极谱法同时测定海水中的铜、镉、铅、锌
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摘要
建立极谱法同时测定海水中铜、镉、铅、锌的含量。在10.0～35.0℃条件下,试样于–1.15 V恒压下电解,富集在汞电极上生成汞齐,并随电极电位的变化而发生氧化还原反应,产生电流,通过标准加入法进行定性和定量。铜、镉、铅、锌的检出限分别为0.64,0.14,0.17,2.0μg/L,定量限分别为2.5,0.50,0.50,10.0μg/L。样品加标回收率为80.4%～106.0%,测定结果的相对标准偏差为0.43%～6.09%(n=6)。该法具有操作简便、抗干扰性能强、灵敏度高等特点,能够满足海水中铜、镉、铅、锌的监测要求。
A polarographic method was established for the simultaneous determination of copper, cadmium, lead and zinc in seawater. The sample was electrolyzed at –1.15 V under the condition of 10.0–35.0℃. It was enriched on the mercury electrode to form mercury amalgam, and the redox reaction occurs with the change of the electrode potential.The current was generated. The sample was qualitatively and quantitatively determined by standard addition method. The detection limits of copper, cadmium, lead and zinc were 0.64, 0.14, 0.17, 2.0 μg/L, respectively, and the quantitative limits were 2.5, 0.50, 0.50, 10.0 μg/L, respectively. The recoveries were 80.4%–106.0%, and the relative standard deviations were 0.43%–6.09%(n=6). The method has the advantages of simple operation, strong anti-interference performance and high sensitivity, and can meet the monitoring requirements of copper, cadmium, lead and zinc in seawater.
A polarographic method was established for the simultaneous determination of copper, cadmium, lead and zinc in seawater. The sample was electrolyzed at –1.15 V under the condition of 10.0–35.0℃. It was enriched on the mercury electrode to form mercury amalgam, and the redox reaction occurs with the change of the electrode potential.The current was generated. The sample was qualitatively and quantitatively determined by standard addition method. The detection limits of copper, cadmium, lead and zinc were 0.64, 0.14, 0.17, 2.0 μg/L, respectively, and the quantitative limits were 2.5, 0.50, 0.50, 10.0 μg/L, respectively. The recoveries were 80.4%–106.0%, and the relative standard deviations were 0.43%–6.09%(n=6). The method has the advantages of simple operation, strong anti-interference performance and high sensitivity, and can meet the monitoring requirements of copper, cadmium, lead and zinc in seawater.
引文
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[3]Feng H,Han X,Zhang W,et al.A preliminary study of heavy metal contamination in Yangtze River intertidal zone due to urbanization[J].Marine pollution bulletin,2004,49:910-915.
[4]Canli M,Atli G.The relationships between heavy metal(Cd,Cr,Cu,Fe,Pb,Zn)levels and the size of six Mediterranean fish species[J].Environmental pollution,2003,121(1):129-136.
[5]AUBAIL A,MENDEZ-FERNANDEZ P,BUSTAMANTE P,et al.Use of skin and blubber tissues of small cetaceans to assess the trace element content of internal organs[J].Marine pollution bulletin,2013,76:158-169.
[6]GAO X,ZHOU F,CHEN C T A.Pollution status of the bohai sea:an overview of the environmental quality assessment related trace metals[J].Environment international,2014,62:12-30.
[7]刀谞,张霖琳,滕恩江,等.阳极溶出伏安法水体镉污染快速测定方法研究[J].中国测试,2015,2(41):34-37.
[8]刘琳娟,陆培培.海水中铜、铅、镉、锌国标测定条件优化[J].分析测试技术与仪器,2012,18(1):57-61.
[9]GB 17378.4-2007海洋监测规范第4部分:海水分析[S].
[10]GLUODENIS T J.ICP-MS the new standard for inorganic analysis[J].American laboratory news,2000,30(11):24-27.
[11]孙玮玮,蒋洪明,董湘子.THMA-I便携式痕量重金属分析仪在水环境中的应用[J].现代科学仪器,2016(1):126-130.
[12]WANG D,LIN W,YANG X,et al.Occurrences of dissolved trace metals(Cu,Cd,and Mn)in the Pearl River Estuary(China),a large river-groundwater-estuary system[J].Continental shelf research,2012,50/51:54-63.
[13]PAI S C.Preconcentration efficiency of Chelex-100 resin for heavy metals in seawater part1:effects of pH and salts on the distribution ratios of heavy metals[J].Analytica chimica acta,1988,211:257-270.
[14]POEHLE S,SCHMIDT K,KOSCHINSKY A.Determination of Ti,Zr,Nb,V,W and Mo in seawater by a new onlinepreconcentration method and subsequent ICP-MS analysis[J].Oceanographic research papers(deep sea research part I),2015,98:83-93.
[15]卢水淼,邱明,李剑,等.六极杆碰撞反应池-ICP-MS法测定海水中痕量金属元素[J].化学分析计量,2016,6(25):13-16.
[16]SADIKO A,WANEKAYA A K,SCUS A.Advances in analytical technologies for environmental protection and public safety[J].Journal of environmental monitoring,2004(6):513-522.
[17]李宁.阳极溶出伏安法快速连续测定海水中铅镉[J].河北环境科学,2011,85:159-160.
[18]GB/T 3914-2008化学试剂阳极溶出伏安法通则[S].
[19]于庆凯,李丹.阳极溶出伏安法同时测定海水中铜、铅、镉、锌[J].化学工程师,2009(10):25-27.
[20]刘秀洋,孙震,王晴萱.海水中铜铅锌镉的分析方法研究[J].环境科学与管理,2014,39(11):132-134.
[21]HJ 442-2008近岸海域环境监测规范[S].