Transfer of metals into the extracts of plant material | Metālu pāreja no augu izejvielām ekstraktos
2009
Korica, A., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Polis, O., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Daugavietis, M., Latvian State Forest Research Inst. Silava, Salaspils (Latvia)
The research results of investigations about extraction of metals from tree foliage into extracts are summarized. Samples of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) foliage (needles and non-wooden twigs) were extracted with solvents of diff erent polarity (water, ethanol and commercial non-polar solvent ''Nefrāze''), and content of metals was determined both in tree foliage and in extracts. Extraction levels of metals were determined calculating amounts of metals (Zn, Cu, Ni, Cd, Co and Pb) in 1 tree foliage mass unit and in extractives obtained from this tree foliage mass unit. The data indicates that extraction levels of metals depended on the solvents' polarity and was higher for water, lesser for ethanol and lowest for the non-polar organic commercial solvent ''Nefrāze''. Depending on the metal, water extracted 20-75% of the metals' content from tree foliage. The extracts obtained with ethanol and ''Nefrāze'' have a lower content of metals than those obtained by using water, and can be safely used even for tree foliage with high content of metals.
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