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首页> 外文期刊>Chemistry and Ecology >Distribution of polychlorinated dibenzo-p-dioxins,polychlorinated dibenzofurans,dioxin-like polychlorinated biphenyl and polycyclic aromatic hydrocarbons in the sediment of temsah lake,suez canal,egypt
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Distribution of polychlorinated dibenzo-p-dioxins,polychlorinated dibenzofurans,dioxin-like polychlorinated biphenyl and polycyclic aromatic hydrocarbons in the sediment of temsah lake,suez canal,egypt

机译：多姆斯二苯并对二恶英，多氯二苯并呋喃，类二恶英类多氯联苯和多环芳烃在埃及特伊萨湖，苏伊士运河和埃及的沉积物中的分布

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Lake Temsah is one of the main wetlands in the Suez Canal region,and the main source for fish for the area.The lake is the end-point of several wastewater effluents.In the present study,residues of polychlorinated dibenzo-p-dioxins(PCDDs)and polychlorinated dibenzofurans(PCDFs),dioxin-like polychlorinated biphenyl(PCS)and polycyclic aromatic hydrocarbons(PAH)were monitored in the sediment of the lake.Samples were collected from six different sampling stations around the lake using a box-corer sampler,then kept frozen.Samples were extracted and cleaned up before residue determination was conducted using an HRGC/HRMS.An HP 6890 plus gas chromatograph was coupled to a Micromass Autospec Ultima mass spectrometer operating in El mode at 35 eV and with a resolution of 10.000(5% valley).PCDDs and PCDFs were detected in all sediment samples collected from various sampling stations.Results showed some progressive increase in PCDDs concentrations relevant to increase in chlorination.In the PCDD group of congeners,1,2,3,4,6,7,8,9 octa-CDD had the highest detected concentrations in all samples,while 2,3,7,8 tetra-CDD showed the lowest concentrations.The World Health Organization toxicity equivalents ranged from 0.387 to 11.20 ng kg~(-1)d.w.For PCDD homologues,hexa-CDD was the most dominant homologue in all sediment samples analysed.Regarding dioxin-like PCBs,results showed that IUPAC No.118 congener,2,3,4,4,5,pentachlorobiphenyl was the most concentrated of all detected congeners,with concentrations ranging between 0.039 and 43.201 mug kg~(-1).For polycyclic aromatic hydrocarbons,benzo(b+ k+j)fluoranthene had the highest concentrations in almost all sampling stations.However,fluorene was the smallest detected concentration in almost all stations.This result would indicate that PAH contamination of the lake seems to be coming from one main source in all sampling stations.The present work is the first record of PCCDs,PCCFs,and dioxin-like PCBs in the Temsah lake.The concentrations of the contaminants monitored in this study,especially those of PAHs,are rather alarming.Efforts should be made to stop point sources that contaminate the lake.
机译：特马萨湖是苏伊士运河地区的主要湿地之一，也是该地区鱼类的主要来源。该湖是几种废水的终点。在本研究中，多氯二苯并对二恶英的残留量（在湖泊沉积物中监测了PCDDs和多氯二苯并呋喃（PCDFs），二恶英类多氯联苯（PCS）和多环芳烃（PAH），并使用箱心取样器从湖周围六个不同的采样站采集了样品然后将其冷冻。在使用HRGC / HRMS进行残留测定之前，先提取样品并进行清洁。将HP 6890 plus气相色谱仪与以35 eV在El模式下运行且分辨率为10.000的Micromass Autospec Ultima质谱仪联用。 （5％谷）从各个采样站收集的所有沉积物样品中都检测到PCDDs和PCDFs，结果表明PCDDs浓度逐渐增加与氯化的增加有关。在所有样品中，1,2,3,4,6,7,8,9八溴环十二烷的检测浓度最高，而2,3,7,8四溴环十二烷的检测浓度最低。组织毒性当量范围为0.387至11.20 ng kg〜（-1）dw对于PCDD同源物，六-CDD是所有沉积物样品中最主要的同源物。关于二恶英样多氯联苯，结果显示IUPAC No.118同源物2 ，3,4,4,5，五氯联苯是所有检测到的同类物中浓度最高的，浓度范围为0.039至43.201马克杯kg〜（-1）。对于多环芳烃，苯并（b + k + j）荧蒽最高几乎所有采样站的浓度都是如此。然而，芴是几乎所有采样站中检测到的最小浓度。这一结果表明，湖泊中PAH的污染似乎来自所有采样站的一个主要来源。本工作是第一笔记录。淡湖中PCCD，PCCF和二恶英样PCB的浓度。在这项研究中监测的污染物中，特别是多环芳烃的污染物相当惊人。应努力制止污染湖泊的点源。

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