Science Links Japan | For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Geochemical compositions of sediments of Ganges delta of Bangladesh-arsenic release from the peat?

For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Geochemical compositions of sediments of Ganges delta of Bangladesh-arsenic release from the peat?

Accession number;00A0386821

Title;For elucidating the mechanism of arsenic contamination of groundwater in Asia with special reference of research in Bangladesh. Geochemical compositions of sediments of Ganges delta of Bangladesh-arsenic release from the peat?

Author; YAMAZAKI CHIKAKO (Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN) ISHIGA HIROAKI (Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN) DOZEN KAORI (Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN) HIGASHI NAOKO (Shimane Univ., Faculty of Live and Environmental Sci. JPN) SAMPEI YOSHIKAZU (Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN) AHMED F (Shimane Univ., Interdisciplinary Faculty of Sci. and Engineering, JPN) RAHMAN M H (Univ. Rajshahi, Rajshahi, Bgd) ISLAM M B (Univ. Rajshahi, Rajshahi, Bgd)

Journal Title;Earth Science

Journal Code:F0193A

ISSN:0366-6611

VOL.54;NO.2;PAGE.81-93(2000)

Figure&Table&Reference;FIG.11, TBL.2, REF.17

Pub. Country;Japan

Language;Japanese

Abstract;Major and trace elements, and TOC (total organic carbon), TN (total nitrogen) and TS (total sulfur) of the sediments collected in 1999 by 18 boring operations (about 15 m depth by PRC: Percussion Reverse Circulation method), in Samta and Deuli Villages (east of Samta Village), Bangladesh were analysed to reveal mechanisms of arsenic contamination in groundwater. Relatively higher concentration of arsenic (50 ppm) from the organic black muds and 262ppm from the peat of the Deuli sample were significantly high compared with those of the Samta samples (20ppm for the mud samples). Arsenic concentration shows good correlation with those of vanadium and copper, which is suggestive of close correlation of arsenic to organic matter. P2O5 concentration gradually increases toward the ground surface samples (over 0.2wt%) and distribution of such higher P2O5 concentration suggests contamination by domestic waste. Sulfur is detected in some samples from both Samta and Deuli Villages. TS/TOC ratios, however, are lower than 0.36 of an average of normal marine sediments, suggesting non-marine or brackish conditions for their sedimentary environments. TOC/TN ratios have an average value of 11.1 suggesting organic matter derivated from both higher plants and marine planktons. Higher contents of arsenic in sediments correlated well with organic matter (OM), that may indicate contamination of groundwater under reducing condition of the aquifer. Decomposition of OM seems to be stimulated by increasing agricultural practice and domestic waste, which accelerated dissolution of arsenic from the sediments, especially from the peat layer. (author abst.)

Related Articles;