Effect of Various Factors on the Sorption of Endosulphan on Two Indian Soils

Rawat, J. P.; Iraqi, S.M. Umar; Singh, R. P.

doi:10.1177/026361749701500902

Cited by 3 publications

(5 citation statements)

References 19 publications

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“…Sorption isotherms of α‐endosulfan by kaolinite in the presence of HA are compared with those in the absence of HA in Figure 2a. The K f values obtained from this experiment (Table 3) agree well with previous studies, which reported that the sorptive K f values of α‐endosulfan ranged from 6.74 to 140.7 ml/g in soils with low organic matter content [22,23,24,26]. The values of K f for α‐endosulfan by kaolinite in the presence of HA were approximately 1.3 times greater than those for the kaolinite‐only system, suggesting additional sorption of α‐endosulfan onto HA covering the surface of solids.…”

Section: Resultssupporting

confidence: 88%

“…Sorption isotherms of ␣-endosulfan by kaolinite in the presence of HA are compared with those in the absence of HA in Figure 2a. The K f values obtained from this experiment ( Table 3) agree well with previous studies, which reported that the sorptive K f values of ␣-endosulfan ranged from 6.74 to 140.7 ml/g in soils with low organic matter content [22,23,24,26].…”

Section: Sorption Of ␣-Endosulfan By Minerals With Ha Presentsupporting

confidence: 90%

“…Singh and Singh [21] reported that sorptive equilibrium for endosulfan was reached within 4 h in two different Indian soils (sandy loam [0.35% organic matter] and loam [0.59% organic matter]). Rawat et al [22] found that sorptive equilibrium for endosulfan was reached in Indian sandy loam soil and organic soil by 4 and 6 h, respectively. Parkpian et al [23] also observed that sorptive equilibrium in two Thailand tropical soils (clay and clay loam with 3.0% organic matter) for endosulfan was reached within 2 h. In addition, Sudhakar and Dikshit [31] indicated that sorptive equilibrium for endosulfan was reached in 5 h with wood charcoal used as a sorbent.…”

Section: Resultsmentioning

confidence: 99%

“…The environmental concern regarding its widespread distribution, particularly in aquatic environments, is its acute toxicity to aquatic organisms and moderate toxicity to invertebrates ( [20]; http:/ /www.apvma.gov.au/chemrev/prsendo.shtml). The overall sorptive behavior of endosulfan in soil has been investigated extensively [21][22][23][24][25][26][27]; however, its sorptive behavior by clay minerals has been reported less often.…”

Section: Introductionmentioning

confidence: 99%

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Sorption of humic acids and α‐endosulfan by clay minerals

Hengpraprom

Lee

Coates

2006

Enviro Toxic and Chemistry

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Sorption of alpha-endosulfan by kaolinite and montmorillonite alone and in the presence of sorbed and dissolved humic acid (HA) was investigated (pH 8 and 25 degrees C). Three types of HA, Elliot soil HA (EHA), Peat HA (PHA), and Summit Hill HA (SHHA), were used to represent typical humic substances found in soils. For sorption of HA by either mineral, Freundlich sorption coefficient (K(f)) values appeared to decrease in the order of EHA > PHA > SHHA, which followed increasing polarity (expressed as the O/C atomic ratio) and decreasing percent-carbon content. For both clays, sorption of alpha-endosulfan by the HA mineral complex was greater than for sorption by the clay alone. Sorption of alpha-endosulfan by the HA mineral complexes followed the same order as the K(f) of the HAs (EHA > PHA > SHHA). Based on the amount of HA adsorbed by each mineral, organic carbon partition coefficients (K(oc)) were determined for sorption of alpha-endosulfan by two of the HA mineral complexes. The value of K(oc) for alpha-endosulfan sorption was greater for kaolinite EHA than kaolinite SHHA. However, the opposite trend was found with the montmorillonite HA complexes. Montmorillonite appeared to sorb alpha-endosulfan and/or HA with higher affinity than kaolinite, which likely is due to its 2:1 layer structure and higher surface area. Sorption of endosulfan diol, a hydrolysis product, by the minerals was much less than the parent pesticide.

