Abstract
In the current study, the quality of ground water (GW) from an area of western part of Jorhat district of Assam (India) was assessed in order to ensure the safety of its use in irrigation and drinking purposes. The physico-chemical parameters of the collected GW samples were evaluated and compared the data with the Indian Standards (IS) for drinking purposes. The investigation was mainly emphasised on the evaluation of Water Quality Index (WQI) and different parameters for the quality measurement of water for drinking and irrigation purposes, respectively. Correlations among the physico-chemical parameters were evaluated through statistical analysis. The physico-chemical parameters revealed that almost all the parameters except iron were within the permissible limit. Arsenic was found to be present in few water samples in both seasons (pre and post monsoon). In both the seasons, the WQI of the majority of collected water samples were observed to be falling under the poor category for drinking. Almost all the collected water samples were found to be fit for irrigation purposes. However, based on sodium percentage (Na %), Kelly’s ratio (KR), and Magnesium ratio (MR), few of the water samples are classified to be doubtful and inappropriate for irrigation.
Highlights
In this world, clean and safe water for drinking is one of the important fundamental needs for the survival of human being on earth.[1]
From the Water Quality Index (WQI), it was observed that 1.5 % of the collected water samples were found to be excellent, 19.1 % good, 73.5 % poor, and 5.9 % to be of very poor quality for drinking in the pre-monsoon season
In the post-monsoon season WQI showed that 1.5 % of water samples were excellent, 14.7 % good, 80.9 % poor and only 2.9 % of water samples were found to be very poor for drinking .The probable reason for poor WQI in most of the water samples is due to the presence of more iron than the permissible limit
Summary
Clean and safe water for drinking is one of the important fundamental needs for the survival of human being on earth.[1]. Presence of many inorganic anions and oxy-anions in water such as AsO4- , AsO3-, F-, Cl-, HCO3-, SO42-, PO43-, NO3- in elevated amounts can deteriorate the quality of water Assessment of these ions in water is of utmost importance for safety of people and environment. 69 number of ground water samples from Saroocharai and Charaibahi Mouza (a unit of cluster of villages made for land revenue collection) in western sub urban fringe of Jorhat town of Jorhat District, Assam were collected for evaluation of quality to know about their usability for irrigation and drinking. The area under investigation has strong presence of both tea and oil industry It is a mix of urban, urban over growth, semi urban and rural localities where most of the people are dependent on ground water for drinking and domestic uses. Various parameters such as Sodium Adsorption Ratio (SAR), Sodium Percentage, Kelly’s Ratio (KR), Magnesium Ratio (MR), and Corrosivity Ratio (CR), Residual Sodium Carbonate (RSC) were evaluated to check the quality of the ground water for irrigation
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