杭州市郊区表层土壤中多环芳烃的风险分析

采集杭州市郊区表层土壤中多环芳烃的样品,用色谱-质谱技术对多环芳烃化合物进行定量分析。美国环保总署推荐优先控制的16种多环芳烃单体质量分数在1.49～87.43 ng.g-1之间,萘、芴、苊等低分子量芳烃质量分数相对较低;、茚并1,2,3-cd]芘、苯并ghi]苝等高分子量芳烃质量分数相对较高,其中苯并ghi]苝质量分数最高。对照荷兰的土壤标准,杭州市郊区表层土壤中的荧蒽、、茚并1,2,3-cd]芘、苯并ghi]苝超标比较严重,超标率100%;多环芳烃的Bap等效毒性当量是荷兰规定目标值的2倍;因此,杭州市郊区表层土壤中存在一定的潜在风险。多环芳烃Ant/（Phe＋Ant）、BaA/（Chr＋BaA）、Flua/（Pyr＋Flua）等参数表明,多环芳烃主要来源于燃烧源,且以机动车尾气为主;BeP/（BeP＋BaP）比值偏高,可能与土壤中的多环芳烃主要来源于大气沉降有关。

The risk analysis of polycyclic aromatic hydrocarbons in topsoil of suburbs of Hangzhou

samples were collected in topsoil of Suburbs of Hangzhou and PAHs were quantified with GC-MS. The content of individual PAHs recommended by USEPA was between 1.49 and 87.43 ng.g1. The PAHs with low molecular weight, such as Nap, Flu, Ace were observed in relatively low content. The PAHs with high molecular weight, such as Chrysene, Indeno1,2,3-cd]pyrene, Benzoghi]perylene were relatively abundant. Fluoranthene, Chrysene, Indeno1,2,3-cd]pyrene, Benzoghi]perylene exceeded standards of Holand by 100%. The total Bap toxic equivalent of PAHs was two times of Dutch target value of soil. This meaned there were ecological risk in topsoil of Suburbs of Hangzhou. The ratios of Ant/（Phe＋Ant）, BaA/（Chr＋BaA）, Flua/（Pyr＋Flua） showed the sources of PAHs were mainly from combustion, especially vehicles. The ratio of BeP/（BeP＋BaP） was relatively high, and maybe relate to atmospheric deposition.