土壤和沉积物中苯系物的热解析气相色谱分析方法

通过热解析与气相色谱联用技术,系统研究了利用内标法测定土壤和沉积物中的苯系物(BTEX)的方法。结果表明,该方法操作简单,分析速度快,重现性好,检测下限低,适用于近地表油气地球化学勘探样品中BTEX的分析测试。确定了以4-溴氟苯为内标化合物的有效性,并测定了其与苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯单组分之间的质量-峰面积线性相关关系,相关系数全部在0.99以上。用实际土壤和海洋沉积物样品和人工合成样品考察了方法的重现性、回收率和检出限,均得到令人满意的结果,各单组分的检出限均不高于10 ng/g。

Determination of benzene series in soil and sediment with combined thermal desorption gas chromatography

Systematical experiments have been conducted to determine BTEX in soil and sediment using internal standard through combining thermal desorption and gas chromatography.This method has been proved simple and rapid to operate and the analysis results have been proved repeatable and reproducible.It is suitable to determine BTEX in geochemical survey.The efficiency of 1-bromo-4-fluorobenzene as the internal standard for BTEX determination has been investigated,and its mass-peak area linear dependence relations with other single component of BTEX have been identified(all above 0.99).The reproducibility,recovery rate and detection limit of the new method have been tested with real soil,marine sediment and artificially synthesized samples and have achieved satisfying results.The detection limits of the method are below 10 ng/g for each single component of BTEX.