阳极溶出伏安法、石墨炉原子吸收法测定海水中总铬的方法比较研究
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摘要
铬是海洋水体中的痕量重金属之一,海水的高盐基体对铬的测定有严重的干扰,而且海水中同时存在Cr(Ⅲ)和Cr(Ⅵ),两种不同价态给测定也带来了一定难度。文章从Cr(Ⅲ)的氧化率、方法检出限、精密度、实际样品加标等方面对过氧化氢氧化-阳极溶出伏安法与传统的MIBK萃取-无火焰原子吸收分光光度法进行了比较研究,发现两种方法在测试结果上无显著差异,但是过氧化氢氧化-阳极溶出伏安法具有更高的精密度,更低的检出限,且对Cr(Ⅲ)的回收率略有提升。
Chromium is one of the trace heavy metals in seawaters. The high salt matrix of seawater has serious interference with the determination of chromium. In addition Cr( III) and Cr( VI) co-exist simultaneously in seawater,and two different valence states have brought difficulties to the determination. Anodic stripping voltammetry is increasingly used in determination of high salt matrix samples such as seawater. The Cr( III) oxidation rate,method detection limit,precision and other aspects are compared between anodic stripping voltammetry and MIBK-GFAAS. The methods have no significant difference in the test results,but the hydrogen peroxide oxidation-anodic stripping voltammetry has higher precision,and the recovery rate of Cr( Ⅲ)increased slightly.
Chromium is one of the trace heavy metals in seawaters. The high salt matrix of seawater has serious interference with the determination of chromium. In addition Cr( III) and Cr( VI) co-exist simultaneously in seawater,and two different valence states have brought difficulties to the determination. Anodic stripping voltammetry is increasingly used in determination of high salt matrix samples such as seawater. The Cr( III) oxidation rate,method detection limit,precision and other aspects are compared between anodic stripping voltammetry and MIBK-GFAAS. The methods have no significant difference in the test results,but the hydrogen peroxide oxidation-anodic stripping voltammetry has higher precision,and the recovery rate of Cr( Ⅲ)increased slightly.
引文
[1]聂利华,李训仕,林壮森,等.拟柱胞藻对水体重金属的生物富集作用研究[J].水生态学杂志,2017,38(1):41-45.
[2]郑蒙蒙,邵鲁泽,管幼青,等.藻类富集水体重金属的机理及应用[J].环境科技,2017,30(6):66-70.
[3]梁新艳.几种重金属离子对藻细胞生长影响的研究[D].山西:山西大学,2016.
[4]海洋监测规范第4部分:海水分析(GB 17378.4-2007)[S].中国国家标准化管理委员会,2007.
[5]母清林,方杰,佘运勇,等.在线稀释/预浓缩-电感耦合等离子体质谱法分析海水中11种痕量元素[J].分析化学,2015,43(9):1360-1365.
[6]卢水淼,邱明,李剑,等.六极杆碰撞反应池-ICPMS法测定海水中痕量金属元素[J].化学分析计量,2016,25(6):13-16.
[7]Robert K.Mugo,.Kristin J.Orians.Seagoing method for the determination of chromium(III)and total chromium in sea water by electron-capture detection gas chromatography[J]Analytica Chimica Acta,1993,271(1):1-9
[8]W Ahmad,AS Bashammakh,AA Al-Sibaai,etc.Trace determination of Cr(III)and Cr(VI)species in water samples via dispersive liquid-liquid microextraction and microvolume UV-Vis spectrometry[J].Journal of Molecular Liquids,2016(224):1242-1248.
[9]陈秀梅,刘琳娟,张晔霞,等.过氧化氢氧化-全自动石墨消解仪加热消解海水中总铬的实验条件探讨[J].环境监控与预警,2016(10):19-21.
[2]郑蒙蒙,邵鲁泽,管幼青,等.藻类富集水体重金属的机理及应用[J].环境科技,2017,30(6):66-70.
[3]梁新艳.几种重金属离子对藻细胞生长影响的研究[D].山西:山西大学,2016.
[4]海洋监测规范第4部分:海水分析(GB 17378.4-2007)[S].中国国家标准化管理委员会,2007.
[5]母清林,方杰,佘运勇,等.在线稀释/预浓缩-电感耦合等离子体质谱法分析海水中11种痕量元素[J].分析化学,2015,43(9):1360-1365.
[6]卢水淼,邱明,李剑,等.六极杆碰撞反应池-ICPMS法测定海水中痕量金属元素[J].化学分析计量,2016,25(6):13-16.
[7]Robert K.Mugo,.Kristin J.Orians.Seagoing method for the determination of chromium(III)and total chromium in sea water by electron-capture detection gas chromatography[J]Analytica Chimica Acta,1993,271(1):1-9
[8]W Ahmad,AS Bashammakh,AA Al-Sibaai,etc.Trace determination of Cr(III)and Cr(VI)species in water samples via dispersive liquid-liquid microextraction and microvolume UV-Vis spectrometry[J].Journal of Molecular Liquids,2016(224):1242-1248.
[9]陈秀梅,刘琳娟,张晔霞,等.过氧化氢氧化-全自动石墨消解仪加热消解海水中总铬的实验条件探讨[J].环境监控与预警,2016(10):19-21.