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Investigation of cadmium content in Iranian rice (Oryza Sativa):
Maleki, Afshin; Zazoli, Mohammad Ali & Shokrzadeh, Mohammad
Abstract
Cadmium is one of the dangerous heavy metals which its presence in nature and entrance to
humans food chain, causes the serious damage in kidneys, lungs, bones, and also anemia and sometimes
hypertension. The major source of cadmium intake is rice for rice eating countries such as Iran. Cadmium in rice
comes from soil through plant roots. Thus, Rice may be the best indicator for the environment mentoring of
cadmium especially in rice eating countries. The most important sources of soil pollution to cadmium are
industrial sludge sewage discharge for increasing its fertility, applying superphosphate fertilizers and etc. At this
investigation surveyed Cd content of tarrom rice. A total of 60 samples were collected from four areas of
Qaemshahr region in north of Iran (Mazandaran province). The samples were collected in during harvesting of
rice in filed. The first step, grains of rice were digested by acid digestion method then were analyzed for cadmium
by atomic absorption spectrometer. The results showed that average concentration of Cd in rice was 0.41±0.17
mg/kg dry wt. Notably the Cd content in the rice samples was found to be upper the FAO/WHO Guidelines. We
concluded that a substantial exists in Cd contents in the rice of four areas and hence health risk is maximum and
this risk will increase to eating other foods such as vegetable, fish and etc and also the situation could worsen in
the future. Treatment and remediation of polluted soils and environment, decreasing easing of fertilizer using
could reduce Cd intake by plant and consequently health risk.
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