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Articles by Gh.R. Jahed
Total Records ( 2 ) for Gh.R. Jahed
  M.A. Zazoli , Gh.R. Jahed , E. Bazerafshan , M.Hazrati and A. Tavakkoli
  Cadmium (Cd) is one of the most well-known environmental intoxicants to humans. Its entrance to food chain causes the serious damage in humans. One of the major sources 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 monitoring of Cadmium especially in rice eating countries. The aims of the present study were to determine of Cd contents in tarom rice and to assess Cadmium intake from rice. A total of 60 samples were collected from four areas of Qaemshahr region in Mazandaran province (North of Iran). The samples were collected in during harvesting of rice in filed. Rice samples were digested by acid digestion method and analyzed by atomic absorption spectrometer. To assess the daily intake of Cd by rice, from daily consumption of rice was calculated. The results showed that average concentration of Cd in rice was 0.41±0.17 mg kg-1 dry wt. Notably the Cd content in the rice samples was found to be upper the FAO/WHO Guidelines. Also weekly intake of Cd from rice was upper than the maximum weekly intake recommended by WHO/FAO.
  H. Mahvi , E. Bazrafshan and Gh.R. Jahed
  Chemical Oxygen Demand (COD) is an important parameter in water-pollution control analysis. COD often is used as a measurement of pollutants in wastewater and natural waters. The objective of this research was to compare the standard method (open reflux method) and ISO, 6060 method in COD measurement of standard solutions and water and wastewater samples. Solutions of KHP (Potassium hydrogen phthalate) with a theoretical COD of 500 and 1000 mg O2L-1 were used as stock standards. The COD values of standard solutions were determined by the standard method and ISO 6060 (1989) method. After comparison between two method results showed that there is significant difference (p< 0.05) only for two concentration (ThOD= 100,400 mg L-1). Both ISO 6060 method and standard method (open reflux method, 5220B) were used to determine the COD values of a variety of water and wastewater samples. Based on average of data from twice measurement, they showed agreeable results which obtained from both methods.
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