بررسی آلودگیبرنج هایوارداتی پر مصرف در شهر تبریز به آلاینده های فلزی کادمیوم، سرب و آرسنیک

Contamination by heavy metals is one of the major environmental problems and food safety concerns. rice, especially white rice (oryza sativa), is the most basic food in the diet of different individuals including asian countries and the second most consumed food among iranian peoples. the aim of the present study was to control and determinecadmium, lead and arsenic concentrations in the most consumed rice (oryza sativa) verities in tabriz(east azerbaijan province). for this purpose, 10 samples of the most consumed imported rice were purchased randomly from tabriz bazaar and after preparation, evaluation of cadmium, lead and arsenic concentrations were performed by pg-900 atomic absorption spectrophotometer in specific wavelengths and arsenometer. after gathering information, data were analyzed using sas statistical software and compared withnational standards. a significant differencewas observed between heavy metals contamination in rice samples (p < 0.01). results indicated that the mean concentrations of cadmium, lead and arsenic in rice samples were 0.109±0.157, 0.290±0.154 and 0.55±0.028 mg/kg dry basis, respectively. the mean concentrations of cadmium and lead in rice samples were noticeably higher than criteria of institute of standards and industrial research organization of iran. for assay the safety of dietary intake, weekly intake of heavy metals by rice was calculated based on the intake of a typical iranian person(whereas daily intake of rice is 165 g/person/day and average body weight is 60 kg/person). results revealed that weekly heavy metal intake from rice did not exceed the provisional maximum weekly intake recommended by who/fao.