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Research Detail

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MUHAMMAD ZAMIR HOSSAIN
Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh

GAZI MD. AHSANUL KABIR
Department of Chemistry, Jagannath University, Dhaka-1100, Bangladesh

SHAMSHAD BEGUM QURAISHI
Chemistry Division, Atomic Energy Centre, P.O. Box 164, Dhaka-1000, Bangladesh.

Air, soil and water are continuously being polluted by the anthropogenic activities and sometimes by natural calamities. Among the three components, water pollution perhaps is the most important one. The contamination of water resources and biota is of major concern especially in industrialized countries because of the discharge of toxic, persistent and bio-accumulative substances from various sources. Household wastes dumped by the city dwellers contribute also to a great extent to the pollution of urban areas.

  Contamination; Lake waters; Metals; Inorganic pollutants
  Dhanmondi and Gulshan Lake, Dhaka
  
  
  Risk Management in Agriculture
  Contamination

The main objectives of this work were:

  1. to establish background levels for heavy metals and some anions in two lakes of the Dhaka city and
  2. to examine seasonal variability of the metals in lake waters.

Dhanmondi and Gulshan lakes are two fresh water man-made lakes located within the residential area of Dhanmondi and Gulshan, respectively. The investigated sites of Dhanmondi lake were DP1, DP2, DP3 and of Gulshan lake were GP1, GP2 and GP3. Water samples were collected into acid washed plastic containers by dipping the containers at 0.5 meter depth. For determination of all parameters, one litre well-washed high density polyethylene (HDPE) containers were used for collection of water samples. From the collected water samples of 500 ml was separated into another bottle and were preserved in a refrigerator after adding 2 ml HNO3. Standard reference materials SRM 1643d (trace elements in water) and SRM 1640 (trace elements in water) from National Institute of Standard and Technology (NIST), USA, were used to check the accuracy and precision of the analytical methods. Na, K, Ca, Mg, Pb, Cd, Co, Ni, Cu, Fe, Mn and Zn were measured in the water samples using AAS after digestion with HNO3; chloride, fluoride and cyanide were measured with ion selective electrode (ISE); sulfate and phosphate were measured by turbid metric and ascorbic acid method, respectively. Conductivity and pH were also determined in the water samples.

  Journal of Bangladesh Academy of Sciences, Vol.34, No.1, 89-93, 2010
  
Funding Source:
  

The study indicated that the levels of different toxic and essential elements, in most cases, were within the permissible limit. Although the concentrations were mostly below the established maximum permissible level, a systematic monitoring for toxic elements is recommended due to their potential high toxicity. The concentrations of Fe, Mn, CN-, PO4 3- were high in both the lakes indicating the necessity of further detailed investigation of these parameters and the extent of water quality impairment for use in domestic, bathing and drinking water purposes.

  Journal
  


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