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By rapid growth of population and development of societies, in addition to urban and agricultural water needs, other needs such as industry and power generation are increasing everyday (1). Water is vital for life and is the most important natural resources in the world. All living organisms, such as plants, animals and humans are depended on it and live in a place where water may exist (2). On the other hand, the contamination of water resources is expanding today. In addition to microbial contamination, chemical contamination of water is also one of the important issues which was discussed in the meantime and heavy metals have particular importance (1). Ground water contamination by pollutants such as heavy metals like chromium, nickel and manganese reduce the quality of this resource and make it unusable in some areas (3). Heavy metal pollution of water resources is due to agricultural activities, industrial and urban development in the last decade and has been one of the serious environmental problems (4). Studies on the crops that are irrigated with contaminated water showed heavy metals of contaminated water build up in these crops and through this enter in human food chain (3). The most fundamental question in relation to heavy metals is their metabolism in the body. In fact, heavy metal after entering the body, have not excreted from the body but accumulate in tissues such as fat, muscles, bones and joints. A-R-T-I-C-L-EI-N-F-O A-B-S-T-R-A-C-T Article Notes: Received: Aug 25, 2016 Received in revised form: Nov 20, 2016 Accepted: Dec 18, 2016 Available Online: Jan 1, 2017 Background & Aims of the Study: Heavy metals are one of the most important environmental pollutants which agricultural and industrial activities and urban development increased their entry rate to the underground resources. This study aimed to investigate the concentration of chromium, nickel and manganese in groundwater resources in Asadabad plain. Materials & Methods: Sampling of groundwater done in 2015 autumn. In this study, according to the Cochran’s sample size formula, tote formula, totally 60 samples of groundwater of Asadabad plain were collected from 20 wells and after preparation stage with atomic device, elements concentration of samples is read. To analysis of data SPSS 19 with significant level of 0.50 is used. Results: The concentration average of Chromium, Nickel and Manganese equal to 0.044¬ ±0.016, 70.42±10.83 and 2.64±0.83 ppb. The comparison results of the concentration average of elements based on WHO and ISIRI standard shows the concentration average of elements is lower than standard level. Conclusions: Currently the groundwater resources of Asadabad plain are not polluted with heavy metals, but long-term excessive use of agricultural inputs and construction of polluting industries can cause a threat to groundwater resources in this area.

Chromium, Nickel and Manganese in the Groundwater Resources of Asadabad Plain, Iran