Heavy metal pollution of soils and crops in Northern Bohemiaстатья
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Аннотация:Heavy metal contamination of agricultural crops and soils was investigated during 1987-1992 in 5 selected regions of the Czech Republic which are differently polluted by industrial emissions. The monitoring network included nearly 200 individual plots situated in the 5 above mentioned regions. Agrolandscapes, soils and crops typical of Bohemia, were investigated. Seven heavy metals (HM) (Cd, Pb, Hg, Co, Cr, Ni and Zn) and As were determined. Heavy metal and As concentration in crops and soils were compared to the contaminant values from Czech state standards. A summary of the results shows that the relationship between HM and As contamination of the plants and soils is possibly complicated due to emmission effects. In most cases both the degree of total contamination and the pollutant elements in the crops differed from pollution in the respective soils. In spite of a low degree of soil contamination in the regions examined (< 10%), the HM and As contamination of agricultural crops is very high (from 3-16% contaminated samples in the case of fodder crops, to 49-86% contamination of food crops). (C) 1996 Elsevier Science Ltd.