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Section: Resultssupporting

confidence: 88%

Section: Sorption Of ␣-Endosulfan By Minerals With Ha Presentsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sorption of humic acids and α‐endosulfan by clay minerals

Hengpraprom

Lee

Coates

2006

Enviro Toxic and Chemistry

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“…Most of the data on pesticide adsorption by soils deals with aqueous solutions [3][4][5][6]. However, a number of investigations have been carried out on the adsorption of pesticides on soils from non-aqueous solvents and solvent mixtures [6][7][8][9][10] and it was reported that the adsorption capacity for pesticides decreased with the increase of the volume fraction of the organic solvent [11]. On the other hand, the adsorption of pesticides from water may be suppressed by the hydrophilic nature of soil which increased the adsorption of water rather than of the pesticide [12].…”

Section: Introductionmentioning

confidence: 99%

Removal of Pesticide (Endosulphan) from Water via Adsorption onto Activated Carbons Developed from Date Pits

Ashour¹

2007

Carbon letters

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Activated carbons were prepared by impregnation of crushed clean date pits in concentrated solutions of phosphoric acid or zinc chloride followed by carbonization in absence of air at 600ºC. Steam-activated carbon was prepared by gasifying 600ºCcarbonization product at 950ºC to a burn-off = 50%. KOH-activated carbon was prepared by impregnating date pitscarbonization product obtained at 450ºC in concentrated KOH solution followed by carbonization at 840ºC. Textural properties of these carbons were determined from nitrogen adsorption at −196ºC and the chemistry of the carbon surface was investigated by determination and of the surface carbon-oxygen (C-O) groups using bases of variable strength and dilute HCl. The adsorption of endosulphan at 27ºC on all the carbons prepared was undertaken. Adsorption of this pesticide at 32 and 37ºC was also undertaken for steam-activated and KOH-activated carbons. Phosphoric acid-activated carbons and steamactivated carbons are mainly microporous and have high surface concentration of C-O groups of acidic nature. Steamactivated and KOH-activated carbons exhibited surface areas > 1000 m 2 /g and contain micro and non-micrpores. The adsorption of endosulphan was related to the surface area of non-micropores and was retarded by the high concentration of surface C-O groups. The thermodynamic properties indicated the feasibility of the adsorption process and the possible regeneration of the carbon for further use.

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Adsorption and Movement of Endosulfan in Soils: A Verification of the Co-Solvent Theory and a Comparison of Batch Equilibrium and Soil Thin Layer Chromatography Results

Singh

2008

Adsorption Science & Technology

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Batch equilibrium and soil thin-layer chromatography (soil TLC) techniques were used to investigate the influence of different volume fractions (f s = 0.25, 0.50, 0.75 and 1.0) of organic co-solvents (acetone and methanol) on the adsorption and movement of endosulfan in three different types of Indian soils (silt loam, loam and sandy loam). The measured equilibrium adsorption isotherms for all three soils studied were L-shaped for both co-solvent/water mixtures at all f s values. All isotherms were in close agreement with the Freundlich equation. Higher adsorption of endosulfan was observed on silt loam soil followed by loam and sandy loam soils at all f s values for both co-solvent systems, as was anticipated from the values of the Freundlich constants, K, and the partition coefficients, K D. The order of the K and K D values also confirmed that endosulfan adsorption was higher in methanol/water mixtures than in acetone/water mixtures and decreased with increasing f s values. The R f values obtained from soil TLC studies were inversely proportional to the K and K D values for both co-solvent systems. The higher K and K D values and lower R f values in methanol/water mixtures relative to acetone/water mixtures for all the three soils studied indicated that acetone had a greater potential for ground water contamination through leaching from potential sites than methanol. The affinity of endosulfan towards the organic carbon and clay content of the soils was evaluated by calculating the K OC and K C values. The data obtained indicated that, although the affinity of endosulfan was better correlated with the organic carbon content, the contribution of the clay content of soils towards endosulfan adsorption cannot be ignored. The adsorption data were used to evaluate the co-solvent theory for describing the adsorption of endosulfan in acetone/water and methanol/water mixtures. The aqueous-phase partition coefficients, K DW (mol/g), normalized with respect to f oc for endosulfan were evaluated via the extrapolation f s → 0.

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Effect of Various Factors on the Sorption of Endosulphan on Two Indian Soils

Cited by 3 publications

References 19 publications

Sorption of humic acids and α‐endosulfan by clay minerals

Sorption of humic acids and α‐endosulfan by clay minerals

Removal of Pesticide (Endosulphan) from Water via Adsorption onto Activated Carbons Developed from Date Pits

Adsorption and Movement of Endosulfan in Soils: A Verification of the Co-Solvent Theory and a Comparison of Batch Equilibrium and Soil Thin Layer Chromatography Results

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