Volume No. 13 Issue No.: 02 Page No.: 125-135 October-December 2018

 

PERVASIVENESS OF GROUNDWATER ARSENIC IN FOUR GEOGRAPHICAL ZONES ACROSS LONGAI AND KUSHIARA RIVERS IN KARIMGANJ DIST -RICT, BARAK VALLEY, ASSAM INDIA : RELATES TO RIPARIAN AQUIFER PH

 

Kanungo Tushar Deb

: Department of Chemistry, Gurucharan College, Silchar, (INDIA)
: Centre for Advanced Studies and Innovation Lab, 18/27, Kali Mohan Road, Tarapur, Silchar, (INDIA)

 

Received on : January 09, 2018

 

ABSTRACT

 

Recently arsenic has been detected in the groundwater of Karimganj district, Barak Valley, Assam, India. In this regard, a research work of estimation of arsenic, as well as earmarking of the arsenic loaded surficial area, has been undertaken in the four geographical zones across the Longai and Kushiara rivers of this district. 24 groundwater samples have been taken as representative from borewells of four zones and are analysed during the year 2016. Analyses are initially done by Ag-DDTC method and subsequently justified by an FI-HG-AAS method. The locations of samplings are recorded by GPS. Quantification by two different methods shows that the southern Longai Valley has the lowest level of individual arsenic ranging 0-3.4 ?g/L. The northern Longai Valley experiences the pollution of arsenic with a span of 50 62?g/L and 54 - 98?g/L measured in respective methods. While it ranges 0 85 and <3 - 113?g/L on the southern bank of R. Kushiara near Bhanga which is far above the guideline concentration of 10 ?g/L. pH ranges between 5.9 and 8.3 in this riparian area and has a negative correlation with arsenic. Three of the four zones of the district characterized by alluvium soil are found to be arsenic infested. This situation demands a regular survey of water quality to prevent health risks. The communication of these findings will generate heightened awareness among the consumers and help them to explore alternative sources.

 

Keywords : Arsenic, Quantification, Longai, Kushiara, Riparian, Alluvium soil

 

 

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