土壤中矿物油含量测定方法研究

建立了土壤中矿物油含量的分析方法。采集的土壤鲜样,采用无水硫酸钠进行化学干燥。用四氯化碳提取土壤中的油类物质,采用硅酸镁去除提取液中的动植物油等极性化合物后,使用红外分光测油仪测定提取液中的矿物油含量。此方法具有良好的线性关系,相关系数在0.9999以上。测定下限为1.85 mg/l,测定上限为100 mg/l,测量范围为9 mg/kg～500 mg/kg,方法的灵敏度为1.05。试剂空白加标回收率56%～83%,实际样品加标回收率在69%～74%之间。该法简便快速,灵敏准确,具有广泛的应用前景。

Investigate of the Method for the Quantitative Deter Mination of Mineral Oil Content in Soil

Tish report specifies the method for the quantitative determination of mineral oil content in soil.Moist soil taken fron the field is chemically dried with a hygroscopic salt-anhudrous sodium sulfate.Then mineral oil is extracted with carbon tetrachloride.Polar compounds as propagation oil in the extracted solution are removed.And then mineral oil content is determined with Infrared Photometer Oil Content Analyzer.The good linearity was obtained.The limit of determination varies from 1.85 mg/l to 100 mg/l.The optimum cencentration rang was 9mg/kg to 500 mg/kg.The sensitivity of this method was 1.05.The average recovery of the reagent blank was between 56% and 83% and The average recovery of the sample was between 69%and 74%.The method is effective,fast and accurate.