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文章通过对兰州市七里河沟、烂泥沟、大沙沟和排洪沟中污泥的低频磁化率、金属元素和粒度的测定,证明低频磁化率可以很好地评价排污沟污泥中重金属的来源特征。兰州市排污沟污泥中磁性矿物主要与还原性环境中的金属硫化物、外源道路和大气中人类活动产生的磁铁矿、磁赤铁矿和赤铁矿及少量顺磁性矿物,以及黄土高原沙尘暴来源的贡献有关;磁性矿物具有多源性和多类型性特征。排污沟污泥中高有机质含量反映了强烈的人类活动,而人为活动输入的磁性物质是兰州市排污沟污泥中磁性矿物的主要来源。
Based on the determination of low frequency magnetic susceptibility, metal elements and particle size of sludge in Qilihe, Lannigou, Dashaogou and flood drain ditch of Lanzhou City, the author proves that the low frequency magnetic susceptibility can well evaluate the source of heavy metals in sewage sludge feature. Magnetic minerals in sewage sludge in Lanzhou City are mainly related to metal sulfides in reducing environment, magnetite, maghemite and hematite and a small amount of paramagnetic minerals produced by human activities in exogenous roads and the atmosphere, and loess The origin of plateau dust storms is related to the contribution of magnetic minerals with multi-source and multi-type features. The high organic matter content of sewage sludge reflects the intense human activity, while the magnetic material input by human activities is the main source of magnetic minerals in sewage sludge in Lanzhou.