Environmental Implications of Excessive Selenium: A Review

查看全文 作　　者：A. DENNIS LEMLY(United States Forest Service, Southern Research Station, Coldwater Fisheries Research Unit, Department of Fisheries and Wildlife Sciences, Virginia Tech University, Blacksburg, VA 24061-0321, USA)

出　　处：《Biomedical and Environmental Sciences》索引1997年第10卷第4期,共21页

摘　　要：Selenium is a naturally occurring trace element that is nutritionally required in smallamounts but it can become toxic at concentrations only twice those required. The narrow mar-gin between beneficial and harmful levels has important implications for human activities thatincrease the amount of selenium in the environment. Two of these activities, disposal of fbssilfuel wastes and agricultural irrigation of arid, seleniferous soils, have poisoned fish andwildlife, and threatened public health at several locations in the United States. Research stud-ies of these episodes have generated a data base that clearly illustrates the environmental hazardof excessive selenium. It is strongly bioaccumulated by aquatic organisms and even slight in-creases in waterborne concentrations can quickly result in toxic effects such as deformed em-bryos and reproductive failure in wildlife. The selenium data base has been very beneficial indeveloping hazard assessment procedures and establishing environmentally sound water qualitycriteria. The two faces of selenium, required nutrient and Potent toxin, make it a particularlyimportant trace element in the health of both animals and man. Because of this paradox, envi-ronmental selenium in relation to agriculture, fisheries, and wildlife wiIl continue to raise im-POrtant land and water management issues for decades to come. If these issues are dealt withusing prudence and the available environmental selenium data base, adverse irnpacts to naturalresources andspublic health can be 关键词：过量硒环境隐患综述微量元素

相关文献

参考文献（10）
引证文献（10）
耦合文献（0）

参考文献(10)

引证文献(10)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Environmental Implications of Excessive Selenium: A Review

参考文献(10)

引证文献(10)

用户提示