汞(Hg)对稻田土壤的污染研究

The study of contaminated paddy soil by mercury(Hg)

本研究探索了炼汞废水排入江河后，含汞河水灌溉稻田所造成的土壤汞污染。在对照田和污染田布点，使用土钻以20cm厚度为一层，对土壤作剖面垂直3层采样，在对照田采样58个、污染田60个，计采得118个往状样品，对如上样品皆作总汞与有效态汞含量测定。结果表明：处在汞床地质带范围内的对照田土壤总汞背景值为1．307ppm、有效态汞为0．353ppm。污染田总汞垂直含量是随着深度的增加而降低，但有效态贡含量随垂直深度的变化欠规律。污染田各层土壤总汞与有效态汞的含量均值都非常显著地高于对照田相应层土壤，这是由于长期引用汞染河水灌田，而造成汞在土壤中的明显积累．

The article studied the mercury contamination of paddy soil caused by rive water which was contaminated by waste water from smelting mercury factory.Taking 20 cm deep as a layer with drill,we respectively sampled the control and contaminated paddy soil three layers vertically, which contained 58 samples from control fields and 60 samples from contaminated fields. And then we tested the total mercury contents and available mercury contents. The following results were found: the background contents of total mercury and available mercury in control fields of geological mercury belt were 1.307 ppm and 0.353ppm respectively;the total mercury contents in contaminated fields decreased as the increasing of soil deep,but the available mercury contents had no principle Fthe total mercury contents and available.mercury contents in contaminated fields were much higher than those in control fields respectively, which was caused by using mercury contaminated river water to irrigate the fields and mercury accumulating apparently