A contribution to the chemical characterization of rivers in the Rio Negro Basin, Brazil
A contribution to the chemical characterization of rivers in the Rio Negro Basin, Brazil
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对巴西里奥内格罗盆地河流化学特征的贡献
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
B. Forsberg
中科院分区：
文献类型：
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作者：
I. L. Küchler;N. Miekeley;B. Forsberg
水样采集自亚马逊流域中部的亚马逊河、内格罗河和内格罗河的 17 条支流。分析包括 pH、电导率和溶解有机物 (DOC) 测量以及等离子体源质谱 (ICP-MS)。因素分析揭示了三个因素，解释了总方差的 94%。因子得分图显示了一个簇，其中大部分样本来自里奥内格罗盆地。超滤测试证实，来自里奥内格罗河的有机物的分子量高于亚马逊河的有机物，并且一些金属与这些化合物有关。内格罗盆地大多数河流的溶解部分中，重稀土元素 (REE) 相对于轻稀土元素有所富集；悬浮物质的情况则相反。
Water samples were collected in Middle Amazonia from the Amazon River, Rio Negro and 17 tributaries of Rio Negro. The analyses consisted of pH, conductivity, and dissolved organic (DOC) measurements, as well as plasma source mass spectrometry (ICP-MS). Factor analysis revealed three factors, which explained 94% of the total variance. A plot of factor scores presented a cluster containing mostly samples from the Rio Negro Basin. Ultrafiltration tests confirmed that organics from the Rio Negro have higher molecular mass than in the Amazon, and that some metals are associated with these compounds. Heavy rare-earth elements (REE) are enriched relative to light REE in the dissolved fraction of most rivers of the Negro Basin; the opposite occurred in suspended matter.