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Distribution of Arsenic (soil and Water) in Gangetic Flood Plain

Dr. Md. Shahjahan Kabir
CSO and Head
Agricultural Statistics Division, BRRI

Dr. Md. Ismail Hossin
SSO
Agricultural Statistics Division, BRRI

Abstract/ Executive Summary:

The average As content in grain was 0.31 mg/kg at command area level and at upazila level it was 0.40 mg/kg, while groundwater As level was 178.6 ppb and 126.3 ppb, respectively. Out of 490 upazila 68 are at high risk, 103 are at medium risk, 130 are at low risk and 189 upazila are risk free. About 46% of the total area of Bangladesh As concentration is below 10 μg l^-1. Approximately, 72% area of Bangladesh arsenic concentrations is within 50 μg l^-1. About 14% area of Bangladesh appears it low As risk with arsenic concentrations in water between 50 μg l^-1to 100 μg l^-1. About 9% area falls under medium risk and about 6% under high risk.

Keywords: Arsenic, Irrigation, Boro rice

Location: Different area of Bangladesh

Start Date: 00-00-2011

End Date: 00-00-2012

Program Area: Risk Management in Agriculture

Non-commodity: Ecosystem mapping

Objectives:

To delineate arsenic risk and save areas for irrigated rice cultivation in Bangladesh.

Methodology:

Digital Elevation Map (DEM) was used to identify the low elevated areas in Bangladesh. Land type, Flash flood and Tidal data were overlaid with DEM to find the actual submergence area which may be used for rice cultivation. Date of initiation, recession and depth of flood were analyzed to determine the areas suitable for BRRI varieties. To authenticate the results ground trusting was done. ARCVIEW Spatial Analyst 3.2 were used for GIS analysis and constructing the maps.

Source of Information: BRRI Annual Report 2012-13,214-216,BRRI, Gazipur.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

About 99% of the people eat huge amount of rice as their main food @455 gm/person/day and water about 800 ml/day/person. The average As content in grain was 0.31 mg/kg at command area level and at upazila level it was 0.40 mg/kg, while groundwater As level was 178.6 ppb and 126.3 ppb, respectively.

Out of 490 upazila 68 are at high risk, 103 are at medium risk, 130 are at low risk and 189 upazila are risk free. About 46% of the total area of Bangladesh As concentration is below 10 μg l^-1. Approximately, 72% area of Bangladesh arsenic concentrations is within 50 μg l^-1. About 14% area of Bangladesh appears it low As risk with arsenic concentrations in water between 50 μg l^-1to 100 μg l^-1. About 9% area falls under medium risk and about 6% under high risk.
High As risk areas lie in the south-east to south-central regions in Bangladesh. Medium As risk areas spreads all over the country but more concentrated in south-west region to south-central and south-east regions. Low risk groundwater As contaminated areas spread all over the country as pockets.

Knowledge Management: Report/Proceedings