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Seasonal Variation in Ionic Constituents of Waters in the Sundarbans Mangrove Forest

A.K.M. Faruk-E-Azam
Department of Agricultural Chemistry, Patuakhali Science and Technology University

K. Arifuzzaman
Department of Environmental Science Discipline, Khulna University

N.H. Khan
Regional Laboratory, SRDI, Farmgate, Dhaka-1215

H.A.K. Chowdhury
Regional Laboratory, SRDI, Farmgate, Dhaka-1215

.K.M.M. Alam Chowdhury
Regional Laboratory, SRDI, Farmgate, Dhaka-1215

Abstract/ Executive Summary:

Seasonal variation in ionic constituents of water at three locations (viz. Sorbatkhali, Adachi camp and Hiron point) in Khulna range of the Sundarbans mangrove forest was studied during March 2007 to November 2008 at the Bangladesh Agricultural University, Mymensingh. Water samples were analyzed for Ca, Mg, K, Na, Zn, Mn, Cu, Cd, Pb, S, B and Cl. The highest levels of all the nutrient ions except Cu and Cl were detected at Hiron point in both the summer and winter seasons. Both Cu and Cl were found maximum at Sorbatkhali in both the seasons. The concentrations of Mn, Cu, Cd, Pb and S found higher in summer; while Ca, Mg, K, Na, Zn, B and Cl were detected at higher levels in winter. The amount of most of the ions was decreased with distance from the sea beach point (Hiron point) with exception in case of Cu and Cl. The trend of ionic concentrations were Hiron point > Adachi camp > Sorbatkhali in both the seasons. Calcium was dominated over Mg amounting more than double in summer but in winter, vise-versa relation was observed. The mean amount of Ca, Mg, K, Na and B increased around 1.5, 5.0, 2.0, 4.0 and 2.0 times respectively in winter than summer. Remarkable seasonal variation was found in Ca, Mg, K, Na and B concentrations. The relationship between ionic constituents in both the seasons was established. In summer significant synergistic relationship was found among Ca-Cd, Ca-S, Ca-B, K-Cd, K-S, Na-Mn, Cd-S, Cd-B and S-B ions. Similar significant synergistic relationship was also found in winter. Significant antagonistic relationship was found between Cu-Pb ions in both the seasons.

Keywords: Seasonal variation, Ionic constituents, Sundarbans, Mangrove forest.

Location: Khulna range of the Sundarbans

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Crop-Soil-Water Management

Commodity: Water quality

Objectives:

1. To evaluate the seasonal variation in ionic constituents of water in the Sundarbans mangrove forest.

Methodology:

Collection of water samples: Water samples were collected from 3 selected locations in Khulna range of the Sundarbans in both the summer and winter seasons during 2007 to 2008. Techniques for water sampling were followed as outlined by Hunt and Wilson. Waters were collected in 500 ml plastic bottle which were previously cleaned with dilute hydrochloric acid and followed by distilled water. Before taking samples, the bottles were rinsed three times with water to be sampled. Water samples were drawn from few centimeters below the surface. The bottles were then caped, labeled and brought to the laboratory. The water samples were analyzed soon for different parameters. The water sampling locations were 1. Sorbatkhali, 2. Adachai camp and 3. Hiron point. Water analytical methods: Potassium and sodium were determined flame photometrically. Calcium, magnesium, zinc, copper, manganese, lead and cadmium were analyzed by atomic absorption spectrophotometer. Sulphur was analyzed turbidimetrically. Azomethine-H was used for colorimetric analysis of boron, Chloride was determined by argentometric titration.

Source of Information: J. Agrofor. Environ. 4 (2): 49-51, 2010; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In summer significant synergistic relationship was found among Ca-Cd, Ca-S, Ca-B, K-Cd, K-S, Na-Mn, Cd-S, Cd-B and S-B ions. Similar significant synergistic relationship was also found in winter. Significant antagonistic relationship was found between Cu-Pb ions in both the seasons. On the contrary in both the seasons some of the ions failed to reflect neither synergistic nor antagonistic relation. Poor or no remarkable relation was found between some ions, but the reasons are difficult to explain.

Knowledge Management: Journal