Distribution and changes in heavy metal contents of paddy soils in different physiographic units of Bangladesh

Ali, Mir Mohammad; Ishiga, Hiroaki; Wakatsuki, Toshiyuki

doi:10.1080/00380768.2003.10410042

Cited by 14 publications

(5 citation statements)

References 20 publications

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“…25 Total Cu (0.92 mmol kg −1 ) and Cd (<0.01 mmol kg −1 ) concentrations were in the range of background values reported for Bangladeshi paddy soils. 30 The amount of sulfate available for anaerobic microbial respiration was 2.09 mmol kg −1 (NaHCO 3 extraction), which is within the range of mean concentrations reported for paddy soils from several countries. 20 A more detailed description of the field site and of soil properties is given elsewhere.…”

Section: ■ Introductionsupporting

confidence: 78%

“…The soil had a silty clay loam texture and a weakly acidic pH of 6.2 (in 10 mM CaCl 2 ) and contained 2.3% organic carbon . Total Cu (0.92 mmol kg –1 ) and Cd (<0.01 mmol kg –1 ) concentrations were in the range of background values reported for Bangladeshi paddy soils . The amount of sulfate available for anaerobic microbial respiration was 2.09 mmol kg –1 (NaHCO 3 extraction), which is within the range of mean concentrations reported for paddy soils from several countries .…”

Section: Methodssupporting

confidence: 55%

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Redox-Controlled Changes in Cadmium Solubility and Solid-Phase Speciation in a Paddy Soil As Affected by Reducible Sulfate and Copper

Fulda

Voegelin

Kretzschmar

2013

Environ. Sci. Technol.

250

102

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The solubility of Cd in contaminated paddy soils controls Cd uptake by rice, which is an important food safety issue. We investigated the solution and solid-phase dynamics of Cd in a paddy soil spiked with ∼20 mg kg(-1) Cd during 40 days of soil reduction followed by 28 days of soil reoxidation as a function of the amounts of sulfate available for microbial reduction and of Cu that competes with Cd for precipitation with biogenic sulfide. At an excess of sulfate over (Cd + Cu), dissolved Cd decreased during sulfate reduction and Cd was transformed into a poorly soluble phase identified as Cd-sulfide using Cd K-edge X-ray absorption spectroscopy (XAS). The extent of Cd-sulfide precipitation decreased with decreasing sulfate and increasing Cu contents, even if sulfate exceeded Cd. When both Cu and Cd exceeded sulfate, dissolved and mobilizable Cd remained elevated after 40 days of soil reduction. During soil reoxidation, Cd-sulfide was readily transformed back into more soluble species. Our data suggest that Cd-sulfide formation in flooded paddy soil may be limited when the amounts of Cd and other chalcophile metals significantly exceed reducible sulfate Therefore, in multimetal contaminated paddy soils with low sulfate contents, Cd may remain labile during soil flooding, which enhances the risk for Cd transfer into rice.

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Section: ■ Introductionsupporting

confidence: 78%

Section: Methodssupporting

confidence: 55%

Redox-Controlled Changes in Cadmium Solubility and Solid-Phase Speciation in a Paddy Soil As Affected by Reducible Sulfate and Copper

Fulda

Voegelin

Kretzschmar

2013

Environ. Sci. Technol.

250

102

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“…Cr (III) is less toxic than the hexavalent cation (Cr VI), but Cr (VI) is formed in the presence of manganese oxides at the soil surface. Chromium levels in soil have been particularly high in the Surma-Kushiyara flood plain, and there have been rising concentrations in the Ganges flood plain near Faridpur (Ali et al, 2003).…”

Section: Tanneries and Slaughter Premisesmentioning

confidence: 99%

Recent Concerns about the Environment in Bangladesh

Gregory¹,

Biswas²,

Chowdhury³

2010

Outlook Agric

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Bangladesh is one of the poorest countries in the world and is affected by natural disasters, pollution and a range of public health hazards. The country's main environmental constraints are its susceptibility to seasonal flooding, inadequate sanitation and its limited infrastructure for wastewater management. Conversion of the Sundarbans to shrimp ponds and rice paddies has reduced the protection provided by this coastal strip. This, along with sedimentation in the western delta region, has increased the flood risk. High river flow rates during the monsoon in the centre and east of the Bay of Bengal are a threat to human and animal safety. Difficulties with installing and maintaining sanitation networks in flood-prone regions are causing pollution problems, and this has become more evident from recent reports about antibiotic-resistant strains of enteric pathogens in coastal shrimps and prawns. Pollution with sewage and wastewaters from the shrimp farming and leather industries are contributing to poor water quality in the rivers and delta. Difficulties in achieving immediate and adequate surveillance during the 2007 avian influenza outbreak may have compromised control standards for this disease. This article gives an overview of these and other environmental and health issues affecting the country.

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“…ICP analysis showed that Fe and Mn migrated into the treated wood, thereby giving rise to spectral interferences when a bench top X-ray spectrometer was used for the determination of just Cr, a timely reminder that methods for the determination of a single element may lull the analyst into a false sense of security. Ali et al 225 assessed the distribution in background levels of As, Cr, Cu, Mo, Ni, Pb, U, V and Zn using 66 archived surface paddy soil samples taken between 1967 and 1995 in Bangladesh. A Brazilian study 226 of XRF quantification methods for metals in sewage sludge reported several ways of introducing the carbon content into the fundamental parameter matrix correction calculation.…”

Section: Environmentalmentioning

confidence: 99%