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Ground Water Quality of the BARInd Tract in Rajshaiu

S. K. Biswas
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

M. Alamgir
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

A. K. M. Sharif
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

Golam Rabbani
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

K. L. Chakraborty
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

A. K. M. Abul Hannan Bhuiyan
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

A. Mannaf
Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Ganakbari, Savar, P. 0. Box 3787, Dhaka, Bangladesh

Abstract/ Executive Summary:

Ground water samples were collected from twelve selected bore-holes at different locations In the Barind Tract of Rajshahi in order to determine the chemistry of these samples for 16 parameters.Water quality as determined from the chemical analyses of the samples. Collected from shallow (<30 m) and intermediate (30 - 100 m) aquifers, revealed that In both the Atral valley and Midland these aquifers contain low sodium water with moderate salinity. The aquifer in the Mahananda valley contains low sodium water with higher salinity.

Keywords: Ground water, Bartnd tract, Rajshahi Bangladesh

Location: Different locations in the Barind Tract, Rajshahi, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Groundwater

Objectives:

To the use of ground water in order to meet up the requirement of water for irrigation.

Methodology:

Twelve exploratory bore-holes were made upto depths varying from 100 to 150 meter by rotary drilling method. A large number of ground water samples were collected for necessary analyses from various depths of the bore-holes. The water sampler is a simple device having a 150 metre long electrical cable with a manually operated winch. The free end of the cable is fixed up with a stainless steel cylinder that has two parts. the bucket and the cap. The cap assembly contains a small motor and a nozzle that serves both as inlet and outlet of water. To open or shut the mouth of the nozzle the cap assembly can be operated electrically with the help of a controlling switch attached to the winch. Ni-Cd battery was used as the source of power. The cylinder was lowered down keeping the mouth of the nozzle shut. On reaching the desired depth for collection, the mouth was opened allowing time for filling up of water inside the bucket. The mouth was then shut again and the cylinder was lifted to the surface for collection of water sample. The sample bottles used for collecting water had earlier been treated with deionzed water. Each sample was divided and collected in two bottles, one being acid free for organic material determination and the other containing acid for determining cations. Various water samples. after collection, were immediately sent to the Nuclear Chemistry Laboratory. INST. AERE, Savar. Their physical appearance was observed. Whenever any suspended impurities were observed they were removed by filtration. These samples were kept in a refrigerator for subsequent analysis.All the reagents used for analytical purposes, were of pure grade and obtained from BDH (U. K) and E. Merck (Germany). In every experiment. double-distilled de-ionized water was used so as to avoid any contamination. pH values of various water samples were determined with a digital pH meter OP-211I 1 (Radelkis. Budapest). Electrical conductivities (EC) of these were recorded with a digital conductivity meter (Bibby SMC1 Conductivity Meter, J. Bibby, England). Total dissolved solid materials (TDS) of each sample was determined by evaporating 100 ml of the water sample in a platinum dish over a water bath. The amounts of metallic ions present in these samples were determined (USEPA 1979) by an atomic absorption spectrophotometer, using acetylene/air or nitrous/ acetylene gas mixture. The amount of sulphate was estimated gravimetrically (Rand 1977); and the chloride and nitrate by ion selective method (Rand 1977). Water soluble carbonates and bi-carbonates were determined volumetrically by using 0.1N H2 S04 in presence of phenolphthalein and methyl orange indicator (Rand I977). The determination of boron (B) in samples was carried out with a Pye-Unicam (Model No. SP-8-100) UV-spectrophotometer, using carmine initially and then curcumin was adopted (Rand 1977).

Source of Information: J. Aslat. Soc. Bangladesh. Sci. 22(1) : 57-63. 1996, ISSN 1016-6947

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The pH values of the samples varied from 6.25 to 7.34. Bangladesh Pollution Board has a recommended standard value (water quality, 1976) for pH, which is in between 6.5 and 9.2 for drinking water. ·There exists a wide variation with the values of EC. 248-866 µS cm^-1 and TDS, 180-498 mg/1 with these samples. Free carbon dioxide values were between 12-70 mg/1. It is observed that the ground water has generally an appreciable amount of sodium and potassium. The sodium concentration ranged from 23-100 mg/ 1. Higher values of sodium and potassium may be due to adverse environmental effect-of the Farakka barrage. This problem needs further detailed studies. Total dissolved solids (TDS) generally add up the total amou nt of all the dissolved constituents in water. The dissolved solid concentration in ground water of the area of study. ranged from 180 to 498 mg/ 1. Hence. there is a wide variation of TDS values in ground water samples of the study area. Taking the information together with the analytical data, it can be concluded that the quality of water of the study area is good for human consumption and also for agriculture.

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