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North Lakhimpur, India

Kakati S.S.,Lakhimpur Girls College
Nature Environment and Pollution Technology | Year: 2012

Heavy metals in water have severe toxicity towards aquatic life and human beings. In north-eastern region of India, increasing rate of heavy metal content in drinking water has become a matter of serious concern as it has adverse health affects at high concentration. Many researchers have already studied high concentration of arsenic and heavy metals in different districts in this region. In Lakhimpur district of Assam in India, no detailed study about arsenic and heavy metals in drinking water has been done till now. In order to assess the concentration of heavy metals in drinking water of Lakhimpur district of Assam, twenty locations were selected for the study. The analysis was carried out for three years from June 2005 to May 2008 covering four seasons in a year. Metals studied in the present investigation were Zn, Pb, Ni, Cu and As. From the analytical data, it was found that Cu and Zn concentration was within ISI permissible limit. The all season average values of Ni in all the sampling points were found within 0.1mg/L. Pb concentration was found to be at a higher level in almost all the sources. In 5% samples As content exceeded ISI limit of 0.05mg/L. Seasonal variations were also observed and high values were detected in monsoon season. Health survey in the district were also done with the help of a pre-prepared questionnaire and the over all health status was found to be not satisfactory. Most of the people in the district suffered from mild to severe gastrointestinal diseases. Though, arsenic concentration was high in a few locations, no case of arsenocosis has been reported till date.

Kakati S.S.,Lakhimpur Girls College
Nature Environment and Pollution Technology | Year: 2010

The quality of water varies widely with respect to its various uses, and the water quality suitable for one purpose may not be satisfactory for the other. Statistical studies have demonstrated significant inverse relationship between cardiovascular disease (CVD) mortality and water hardness even when the environmental and socioeconomic factors are taken into account The evidence that drinking water quality affects cardiovascular disease has been strengthened by recent research which has shown that very soft water increases CVD and mortality rates by 10%. Keeping this view in mind the assessment of water hardness of this region along with some polyvalent cations (Ca, Mg, Fe) has been carried out for three different seasons in a year. The study reveals that water quality in the study area falls under moderately hard (60-120mg/L) and hard (120-180mg/L). Also it was found that Fe content in the study area was very high as compared to the WHO value of safe drinking water, while other parameters (Ca, Mg) were within the WHO limit.

Mridulburagohain,Lakhimpur Girls College | Bhuyan B.,North Lakhimpur College | Sarma H.P.,Gauhati University
Journal of Environmental Science and Engineering | Year: 2010

The primary objective of this study is to present a statistically significant water quality database of Dhemaji district, Assam (India) with special reference to pH, fluoride, nitrate, arsenic, iron, sodium and potassium. 25 water samples collected from different locations of five development blocks in Dhemaji district have been studied separately. The implications presented are based on statistical analyses of the raw data. Normal distribution statistics and reliability analysis (correlation and covariance matrix) have been employed to find out the distribution pattern, localisation of data, and other related information. Statistical observations show that all the parameters under investigation exhibit non uniform distribution with a long asymmetric tail either on the right or left side of the median. The width of the third quartile was consistently found to be more than the second quartile for each parameter. Differences among mean, mode and median, significant skewness and kurtosis value indicate that the distribution of various water quality parameters in the study area is widely off normal. Thus, the intrinsic water quality is not encouraging due to unsymmetrical distribution of various water quality parameters in the study area.

Buragohain M.,Lakhimpur Girls College | Sarma H.P.,Gauhati University
Environmental Monitoring and Assessment | Year: 2010

Seasonal variations in the concentrations of groundwater with respect to arsenic, lead, cadmium and aluminium has been studied in Dhemaji district of Assam, India. The water samples were collected from 20 different sites in both dry and wet seasons. The metals were analysed by using atomic absorption spectrometer, Perkin Elmer AAnalyst 200 model. The concentrations of aluminium, lead and cadmium in groundwater were found to be significantly elevated. High concentrations of all the metals were recorded in the dry season than in the wet season. Univariate statistics along with skewness, kurtosis and confidence limit have been calculated for both the seasons to test the distribution normality for each metal. Statistical analyses of the data reveal non-uniform distribution of the metals in the area. The metal contamination of groundwater in the district follows the trend Al > Pb > Cd > As in both the seasons. © 2009 Springer Science+Business Media B.V.

Hazarika L.P.,North Lakhimpur College | Baruah D.,Lakhimpur Girls College | Dutta R.,Lakhimpur Girls College
Nature Environment and Pollution Technology | Year: 2010

Critically endangered Ganges River Dolphin {Platanista gangetica gangetica Roxb.) is found in substantial numbers in the downstream of Subansiri river, a major tributary of the River Brahmaputra. Best estimates of 21,23 and 26 dolphins were recorded in 2005-06, 2006-07 and 2007-08 respectively. Until recently, the Subansiri river was considered one of the safe havens for residential dolphin due to relatively healthy downstream environment coupled with awareness of river bank inhabitants. Water environment of the un-damming Subansiri river strongly influence the existence of dolphin population. However, compositional changes of their distribution may have occurred after regulation of the river by the 2000 MW Lower Subansiri Hydroelectric Projects, whose construction has begun. Only 25 cumec/sec water will be released to the downstream after operation of the project against the present minimum flow discharge of 188 cumec/sec. This huge irreversible reduction (87.60%) in water discharge will make the downstream extremely vulnerable for this lUCN's red listed mammal, the dolphin. Flushing of reservoir sediment will accelerate the degradation by increasing, decreasing the riverbed and water table respectively. To protect the ecological and social security of the downstream, in general, and Ganges dolphin in particular, the minimal environmental flows for long term sustaining of the recently declared India's national aquatic animal is to be calculated and executed accordingly.

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