Selective reduction of arsenic species by hydride generation - atomic absorption spectrometry. Part 2 - sample storage and arsenic determination in natural waters
Selective reduction of arsenic species by hydride generation - atomic absorption spectrometry. Part 2 - sample storage and arsenic determination in natural waters
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DOI：
10.1590/s0103-50532001000100004
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发表时间：
2001
影响因子：
1.4
通讯作者：
S. Quináia;M. Rollemberg
中科院分区：
文献类型：
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作者：
S. Quináia;M. Rollemberg
总砷、砷（III）、砷（V）和二甲胂酸（DMA）的选择性测定方法为原子吸收光谱法测定的天然方法，还原性差。帕拉作为水的一部分，水的砷含量最高。对As（III）（柠檬酸）、As（III）+ DMA（醋酸）、As（III）+ As（V）（氯甲酸）的检出限分别为0.6、1.1和0.5mg As L-1。在自然界中建立砷的形式的研究揭示了一些特有的反应，以使砷的释放量足够。采用氢化物发生-原子吸收光谱法，以硼氢化钠（III）为还原剂，在不同还原介质中，选择性测定天然沃茨中的总砷、亚砷酸盐、胂酸盐和二甲基胂酸（DMA）。对巴西巴拉那州北部地区的河水样本进行了分析，结果表明砷酸盐是砷的主要形式。As（III）（柠檬酸盐缓冲液）、As（III）+ DMA（乙酸）和As（III）+ As（V）（盐酸）的检出限分别为0.6、1.1和0.5 mg As L-1。在适当的反应介质中储存样品是保存水样的有效方法。
Arsenio total, As(III), As(V) e acido dimetilarsinico (DMA) foram determinados seletivamente em aguas naturais pela tecnica da geracao de hidretos ‐ espectrometria de absorcao atomica, em diferentes meios de reducao. Para as amostras de agua de rio investigadas os resultados mostraram ser arsenato a forma arsenical predominante. Os limites de deteccao encontrados para As(III) (tampao citrato), As(III) + DMA (acido acetico ) e As(III) + As(V) (acido cloridrico) foram, respectivamente, 0.6, 1.1 e 0.5 mg As L -1 . O estudo da estabilidade das formas arsenicais em amostras de aguas naturais revelou serem os proprios meios reacionais convenientes para uma preservacao adequada das amostras. Total arsenic, arsenite, arsinate and dimethylarsinic acid (DMA) were selectively determined in natural waters by hydride generation ‐ atomic absorption spectrometry, using sodium tetrahydroborate(III) as reductant but in different reduction media. River water samples from the north region of Parana State, Brazil, were analysed and showed arsenate as the principal arsenical form. Detection limits found for As(III) (citrate buffer), As(III) + DMA (acetic acid) and As(III) + As(V) (hydrochloric acid) were 0.6, 1.1 and 0.5 mg As L -1 , respectively. Sample storage on the proper reaction media revealed to be a useful way to preserve the water sample.