甲基蓝的褪色反应,当反应其他条件不变时,亚甲基蓝褪色速度与Cr(Ⅳ)的浓度成正比.本实验探讨了测定方法的优化条件,并用该方法测定了废水中Cr(Ⅳ)的含量.结果表明:当Cr(Ⅳ)物质的量浓度在0~5.438 85E-05 mol·L-1范围内遵守朗伯比尔定律,其线性回归方程A_(SDS660)=-8 712.5x(SDS)+0.574 4,RSD为0.0845%;平均回收率为96.28%;该方法具有较高灵敏度、准确度,操作简便,可用此方法可有效地测定废水中的Cr(Ⅳ)的含量.
In acidic conditions,the hydrogen peroxide can oxidize methylene blue and make its color fading,but the effect is not obvious. In the presence of solution( p H = 6. 0) and under the condition of 80 ℃,using sodium dodecyl sulfate( SDS) for chromium(Ⅳ) sensitization with hydrogen peroxide catalyzed oxidation catalytic effects of fading reaction of methylene blue,when other reaction conditions are the same,the fading speed of methylene blue is in direct proportional to the concentration of chromium(Ⅳ). This experiment studied optimum reaction condition of the reaction,the method was determined the chromium(Ⅳ) content in waste water,and at the same time,the precision experiment and recovery experiment were made. The results indicate that when the amount of substance concentration of chromium(Ⅳ) is in the range of 0 ~ 5. 43885 E-05 mol·L~(-1),it obeys Lambert-Beer law,equation of linear regression ASDS660 =-8712. 5 x( SDS) + 0. 5744 and precision test RSD is 0.0845%; the average recovery rate is 96. 28%,This method has high sensitivity,accuracy,easy operation,which can be used to effectively measure the chromium(Ⅳ) content in waste water.
In acidic conditions,the hydrogen peroxide can oxidize methylene blue and make its color fading,but the effect is not obvious. In the presence of solution( p H = 6. 0) and under the condition of 80 ℃,using sodium dodecyl sulfate( SDS) for chromium(Ⅳ) sensitization with hydrogen peroxide catalyzed oxidation catalytic effects of fading reaction of methylene blue,when other reaction conditions are the same,the fading speed of methylene blue is in direct proportional to the concentration of chromium(Ⅳ). This experiment studied optimum reaction condition of the reaction,the method was determined the chromium(Ⅳ) content in waste water,and at the same time,the precision experiment and recovery experiment were made. The results indicate that when the amount of substance concentration of chromium(Ⅳ) is in the range of 0 ~ 5. 43885 E-05 mol·L~(-1),it obeys Lambert-Beer law,equation of linear regression ASDS660 =-8712. 5 x( SDS) + 0. 5744 and precision test RSD is 0.0845%; the average recovery rate is 96. 28%,This method has high sensitivity,accuracy,easy operation,which can be used to effectively measure the chromium(Ⅳ) content in waste water.
引文
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[5]王祖丽.分光光度法测定水环境中的铬[J].工业设计,2015,9(9):121-122.
[6]屈伟,周成英,蔡镠璐.分光光度法直接测定矿石中铬[J].冶金分析,2013,33(1):69-72.
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[13]谭芳维.原子荧光光谱测定食品中碘、铬及锑锭中汞的应用研究[D].南宁:分析化学广西大学,2013.
[14]李红英,马彦林.固相萃取分光光度法测定水环境中铬(VI)[J].冶金分析,2008,28(2):48-51.
[15]罗道成,郑李辉.用萃取-分光光度法测定电镀废水中的铬(VI)[J].材料保护,2009,42(10):75-79.
[16]叶榕.工业废水中铬含量的电化学法检测[J].福建分析测试,2002,11(4):1644-1646.
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[18]黄典文,张育广.氧化偶氮胂M褪色光度法测定微量铬的研究[J].广东工业大学学报,2005,22(4):11-12.
[19]白晶.高校实验室含铬废水处理方法研究[J].中国科技信息,2011,16(4):20.
[2]焦士蓉,王玲.催化动力学光度法测定食品中的微量铬(VI)[J].实验科学与技术,2006,4(2):33-35.
[3]莎仁,韩明梅.表面活性剂增敏动力学光度法测定痕量铬(VI)[J].冶金分析,2005,25(3):48-51.
[4]BD Real,MC 0rtiz,LA Sarabia.Analysis of interferents by means a D-optimal screening design and calibration using partial least squares regression in the spectrophotometric detemination of Cr(VI)[J].Ta Ianta,2007,71:1599-1609.
[5]王祖丽.分光光度法测定水环境中的铬[J].工业设计,2015,9(9):121-122.
[6]屈伟,周成英,蔡镠璐.分光光度法直接测定矿石中铬[J].冶金分析,2013,33(1):69-72.
[7]DH Thom8s,Js Rohrer,PE Jackson.Detemination of hexavalent chromium at the level of the California Public Health Goal by ion chromatography[J].Journal of Chl Dmatography A,2002,956:255-259.
[8]Jing Nan,Xiu—Ping Yan.On-line dynamic two-dimensional admicelles solvent extraction coupled to electrothemal atomic absorption spectrometry for detemination of chromium(VI)in drinking water[J].Anal.Chim.Acta,2005,536:207-212.
[9]李健,张凤,吴晓霞等.实验室废液中重金属离子含量测定可行性研究[J].南京晓庄学院学报,2011,6(6):85-88.
[10]王东,袁军成.原子吸收分光光度法测定铬条件探讨[J].中国化工贸易,2012,4(2):124-314.
[11]赖永忠,王亮根.两种双波长法用于减小浊度对废水中六价铬测定结果的影响[J].化学工程师,2012,26(10),27-35.
[12]闫冉.水泥中铬元素的X射线荧光光谱分析方法研究及应用[D].北京:中国建筑材料科学研究总院,2014.
[13]谭芳维.原子荧光光谱测定食品中碘、铬及锑锭中汞的应用研究[D].南宁:分析化学广西大学,2013.
[14]李红英,马彦林.固相萃取分光光度法测定水环境中铬(VI)[J].冶金分析,2008,28(2):48-51.
[15]罗道成,郑李辉.用萃取-分光光度法测定电镀废水中的铬(VI)[J].材料保护,2009,42(10):75-79.
[16]叶榕.工业废水中铬含量的电化学法检测[J].福建分析测试,2002,11(4):1644-1646.
[17]吕建波,刘东方,李杰等.水中铬的吸附法处理技术研究现状与进展[J].水处理技术,2013,39(12):5-10.
[18]黄典文,张育广.氧化偶氮胂M褪色光度法测定微量铬的研究[J].广东工业大学学报,2005,22(4):11-12.
[19]白晶.高校实验室含铬废水处理方法研究[J].中国科技信息,2011,16(4):20.