Geofractionation of heavy metals and application of indices for pollution prediction in paddy field soil of Tumpat, Malaysia

Sow, Ai Yin; Ismail, Ahmad; Zulkifli, Syaizwan Zahmir

doi:10.1007/s11356-013-1857-9

Cited by 10 publications

(5 citation statements)

References 37 publications

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“…However, like the most resource-based cities, with the exploitation of resources and the gradual reduction of resource reserves, mining zones whose developments mainly depend on their own resources are facing downfalls[ 3 ]. In the meantime, abandoned mines, land subsidence, water pollution, hills of gangue and flyash by years of industrial and mining production in these cities cause the destruction and waste of resources, ecological degradation, and damage to the environmental landscape[ 4 ]. The transition of resource-based cities has become an irreversible trend in Northeast China.…”

Section: Introductionmentioning

confidence: 99%

Spatial Patterns and Risk Assessment of Heavy Metals in Soils in a Resource-Exhausted City, Northeast China

Chen

Wei

et al. 2015

PLoS ONE

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Northeast China is an intensive area of resource-exhausted city, which is facing the challenges of industry conversion and sustainable development. In order to evaluate the soil environmental quality influenced by mining activities over decades, the concentration and spatial distribution of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni), lead (Pb), and Zinc (Zn) in surface soils (0-20cm) of a typical resource-exhausted city were investigated by analyzing 306 soil samples. The results showed that the average concentrations in the samples were 6.17 mg/kg for As, 0.19 mg/kg for Cd, 51.08 mg/kg for Cr, 23.27 mg/kg for Cu, 31.15 mg/kg for Ni, 22.17 mg/kg for Pb, and 54.21 mg/kg for Zn. Metals distribution maps produced by using the inverse distance weighted interpolation method and results revealed that all investigated metals showed distinct geographical patterns, and the concentrations were higher in urban and industrial areas than in farmland. Pearson correlation and principal component analysis showed that there were significant positive correlations (p<0.05) between all of the metals, and As, Cd, Cr, Mn, Ni, Pb, and Zn were closely associated with the first principal component (PC1), which explained 39.81% of the total variance. Cu and As were mainly associated with the second component (PC2). Based on the calculated Nemerow pollution index, percentage for slightly polluted (1

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Section: Introductionmentioning

confidence: 99%

Spatial Patterns and Risk Assessment of Heavy Metals in Soils in a Resource-Exhausted City, Northeast China

Chen

Wei

et al. 2015

PLoS ONE

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“…For each heavy metal used the experiments were carried out in triplicate. Medium without the addition of heavy metals was used as control (Sow et al, 2013). The medium was incubated using a shaker incubator (150 rpm) at 37 o C. Carbofuran concentration was taken every six hours until the reduction of Carbofuran was observed.…”

Section: Heavy Metals Effect On Biodegration Of Carbofuranmentioning

confidence: 99%

The effect of heavy metals on biodegradation of carbofuran by microbial strain enriched from Agricultural areas

mustapha

Halimoon

2022

African Journal of Biological Sciences

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The effect of heavy metals on the degradation of carbofuran by immobilized bacterial cells was checked by culturing in the MSM medium at 37 o C in the presence of 0-1 mg/L of heavy metals. Bioremediation systems represent a biologically sustainable means to degrading organic pollutants such as carbofuran insecticide, with little energy demand and operational expenses in addition to high efficiency and substrate specificity. Nonetheless, heavy metals present in the agricultural lands may thwart the process efficiency by poisoning carbofurandegrading microbial isolates. Therefore, we experimentally tested the tolerance of carbofurandegrading immobilizedbacterial isolated from vegetable plantation area for mercury (Hg) and copper (Cu). The results indicated that the tested metals inhibited carbofuran biodegradation to different extents, depending on concentration. At pH 7.0 and 37°C, complete inhibition of carbofuran biodegradation by Hg occurred at 0.4, 0.5, 0.6 and 0.7 mg/L. Lower concentrations of these metals decreased the rate of carbofuran− biodegradation, with relatively long lag times. Interestingly, the immobilize isolate tolerated higher concentrations, although both the rate and extent of carbofuran− biodegradation were affected.

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“…The bacteria (free or immobilized) were inoculated into the MSM medium supplemented with 1 mg/L of each heavy metal. Medium without the addition of heavy metals was used as control [55]. The culture was incubated using a shaker incubator (150 rpm) at 37 • C. Bacterial growth was measured by taking the OD 600 for free cells.…”

Section: Effect Of Heavy Metals On the Degradation Of Carbofuran By Enterobacter Sp Brc05mentioning

confidence: 99%

Enhanced Carbofuran Degradation Using Immobilized and Free Cells of Enterobacter sp. Isolated from Soil

et al. 2020

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Extensive use of carbofuran insecticide harms the environment and human health. Carbofuran is an endocrine disruptor and has the highest acute toxicity to humans than all groups of carbamate pesticides used. Carbofuran is highly mobile in soil and soluble in water with a lengthy half-life (50 days). Therefore, it has the potential to contaminate groundwater and nearby water bodies after rainfall events. A bacterial strain BRC05 was isolated from agricultural soil characterized and presumptively identified as Enterobacter sp. The strain was immobilized using gellan gum as an entrapment material. The effect of different heavy metals and the ability of the immobilized cells to degrade carbofuran were compared with their free cell counterparts. The results showed a significant increase in the degradation of carbofuran by immobilized cells compared with freely suspended cells. Carbofuran was completely degraded within 9 h by immobilized cells at 50 mg/L, while it took 12 h for free cells to degrade carbofuran at the same concentration. Besides, the immobilized cells completely degraded carbofuran within 38 h at 100 mg/L. On the other hand, free cells degraded the compound in 68 h. The viability of the freely suspended cell and degradation efficiency was inhibited at a concentration greater than 100 mg/L. Whereas, the immobilized cells almost completely degraded carbofuran at 100 mg/L. At 250 mg/L concentration, the rate of degradation decreased significantly in free cells. The immobilized cells could also be reused for about nine cycles without losing their degradation activity. Hence, the gellan gum-immobilized cells of Enterobacter sp. could be potentially used in the bioremediation of carbofuran in contaminated soil.

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Geofractionation of heavy metals and application of indices for pollution prediction in paddy field soil of Tumpat, Malaysia

Cited by 10 publications

References 37 publications

Spatial Patterns and Risk Assessment of Heavy Metals in Soils in a Resource-Exhausted City, Northeast China

Spatial Patterns and Risk Assessment of Heavy Metals in Soils in a Resource-Exhausted City, Northeast China

The effect of heavy metals on biodegradation of carbofuran by microbial strain enriched from Agricultural areas

Enhanced Carbofuran Degradation Using Immobilized and Free Cells of Enterobacter sp. Isolated from Soil

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