Faculty of Agriculture, Ion Ionescu de Brad University of Agricultural Sciences and Veterinary Medicine of Iasi, Aleea Mihail Sadoveanu 3, 700490 Iasi, Romania.
Sci Total Environ. 2013 Jul 1;456-457:317-24. doi: 10.1016/j.scitotenv.2013.03.103. Epub 2013 Apr 23.
Concentrations of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDE) have been determined in soil, mosses and tree bark samples collected from the same locations in North-Eastern Romania (region of Moldavia). PCBs and PBDEs were under the limit of quantification in all investigated samples. OCPs were the principal pollutants found in the analysed samples. In soil, moss and tree bark samples, DDT together with its metabolites, was the most abundant OCP ranging between 4.4-79, 5.8-95 and 11-440 ng g(-1) in the individual matrices, followed by HCH isomers with levels between 1.1-9.8, 8.9-130 and 12-130 ng g(-1) in soil, moss and bark respectively. To distinguish between the previous and current pollutant input and preferential biodegradation of DDT metabolites, the degradation ratios were calculated between the parent substances and their metabolites (DDT and HCH isomers). The investigation indicates no important pollution sources near sampling sites and reveals that OCPs originate mainly from long-range air transport processes and through atmospheric deposition of isomers volatilised from secondary sources. Discriminant function analysis was performed to determine whether OCPs uptake differ among the three matrices (soil, moss and tree bark). A good separation was observed between tree bark and the other two matrices. The most redundant variable appears to be p,p'-DDE (R(2)=0.336), while the most informative variable seems to be o,p'-DDT (R(2)=0.0361). Significant correlations were found between bark and moss concentrations for most α-HCH and p,p'-DDD (p<0.01). We have also investigated the enantiomeric signature of α-HCH. For bark and moss, EF values suggest preferential degradation of the (-)α-HCH enantiomer.
已在罗马尼亚东北部（摩尔达维亚地区）的同一地点采集的土壤、苔藓和树皮样本中测定了有机氯农药（OCPs）、多氯联苯（PCBs）和多溴二苯醚（PBDEs）的浓度。在所研究的所有样本中，PCBs 和 PBDEs 均低于检测限。在分析样本中，OCPs 是主要污染物。在土壤、苔藓和树皮样本中，DDT 及其代谢物是最丰富的 OCP，其含量分别为 4.4-79、5.8-95 和 11-440ng/g，其次是 HCH 异构体，其含量分别为 1.1-9.8、8.9-130 和 12-130ng/g。为了区分先前和当前的污染物输入以及 DDT 代谢物的优先生物降解，计算了母体物质与其代谢物（DDT 和 HCH 异构体）之间的降解比。调查表明，采样点附近没有重要的污染源，表明 OCPs 主要来源于长距离空气传输过程以及源自二次源的异构体挥发物的大气沉积。进行判别函数分析以确定 OCPs 在三种基质（土壤、苔藓和树皮）中的吸收是否存在差异。观察到树皮与其他两种基质之间有很好的分离。最冗余的变量似乎是 p,p'-DDE（R²=0.336），而最具信息量的变量似乎是 o,p'-DDT（R²=0.0361）。在大多数α-HCH 和 p,p'-DDD 中，发现了树皮和苔藓之间存在显著相关性（p<0.01）。我们还研究了α-HCH 的对映体特征。对于树皮和苔藓，EF 值表明（-）α-HCH 对映体优先降解。
