Historical fluxes of metal and metalloids in an aquatic ecosystem affected by land-use change and mining activities in northwestern Mexico  

作　　者：Ochoa-Contreras Roberto Jara-Marini Martín Enrique Ruiz-Fernandez Ana Carolina Sanchez-Cabeza Joan Albert Meza-Figueroa Diana Perez-Bernal Libia Hascibe 

机构地区：[1]Posgrado en Ciencias,Centro de Investigacion en Alimentacion y Desarrollo,Unidad Hermosillo,Carretera Gustavo Astiazaran Rosas 46,Colonia La Victoria,Hermosillo,Sonora 83304,Mexico [2]Centro de Investigacion en Alimentacion y Desarrollo,Unidad Hermosillo,Carretera Gustavo Astiazaran Rosas 46,Colonia La Victoria,Hermosillo,Sonora 83304,Mexico [3]Unidad Academica Mazatlan,Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autonoma de Mexico,Calzada Montes Camarena s/n,Col.Playa Sur,Mazatlan 82040,Mexico [4]Departamento de Geología,Division de Ciencias Exactas y Naturales,Universidad de Sonora,Rosales y Encinas,Hermosillo,Sonora 83000,Mexico

出　　处：《International Journal of Sediment Research》2023年第5期724-738,共15页国际泥沙研究（英文版）

基　　金：supported by the project grant#20562“Accu-mulation and distribution of metals and metalloids in water,sediments and biota in the Yaqui River Basin,Sonora State”,from Centro de Investigacion en Alimentacion y Desarrollo,A.C.The scholarship of R.Ochoa-Contreras was provided by the Consejo Nacional de Ciencia y Tecnología of Mexico.

摘　　要：Freshwater reservoirs are essential owing because of their ecological,economic,and social importance.They are particularly vulnerable to contamination,as of metal and metalloids,derived from anthropo-genic activities like mining.The temporal variations in trace element concentrations(arsenic(As),mercury(Hg),chromium(Cr),copper(Cu),nickel(Ni),lead(Pb),and zinc(Zn)),enrichment,fluxes,and possible sources were evaluated by studying two sediment cores from the La Angostura(ANG)Reservoir(northwest Mexico),using 210 Pb geochronology.The enrichment factors showed from null to minor enrichment for most elements,but moderate to severe enrichment of mercury(Hg).Most trace element concentrations had a detrital origin,and notable Hg concentration increases since the past decade were associated with severe drought periods,likely resulting from wildfires.The observed sediment con-centrations of As and Hg can cause adverse effects on biota in the ecosystem since they are above the probable effect level(PEL).Development of strategies for metal attenuation in this reservoir is recom-mended and metals should be controlled until specific ecotoxicological studies are performed.

关 键 词：Aquatic ecosystems 210 Pb geochronology Mining activities Metals METALLOIDS Enrichment factors 

分 类 号：X143[环境科学与工程—环境科学] F301.2[经济管理—产业经济]