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The total concentration of zinc, iron, nitrogen and phosphorus, as well as their water and acetic acid extractable forms - nitrate nitrogen, ammonium nitrogen and phosphate phosphorus - were determined in st. John's wort herb (Hypericumperforatum L.) yarrow herb (Achillea millefolium L.), nettle leaves (Urtica dioica L .) and birch leaves (Betula pendula Roth.), collected from four natural locations...
The concentration of total iron and iron (II ) extracted by hot twice distilled water was analyzed in following medicinal plants collected from natural areas: St Johns wort (Hypericum perforatum L.), yarrow (Achillea millefolium L.), nettle (Urtica dioica L.) and birch (Betula pendula Roth.). Total iron was determined by FAAS method after microwave mineralization of samples, whereas Fe (II ) was extracted...
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