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Alumnium and Silicon Concentrations in Some Lake Waters of Bangladesh

SHAMSHAD BEGUM QURAISHI
Chemistry Division, Atomic Energy Centre, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

A study on Aluminium (Al) and Silicon (Si) in different Lake waters in different seasons around Dhaka city was carried out using Inductively Coupled Plasma-Atomic Emission Spectrophotometry (ICP-AES). The highest concentration of Si was found in March and lowest was in August in case of all the Lakes and Si concentration decreased in the order of Rupnagar Lake > Gulshan Lake > Ramna Lake > Dhanmondi Lake. On the other hand, in some cases, comparatively higher concentrations of Al were found in March and then these decrease in June and again increase in August indicating these lakes may be getting contamination during rainy season. Among the four Lakes, Al concentration decreased in the order of Dhanmondi > Ramna > Gulshan > Rupnagar. This may be due to the formation of hydroxyaluminosilicate at high total silicon concentration. It is also notable that the level of Al in these four Lakes is much higher than the Bangladesh drinking water standard for Al.

Keywords: Lake water, Seasonal variation, Aluminium and silicon, ICP-AES

Location: Lake waters around Dhaka City

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Contamination

Objectives:

The present paper deals with the study on the seasonal variation of Al and Si in some Lake waters around Dhaka City using Inductively Coupled Plasma-Atomic Emission Spectophotometry (ICP-AES) and the effect of silicon concentration on aluminium bioavailability.

Methodology:

Reagents: The acids used were of extra-pure grade and deionized water used throughout the preparation of standard, samples and blank had an electrical conductivity less than 1µS/cm². Al and Si standards (1000 ppm) were obtained from SPEX Certiperp, Inc. (NJ,USA). The ICP-AES was calibrated by preparing calibration standard solutions from the stock standard solutions and SRM 1640 and 1643d were used to check the accuracy and precision of the analytical method. Standard reference materials were purchased from National Institute of Standards and Technology (NIST), USA. Sample collection. Water samples (2L) were collected in a precleand (acid washed) polyethylene bottles form the four lakes in Dhaka city at three different locations of each lake during four seasons e.g., March, June, August and November during the period of November, 2003 to August, 2004. Lakes selected were Dhanmondi, Gulshan, Rupnagar and Ramna. Collected samples were filtered through the Whatman-41 filter paper. Analytical methodology and quality assurance: For the analysis of Al using ICP-AES JY 2000, hot plate digestion was used to digest and preconcentrate samples about 10 times. As part of the quality control protocol, analysis of reagent blank and certified reference material SRM 1640 (trace elements in water) and SRM 1643d (trace elements in water) were carried using ICP-AES. The results of the analysis of SRMs were well in agreement with NIST certified values.

Source of Information: Journal of Bangladesh Academy of Sciences, Vol. 32, No. 1, 33-39, 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest concentration of Si was found in March and lowest was in August in case of all the Lakes and Si concentration decreased in the order of Rupnagar Lake > Gulshan Lake > Ramna Lake > Dhanmondi Lake. On the other hand, in some cases, comparatively higher concentrations of Al were found in March and then these decrease in June and again increase in August indicating these lakes may be getting contamination during rainy season.

Knowledge Management: Journal