Abstract
A method for measuring trace concentration of Fe, Co, Ni, Cu, Zn and Pb in plant materials was developed, optimized, validated and compared using reference standards and fresh samples. The method is based on rapid material digestion by radicals produced with laser-assisted pulsed UV (PUV) photolysis of aqueous solutions containing H2O2. Metals in the resulting solution were pre-concentrated as carbamates. Samples were analyzed with particle induced X-ray emission (PIXE). Combined PUV digestion and pre-concentration techniques resulted in enhanced detection levels of selected trace elements in foods and non-food commodities. The method was applied to measure trace elements in wastewater irrigated fruits, vegetables and crops.
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