Abstract：
This preliminary investigation aimed to detect concentrations of chlorinated pesticides and PCBs in 40 sediment samples from three desert oases located in Kharga, Dakhla and Farafra in western Egypt. The residues of 18 PCBs and 16 chlorinated pesticides were measured by GC-MS/MS (SRM) method. The results showed that PCBs and pesticides were present in all studied samples. The concentrations of individual PCBs ranged from undetected to 3.99 ng/g dw in all these sediment samples. The total residue of pesticides (ng/g, dry weight) in sediment samples also varied from 5.18 to 25.92, 5.41 to 29.49, and 5.93 to 24.19 ng/g dw for the Kharga, Dakhla and Farafra Oases, respectively. The concentrations of PCBs and chlorinated pesticides detected in these oasis sediments were lower than that reported for other worldwide locations. According to the recorded concentrations in this baseline study of PCBs and total DDTs, the results revealed the minimal risks to organisms and people in the studied area according to the Effects Range-Low (ERL) and Effects Range-Median (ERM) guideline values.
摘要：
这项初步调查旨在检测位于哈尔加的三个沙漠绿洲的40个沉积物样品中氯化农药和多氯联苯的浓度，埃及西部的达赫拉和法夫拉。采用GC-MS/MS(SRM)法测定了18种多氯联苯和16种氯化农药的残留量。结果表明，所有研究样品中均存在多氯联苯和农药。在所有这些沉积物样品中，单个多氯联苯的浓度范围从未检测到到3.99ng/gdw。农药总残留量(ng/g，Kharga的沉积物样品中的干重）也从5.18到25.92，5.41到29.49和5.93到24.19ng/gdw不等，Dakhla和Farafra绿洲,分别。在这些绿洲沉积物中检测到的多氯联苯和氯化农药的浓度低于世界其他地区的报告浓度。根据多氯联苯和总DDT基线研究中记录的浓度，结果显示,根据影响范围-低(ERL)和影响范围-中位数(ERM)指导值,研究区域的生物体和人的风险最小.
