土壤和植物样品的多环芳烃分析方法研究

采用超声提取的前处理方法并结合HPLC/UV分离和分析技术,研究了土壤和植物样品的多环芳烃(PAHs)分析方法。结果表明,植物样品中供试6种PAHs的方法回收率为76.00%￣103.1%,相对标准偏差(RSD)均小于4.1%。土壤样品(干土或湿土,湿土含水量为50%田间持水量)中6种PAHs的方法回收率均高于85%,RSD则低于3.1%;但干土的方法回收率要高于湿土,RSD则比湿土略低。所建立的分析方法具有操作简单、省时的优点,有可接受的回收率和较好的重复性,可用于污染土壤和植物样品的PAHs检测分析。

Analysis Method for Polycyclic Aromatic Hydrocarbons (PAHs) in Plant and Soil Samples

There are large areas of contaminated soils by polycyclic aromatic hydrocarbons (PAHs) in China and all over the world, posing great threats to ecology health and human lives. A novel and prospective analysis method of PAHs for environmental samples such as soils and plants is urgently needed for risk assessment of agricultural products and soil remediation. By using the ultrosonication extraction and HPLC/UV analysis techniques, a simple, available and instructive analysis method of PAHs for soil and plant samples was experimented. The recoveries of six tested PAHs including phenanthrene, anthracene, pyrene, fluoranthene, benzoa]anthracene, and benzoa]pyrene for ryegrass samples were 76.00%~103.1%, with relatively standard deviations (RSD) less than 4.1%. As to the soil samples including the dry soil (DS) and wet soil (WS, 50% of the field holding capacity), the recoveries of these PAHs were always larger than 85% with RSD smaller than 3.1%. In addition, the recoveries of PAHs for DS samples were generally higher than those for WS ones, while the RSD of the former was smaller than that of the latter. This potentially useful and prospective analysis method for environmental soil and plant samples would be of great importance for the soil restoration and risk assessment.