Permissible ranges of Cadmium and Lead in organic manures used in food production
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Abstract
In Cuba, in order to find national alternatives for agricultural production maintenance, the production and use of organic manures of diverse origins is promoted. However, it is important to maintain a systematic follow-up of their contents in heavy metals (HM), since they can contaminate the food produced with them; as well as to have permissible values of HM in organic manures, which are not currently available in the country. The objectives of this work were to evaluate the cadmium (Cd) and lead (Pb) content in organic manures used for vegetable production and to determine ranges of permissible values of these metals in organic manures. HM extraction in the samples of soils, organic manures, substrates and vegetables studied was carried out with 9 mL of HNO3 and 3 mL of HCl using a microwave oven, according to USEPA 3051A methodology and determination by Optical Emission Spectrometry. The ranges 140-150 mg kg-1 for Pb and 2-3 mg kg-1 for Cd were established as permissible values for these metals in organic manures used in food production. Organic manures with high Cd and Pb contents cannot be used to prepare substrates for food production, especially vegetables, because they constitute contamination risks for human health.
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