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对黄河下游及河口区铬的测定结果表明,丰水期不同形态铬的含量均比枯水期高,铬含量的分布与河流径流量、排污量有关。形态研究表明,河水中以颗粒铬[Cr(P)]为主,三价铬[Cr(Ⅲ)]次之,六价铬[Cr(Ⅵ)]最次。近河口区域与河水相似,但在远离河口区域,丰水期Cr(Ⅲ)成为主要形态,Cr(Ⅵ)仍为最次要形态。Cr(Ⅲ)与COD,Cr(P)与COD,及Cr(P)与悬浮体(TSM)均有较好的相关性。Cr(Ⅵ)在河口条件下,可被有机物还原,并被悬浮物吸附而转入沉积物。
The results of determination of chromium in the lower reaches of the Yellow River and estuaries show that the content of chromium in different forms during the wet season is higher than that in the dry season, and the distribution of chromium is related to the runoff and discharge of rivers. Morphological studies show that the particulate chromium [Cr (P)] is the main river water, followed by Cr (Ⅲ) and hexavalent chromium [Cr (Ⅵ)]. The near estuarine area is similar to the river water, but Cr (¢ ö) becomes the predominant form during the wet season when far away from the estuary. Cr (VI) remains the most important form. Cr (Ⅲ) and COD, Cr (P) and COD, and Cr (P) and the suspension (TSM) have a good correlation. Under the estuary condition, Cr (Ⅵ) can be reduced by organic matter and adsorbed by suspended solids and transferred into sediments.