典型文献
Occurrence and ecotoxicological risk assessment of pesticides in sediments of the Rosetta branch,Nile River,Egypt
文献摘要：
This study aimed to(1)monitor the occurrence and spatiotemporal variations of 100 pes-ticides in sediments collected monthly from July 2018 to June 2019 from sampling sites in El-Rahawy,Sabal,and Tala,along the Rosetta branch of the Nile River,Egypt,and(2)per-form an ecological risk assessment for aquatic organisms upon exposure to the detected sediment pesticides based on the risk quotient(RQ)method.Out of the 100 pesticides mon-itored,16 pesticides belonging to seven chemical families were detected,and 55％of the sediment samples were contaminated with one or more pesticide residues.The mean con-centration(mg/kg dry weight(dw))and detection frequency(％)of the four most frequently detected pesticides in the sediment samples were as follows:chlorpyrifos(0.18 mg/kg dw and 34％),p,p'-DDE(0.018 mg/kg dw and 30％),cypermethrin(0.03 mg/kg dw and 14％),and deltamethrin(0.026 mg/kg dw and 13％).The spatial distribution exhibited that El-Rahawy had the highest pesticide load(2.86 mg/kg dw)among the studied sites,whereas the tem-poral variations revealed that the highest total pesticide concentrations were detected in winter season(1.73 mg/kg dw).Meanwhile,12 pesticides showed high RQs(＞1),posing a potential ecological risk to aquatic species that live and feed on such sediments.
文献关键词：
中图分类号：
作者姓名：
Fawzy Eissa;Mahmoud Al-Sisi;Khaled Ghanem
作者机构：
Environment and Bio-agriculture Department,Faculty of Agriculture,Al-Azhar University,Nasr City,Cairo 11884,Egypt;Central Laboratory of Residue Analysis of Pesticides and Heavy Metals in Food(QCAP),Agricultural Research Center,Dokki,Giza 12311,Egypt
文献出处：
引用格式：
[1]Fawzy Eissa;Mahmoud Al-Sisi;Khaled Ghanem-.Occurrence and ecotoxicological risk assessment of pesticides in sediments of the Rosetta branch,Nile River,Egypt)[J].环境科学学报（英文版）,2022(08):21-31
A类：
Rahawy,Sabal,Tala,itored,cypermethrin,deltamethrin,RQs
B类：
Occurrence,ecotoxicological,risk,assessment,pesticides,sediments,Rosetta,branch,Nile,River,Egypt,This,study,aimed,monitor,occurrence,spatiotemporal,variations,collected,monthly,from,July,June,sampling,sites,El,along,form,ecological,aquatic,organisms,upon,exposure,detected,quotient,method,Out,belonging,seven,chemical,families,were,samples,contaminated,one,more,residues,mean,dry,weight,dw,detection,frequency,four,most,frequently,follows,chlorpyrifos,DDE,spatial,distribution,exhibited,that,had,highest,load,among,studied,whereas,revealed,total,concentrations,winter,season,Meanwhile,showed,posing,potential,species,live,feed,such
AB值：
0.435756
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