Pb,Cu和Zn在自然水体生物膜中铁/锰氧化物等组分上的富集规律

Enrichment of Pb,Cu and Zn on Ferromanganese Oxides from Surface Coatings Collected in Natural Water

用选择性萃取法萃取天然基质采集的生物膜中的铁/锰氧化物,考察生物膜上铁/锰氧化物对水体中Pb,Cu及Zn的富集作用.结果表明,锰氧化物对生物膜富集Pb起主要作用,而铁氧化物和除铁/锰氧化物以外的以有机质为主的其它组分的作用很小;膜上其它组分对Cu的富集贡献较大,锰氧化物的贡献与铁氧化物的接近;锰氧化物对Zn的富集贡献最大,铁氧化物和其它组分的贡献比较接近.锰氧化物对Pb,Cu及Zn的富集能力分别高于铁氧化物的富集能力,铁氧化物和锰氧化物对3种金属富集能力的大小顺序分别是Zn>Cu>Pb和Zn>Pb≥Cu.

Selective extraction technology was used to extract Fe oxides and Mn oxides from surface coatings. The concentrations of Fe, Mn, Pb, Cu and Zn after extracting were measured to study the enrichment of Pb, Cu and Zn on Fe oxides, Mn oxides and other components. The results show that Mn oxides contribute most to Pb enrichment and the contributions of Fe oxides and other components are relatively small. For Cu enrichment on each component, the contributions of other components are significantly higher and the contributions of Fe oxides are similar to the that of Mn oxides. The contributions of Mn oxides to Zn enrichment are higher, while the contributions of Fe oxides are close to the contributions of other components. The Pb, Cu and Zn enrichment abilities of Mn oxides are bigger than the enrichment abilities of Fe oxides. The Pb, Cu and Zn enrichment abilities of Fe oxides and Mn oxides follow this order respectively： Zn 〉 Cu 〉 Pb, Zn 〉 Pb ≥Cu.