对沉积物的研究已得出普遍的结论:人类活动排放到天然水体中的重金属污染物,通常以相当不稳定的化学形式—非晶格相存在于表层沉积物中,由于重金属在沉积物/水界面存在着大的浓度梯度,当水环境条件发生变化时,这些弱结合态的金属会再度释放进入水体引起水体的二次污染。因而,对人类活动引入的以弱结合态形式存在于沉积物中的金 Research on sediments has led to the general conclusion that heavy metal pollutants emitted by human activities into natural waters are usually present in surface sediments in relatively unstable chemical forms-amorphous lattices, as heavy metals are present in sediment / Water interface there is a large concentration gradient, when the water environment conditions change, these weakly bound metals will be released into the water again to cause secondary pollution of water bodies. Thus, gold present in sediments in the form of weakly bound states introduced into human activity