Arsenic fractions and enzyme activities in arsenic-contaminated soils by groundwater irrigation in West Bengal

Bhattacharyya, Pradip; Tripathy, Snehasis; Kim, Kangjoo; Kim, Seok-Hwi

doi:10.1016/j.ecoenv.2007.08.015

Cited by 94 publications

(51 citation statements)

References 27 publications

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“…Decrease in urease activity was noted after 15 days of incubation in soils treated with heavy metal-containing sludge (Kakhki et al, 2008). This inversely proportional relationship between urease activity and metal concentration has also been recorded by other authors, particularly from soils contaminated by As (Bhattacharyya et al, 2008), Cd, Pb and Zn (Kilzikaya et al, 2004;Liu et al, 2007;Mikanova, 2006). However, in other studies, urease activity was not found to be significantly correlated with microbial biomass and had varying responses to other metals (Alef et al, 1995;Kızılkaya et al, 2004).…”

Section: Ureasementioning

confidence: 57%

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Tipayno¹,

Chauhan²,

Woo³

et al. 2011

Korean Journal of Soil Science and Fertilizer

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The continuous increase in the production of metals and their subsequent release into the environment has lead to increased concentration of these elements in agricultural soils. Because microbes are involved in almost every chemical transformations taking place in the soil, considerable attention has been given to assessing their responses to metal contaminants. Short-term and long-term exposures to toxic metals have been shown to reduce microbial diversity, biomass and activities in the soil. Several studies show that microbial parameters like basal respiration, metabolic quotient, and enzymatic activities, including those of oxidoreductases and those involved in the cycle of C, N, P and other elements, exhibit sensitivity to soil metal concentrations. These have been therefore, regarded as good indices for assessing the impact of metal contaminants to the soil. Metal contamination has also been extensively shown to decrease species diversity and cause shifts in microbial community structure. Biochemical and molecular techniques that are currently being employed to detect these changes are continuously challenged by several limiting factors, although showing some degree of sensitivity and efficiency. Variations and inconsistencies in the responses of bioindicators to metal stress in the soil can also be explained by differences in bioavailability of the metal to the microorganisms. This, in turn, is influenced by soil characteristics such as CEC, pH, soil particles and other factors. Therefore, aside from selecting the appropriate techniques to better understand microbial responses to metals, it is also important to understand the prevalent environmental conditions that interplay to bring about observed changes in any given soil parameter.

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Section: Ureasementioning

confidence: 57%

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Tipayno¹,

Chauhan²,

Woo³

et al. 2011

Korean Journal of Soil Science and Fertilizer

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“…Typically the interaction of heavy metals with urease leads to decreased catalytic activity due to the binding of the metal ions with the enzyme thiol groups [14]. The results of the inhibition assays (Tables 1 -6) show that the metals examined in this study had different effects on urease activity.…”

Section: Inhibition Studies On Single -Metal Solutionsmentioning

confidence: 77%

“…The sensitivity of urease to heavy metal ions is due to the presence of multiple cysteine residue of which one, conserved principally to all known ureases, is located in the mobile flap of the enzyme active site [13]. Heavy metal ions inhibit the catalytic activity of urease by binding with a sulfhydryl group in the active center of the enzyme in a reaction analogous to the formation metal sulphides [14]. Once the metal atom is bound, the sulfhydryl group cannot function in catalysis hence there will be a marked decrease in the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Metal - Induced Inhibition of Soybean Urease as a Tool for Measuring Heavy Metals in Aqueous Samples

Magomya¹,

Barminas²,

Osemeahon³

2017

IOSR JAC

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“…Enzymes respond rapidly and directly to changes in nutrient and substrate availability by manipulating enzyme kinetics to best capitalize on environmental conditions [15], and enzyme activities have the potential to reflect changes in nutrient cycling [16]. The activities of hydrolases, such as b-glucosidase, urease, and phosphatase, are the keys controlling the availabilities of C, N, and P in soil, respectively [17]. b-glucosidase is a good indicator for soil quality because it controls the mineralization of organic matter.…”

Section: Introductionmentioning

confidence: 99%

Sedimentary Enzyme Kinetics of Land/Water Ecotones with Reed Domination

Wang

Yin²,

Wang

2010

CLEAN Soil Air Water

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Land/water ecotones, the transitional boundary zone between terrestrial and aquatic ecosystems, can effectively trap and assimilate nutrients from external sources. The changes of nutrient cycling will cause a response in enzyme activity. In this paper, the enzyme kinetics of land/water ecotones in a shallow eutrophic wetland in China, dominated by a reed (Phragmites australis) community, are studied. The results indicate that land/water ecotones exhibit a strong filtration function and nutrient factor is an important feature affecting the distribution of enzymes in the transect of the littoral zone. The obvious spatial differences of enzyme activities and nutrients are present in the transect of the reed beds. The land area is the hot zone, where significant changes in enzyme activity occur. T-test results show that the landward spot, 1 m away from the water-land interface, is quite different from other spots, and the 1 m spot is the hot spot where great biochemical change happens. The principal component analysis of the environmental variables shows that nutrient factors have an important affect on enzyme distribution in the transect of the littoral zone. The nutrient factor explains about 54% of the observed variance. In particular, TOC (total organic carbon) correlates with the other five factors (TN; total nitrogen, TP; total phosphorus, phosphatase, b-glucosidase, and urease) with correlative coefficients of 0.932, 0.595, 0.488, 0.433, and -0.468, respectively. The results indicate that TOC is a very important factor in Baiyangdian wetlands.

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Arsenic fractions and enzyme activities in arsenic-contaminated soils by groundwater irrigation in West Bengal

Cited by 94 publications

References 27 publications

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Effects of Metal and Metalloid Contamination on Microbial Diversity and Activity in Agricultural Soils

Assessment of Metal - Induced Inhibition of Soybean Urease as a Tool for Measuring Heavy Metals in Aqueous Samples

Sedimentary Enzyme Kinetics of Land/Water Ecotones with Reed Domination

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