Samples of grain and straw of cereals (wheat, rye) and samples of grasses taken from the cultivated fields and grassland of Lower Silesia were analysed for arsenic and mercury contents. In the majority of samples the levels of both elements did not exceed the limits specified in Polish literature. However, the samples of cereals and grasses derived from the Legnica subregion contained higher amounts of arsenic and mercury than those from other subregions of the Lower Silesia province. Of the plants compared, grasses showed considerably higher levels of trace elements than cereals (grain).

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