methodforappraisinglevelofsoilloadingandpollution(m e t h o d f o r a p p r a i s i n g l e v e l ofsoilloadingandpollution).doc

methodforappraisinglevelofsoilloadingandpollution(m e t h o d f o r a p p r a i s i n g l e v e l ofsoilloadingandpollution).doc

  1. 1、本文档共10页,可阅读全部内容。
  2. 2、原创力文档(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
  3. 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  4. 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
Appraising levels of soil contamination and pollution with heavy metals Introduction Heavy metals are chemical elements, common to all kinds of soils, and their abundance ranks between percentage (Fe only) and parts per million. The very low general level of their content in soils and plants, as well as the biological role of most of these chemical elements, has led to them being grouped under the generic name of “microelements”. When the soil has very high contents of such chemical elements, the term “heavy metal pollution” is used. In some areas, the contents of these elements in soil are higher than the maximum concentration which has a beneficent or harmless effect on vegetation. R. Lacatusu Research Institute for Soil Science and Agrochemistry, Bd. Marasti 61, RO-71331 Bucharest 32, Romania The content of heavy metals in soil can reach levels that inhibit the normal growth and development process of plants, and cause functional disturbance in other environmental components. These very high contents may be of geogenic or anthropogenic nature. The negative effect of heavy metals depends on the percentage weight of their concentration as well as on a series of physical and chemical soil specific characteristics, such as: texture, organic matter content, pH, redox potential, etc. In order to interpret the level of soil heavy metals, only their content values have been initially considered: values analytically determined both in normal soils not affected by anthropic impact, and in affected soils. Then values representing the maximum allowable limits (MAL) of concentration of heavy metals in soils have been established, mainly applicable to growth and development of plants. Such MAL have been established by Kloke (1980) in Germany, according to the results obtained from laboratory, greenhouse and field experiments (Table 1). Later, some of these thresholds were changed (Kloke and Einkmann, 1991, quoted by Kabata-Pendias, 1995), some of th

您可能关注的文档

文档评论(0)

bgl001 + 关注
实名认证
内容提供者

该用户很懒,什么也没介绍

1亿VIP精品文档

相关文档