Study on Physico-Chemical Properties of Rain Water, Ground Water and Pond Water in KUET Premises

Abstract

Six samples of pond water, four samples of rain water and four samples of ground water were collected from the KUET premises. The sampling of pond water has been made during the period Nobember, 2013 to April 2014, while the rain water samples were collected during the late rainfall in the month of September. The rain samples were mounted 1.5 meters above the ground to avoid rain splash as recommended Pond water samples were collected by grab-sampling method. All sample's were filtered and preserved at 200 C. Some water parameters such as Alkalinity, Hardness, TDS, Arsenic, pH, Turbidity, Conductivity & Salinity were measured. Four tube well water samples were collected from different location of KUET residential area. The pH of tube well water ranged from a minimum of 7.79 to a maximum of 8.2 of TW3 (Tube well water, collected from building no 12) and 1W1 (Tube well water, School gate KUET) respectively. Similarly the variation of pH of pond water ranged from a minimum of 8.40 to a maximum of 8.87 of PWL1 (Pond water lower Position, Rokaya hail) and in rain water the maximum value was 6.77 of RWJ1 (Rain water from jessore urban) and the minimum value was 6.34 of RWC (Rain water collected from Chittagong) respectively. The values of conductivity for all tube well water were found to be greater than those of pond water and rain water. In present observations the conductivity for tube well water ranges from 1021 to 1598 ts/cm, for pond water ranges 324 to 732 p.s/cm and for rain water ranges from 13 to 80 J.ls/cm. It indicates that the tube well water contain larger quantity of dissolved mineral salts. In case of pond water, the conductivity is also significantly change during winter season and rainy season. The total dissolved solids (TDS) of tube-well water ranged from a minimum of 551 rng!L to a maximum of 887 mg/L of TW1 (Tube-well, School gate) and TW4 (Tube well water,collected from building no 19) respectively. Similarly the variation ctotal dissolved solids of pond water ranged from a minimum of 175 mg/L to a maximum of 399 mg/L of PWL 1 (Pond water, lower Position Rokaya hail) and PWL2 (Pond water, lower Position power plant side pond) and for rain water ranged from a minimum of 6 mg/L to a maximum of 40 mg/L of RWC (Rain Water, Collected from Chittagong) and R\VK (Rain Water, Collected from Khulna) respectively. This high values of TDS (Total dissolved solids) specially in Tube well water are mainly due to carbonates, bicarbonates, chlorides, phosphates and nitrates of calcium, magnesium, sodium, potassium and manganese. The variation in total alkalinity of tube-well water ranged from a minimum of 496.66 mg/L to a maximum of 508.33mg!L of TW2 (Tube well water, collected from building no 5) and TW3 (Tube well water, collected from building no 12) respectively . Similar variation in total alkalinity of pond water ranged from a minimum of 83.33 mg/L to a maximum of 131.66 mg/L of PWL1 (Pond water, lower Position Rokaya hail) and PWU3 (Pond water, collected from upper Position Khan Jahari Ali Hall) respectivcly. Tube-well water samples have found the iron content and the results varied from 16.78 27.97 ppm. No tube-well was found having the iron content within the maximum permissible limit of 1.0 ppm. Lead and cadmium concentration in the rain water was found below the detectable limit. Arsenic was investigated to all tube well water and found below 0.02 ppm that is within acceptable limit.