卡尔费休法快速测定含油污泥土壤含水率

Water content in oily sludge or soil quickly determined by Carl-Fischer method

含油污泥或含油土壤中同时存在两种可挥发的液体:石油和水,烘干法失重法测定含水率时,含油污泥或含油土壤中的轻质石油烃也会同时挥发,造成样品含水率测定不准确。直接把含油污泥或含油土壤加到卡尔费休滴定容器中,内部萃取后测定其含水率,简化了操作步骤,结果发现该法重现性好,准确度高。

In oily sludge or soil,there are two coexisting volatile liquids:oil and water.When the drying method is used to determine the water content,the water content in the oily sludge or soil can not be correctly measured due to the evaporation of light petroleum hydrocarbons in the oily sludge or soil at the same time.Directly adding the oily sludge or soil to the Carl-Fischer titration vessel,the water content is determined after internal extraction,which simplifies the operation steps.The measuring results indicate that the method is more reproducible and accurate.