Determination of lead and Cadmium Contents in (oryza sativa) rice samples of agricultural areas in Gillan- Iran
Journal Title: International Journal of Farming and Allied Sciences - Year 2013, Vol 2, Issue 11
Abstract
The major source of Cadmium intake for rice eating countries in Asian countries like Iran is rice. Due to the accumulation of heavy metal compounds formed in plants for food could be an important factor in human toxicity; we have been investigating the Cadmium and Lead contents in rice as the high daily intake in the north Iranian diet and high incidence of diseases among people in the north provinces in Iran. To assess the levels of Cadmium and Lead in Hashemi raw rice (Oryza Sativa), 100 samples after harvesting and 50 samples from one-year stored were randomly collected from 10 major rice production areas in 2012 .All samples were collected in during harvesting of rice in Gillan fields in two consequent years. Samples were analyzed by Atomic Absorption Spectrophotometer in 4 stages of : raw , rinsing , boiling & draining and cooking rice . Results were determined as mean ± SD of dry weight from three replicates in each test. The samples were analyzed by wet digestion method and standardized international protocols were followed for the preparation of material and analysis of heavy metals contents and analyzed by Atomic Absorption Spectrophotometer.The mean content of Cadmium and Lead in all samples had Cadmium and lead contents above maximum level which is recommended by FAO/WHO Expert Committee on Food Additives (JECFA) .Average concentrations of lead and cadmium in cooking rice is lower than boiling and draining rice and the results show that washing and rinsing rice has the significant role) in decreasing the cadmium and lead contents. Repetitive washing of the rice can greatly reduce level of heavy metal contents. The total dietary exposure levels of Lead and Cadmium determined in this study were compared with the provisional tolerable weekly intakes (PTWLS) by the JECFA and showed higher than it. Our results reveal that weekly Cadmium and lead intake from rice were higher than the maximum weekly intake recommended by WHO/FAO.
Authors and Affiliations
Parisa Ziarati, Sajad Arbabi, Sepideh Arbabi Bidgoli and Mahnaz Qomi
Keywords
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