二苯碳酰二肼分光光度法测定饮用水中六价铬的改进探讨
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摘要
目的改进生活饮用水中六价铬的检测方法(二苯碳酰二肼分光光度法),消除二价铁对检测的干扰。方法对生活饮用水标准检验方法 GB/T5750.6-2006 10.1二苯碳酰二肼分光光度法(原法)测定水中六价铬的方法进行了适当的改进,检测前将水样pH值调至弱碱性,改变试剂的加入顺序,测定时先加二苯碳酰二肼和六价铬生成比较稳定的络合物,再加酸调节pH值以消除二价铁离子的干扰。结果方法曲线在0.004μg/mL～0.2μg/mL有良好的线性关系,r=0.999 5,最低检测质量浓度0.004 mg/L,回收率为96.0%～104.0%,相对标准偏差为0.4%。结论实验结果可靠,本改进方法可消除二价铁对分光光度法测定饮用水中六价铬的干扰。
Objective Improving the detection method of hexavalent chromium in drinking water(Spectrophotometric method of diphenylcarbazide),elimination of interference of ferrous bivalent to detection.Methods Standard Test Method for drinking water, GB/T5750.6-2006 10.1, two benzoyl two hydrazine spectrophotometric method(original method) for the determination of six valence chromium in water, The pH value of water sample was adjusted to weak alkalinity before testing,Change the order of reagents,First, two benzoyl two hydrazine and six valent chromium were added to form a more stable complex,Adding acid to adjust pH value to eliminate the interference of two valent iron ions.Resuls The method curves have good linear relationship at 0.004 g/mL ～ 0.2 mu g/mL. The minimum detection quality of the r:0.999 5. method is 0.004 mg/L, the recovery rate is 96.0 % ～104.0 %, and the relative standard deviation is 0.4 %.Conclusions The improved method can eliminate the interference of two valence iron in Spectrophotometric Determination of six valent chromium in drinking water.
Objective Improving the detection method of hexavalent chromium in drinking water(Spectrophotometric method of diphenylcarbazide),elimination of interference of ferrous bivalent to detection.Methods Standard Test Method for drinking water, GB/T5750.6-2006 10.1, two benzoyl two hydrazine spectrophotometric method(original method) for the determination of six valence chromium in water, The pH value of water sample was adjusted to weak alkalinity before testing,Change the order of reagents,First, two benzoyl two hydrazine and six valent chromium were added to form a more stable complex,Adding acid to adjust pH value to eliminate the interference of two valent iron ions.Resuls The method curves have good linear relationship at 0.004 g/mL ～ 0.2 mu g/mL. The minimum detection quality of the r:0.999 5. method is 0.004 mg/L, the recovery rate is 96.0 % ～104.0 %, and the relative standard deviation is 0.4 %.Conclusions The improved method can eliminate the interference of two valence iron in Spectrophotometric Determination of six valent chromium in drinking water.
引文
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[2]钟唐.高价铬与低价铬对人体的作用[J].皮革科技,1988,3(17):44.
[3]中华人民共和国卫生部.生活饮用水中铬的测定:GB/T5750.6-2006[S].北京:中国标准出版社,2006.
[4]毕彤,卢晓军,唐斌.二苯碳酰二肼测定水中铬方法的改进-还原性物质存在六价铬分析的探讨[J].环境保护科学,1987,4:36-40.
[5]苏雪妮,张志广.分光光度法测定六价铬影响因素的概述[J].广州化工,2009,37(6):149-150.
[6]雷万荣,唐春梅,江凌云.浅谈地下水铁、锰质的迁移与富集规律[J].江西科学,2006,24(2):80-82.
[7]周全,韩珀,徐娟,等.输配水过程中管网铁释放规律的研究及应用[J].郑州大学学报,2013,34(3):121-124.