Sulphate Adsorption in Soils of North and Northeast Iran

Shahsavani, S.; Ardalan, M.; Sistani, K. R.

doi:10.1080/00103620600710173

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…Sulphate adsorption has been attributed to a pH dependent positive charge typical of acidic soils (Scherer, 2009). In neutral to alkaline soils, there was no appreciable adsorption of sulphur noticed (Shahsavani et al, 2006;Cui et al, 2006). The regression analysis between the values of S extracted by Ca chloride (CaCl 2 -S) and Ca phosphate (Ca phos-phate-S) reagents for all the 86 soil samples studied showed that they were highly significantly correlated (R 2 = 0.82, n = 86) (table.…”

Section: Resultsmentioning

confidence: 99%

Extractability and availability index of sulphur in selected soils of Odisha

Padhan

Sen

Rout

2016

JANS

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We aimed to evaluate the extractability of two reagents viz.0.15% CaCl2 & 0.01M Ca (H2PO4) for sulphur along with the sulphur availability index of mixed red and black soils. For this 86 soil samples were collected from mixed red and black soil regions and extracted with these solutions. Results showed that both these solutions ex-tracted nearly similar amount of sulphur in black soils while the Ca phosphate solution extracted higher amount (13.9mgkg-1) compared to Ca chloride solution (11.5mgkg-1) in red soil regions. Considering all the 86 soil samples tested, there was an excellent correlation between the extractable sulphur, the highest correlation being reported from black soils (R2= 0.97). Sulphur availability index was found to be higher in black soils (mean 6.6) compared to red soils (mean 5.1). Also the content of adsorbed sulphur was found to be high in red soils (2.4mgkg-1) compared to black soils (1.5mgkg-1). Correlation matrix and regression equations (Ca phosphate S= 5.00+ 0.77 Ca chloride S) were worked out between the extractable sulphur and soil properties to justify the results.

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Section: Resultsmentioning

confidence: 99%

Extractability and availability index of sulphur in selected soils of Odisha

Padhan

Sen

Rout

2016

JANS

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“…However, when soil pH is in acidic range, soil particles carry some positive charges and, thus, adsorb sulfate. The capability of phosphate to displace sulfate adsorbed on soil-particle surface is stronger than that of chloride; and thus, Ca phosphate extracts significantly greater amounts of S from soils with pH in the acidic range (Ensminger, 1954;Curtin and Syers, 1990;Shahsavani et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…On the suitability of various extractants, it has been stated that Ca phosphate seems to be one of the best extractants, because phosphate ions displace the adsorbed sulfate, especially in acidic-pH soils and Ca 2+ ions flocculate the soil colloids (Fox et al, 1964;Harward and Reisenauer, 1966;Maynard et al, 1987;Schmalz et al, 2001). Among the several factors that influence sulfate sorption-desorption and its extractability by various reagents used for sulfate extraction, soil pH plays a dominant role, and generally the sorption of sulfate is low in soils with pH > 6 (Ensminger, 1954;Curtin and Syers, 1990;Shahsavani et al, 2006;Cui et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of Ca chloride and Ca phosphate for extractable sulfur in soils with a wide range in pH

Sahrawat

Murthy

Wani

2009

Z. Pflanzenernähr. Bodenk.

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Deficiency of sulfur (S) is becoming widespread in the rainfed systems of India, and there is increasing need for diagnosing the deficiency. Calcium chloride and Ca phosphate are commonly used for extracting available S in soils. Because of cost and the ease of availability locally, we prefer using Ca chloride as an extractant over Ca phosphate, for extracting available S. However, there is paucity of data on the comparative evaluation of the two extractants to extract available S, especially in soils having a wide range in natural pH (from acidic to alkaline range). It is recognized that soil pH plays a dominant role in the adsorption–desorption and extractability of sulfate‐S in soils. We compared the extraction of S by Ca chloride and Ca phosphate in 86 Indian soils having a wide range in pH (4.5 to 10.6). Sulfur in the extracts was determined by ICP‐AES. Considering all the 86 soil samples tested, there was an excellent agreement between the values of extractable S determined by using the two extractants (r = 0.96, p < 0.001). However, the correlation coefficient (r) between the values of extractable S by the two reagents, although highly significant, varied among the groups of soil samples according to the range in soil pH. The highest correlation coefficient (r = 0.99, p < 0.0001, n = 17) was found for soils with pH in the alkaline range (8.5–10.6), and the lowest correlation coefficient (r = 0.71, p < 0.0001, n = 58) was obtained with a set of soil samples with pH in the acidic range (4.5–6.5). For soil samples having pH in the near‐neutral range (6.7–7.3), an excellent agreement was observed (r = 0.93, p < 0.0001, n =11) between the extractable‐S values obtained by the two extractants. While Ca phosphate extracted higher amount of S compared to Ca chloride in soil samples with pH in the acidic range, the two extractants were equally effective for soil samples with pH in the neutral or alkaline range. Our results suggest that for most of the soils in the semiarid tropical regions, which have pH in the neutral to alkaline range, Ca chloride can replace Ca phosphate as an extractant for removing available S in such soils.

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“…Nos últimos anos, vários adsorventes têm sido desenvolvidos para a remoção de íons sulfato, tais como: óxidos metálicos [10][11][12][13][14], quitosana [3][4][5][6][7][8][9][10][11][12][13][14][15], óxidos metálicos hidratados [2,16], zeólita [17], goethite [18][19][20][21][22][23] e alguns tipos de solo [24][25]. Dentre estes materiais, os óxidos metálicos são materiais promissores para a remoção desse íon por possuírem elevada afinidade pelos mesmos [19].…”

Section: Introductionunclassified

Adsorção de íons sulfato em ZrO2.nH2O preparado pelo método da precipitação convencional e da precipitação em solução homogênea

2009

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ResumoEste trabalho visa a preparação, caracterização e estudo da adsorção de íons sulfato em óxido de zircônio hidratado preparado pelos métodos da precipitação convencional e da precipitação em solução homogênea. Os materiais obtidos foram caracterizados por difração de raios X, análise termogravimétrica, microscopia eletrônica de varredura e análise de área superficial específica pelo método BET. Através da constante Q 0 , relacionada com a capacidade de adsorção máxima, observou-se que o ZrO 2 .nH 2 O/PSH possui maior capacidade de adsorção para íons sulfato que o ZrO 2 .nH 2 O/PC. Pelos resultados de ∆G, observou-se que os íons sulfato foram adsorvidos através de reações energeticamente favoráveis para toda a faixa de concentração estudada. Palavras-chave: óxido de zircônio hidratado, adsorção, isoterma de Langmuir. Abstract This work reports the preparation, characterization and adsorption study of sulfate on hydrous zirconium oxides prepared by conventional and homogeneous solution precipitation methods. The materials prepared were characterized by X-ray diffraction

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Sulphate Adsorption in Soils of North and Northeast Iran

Cited by 4 publications

References 15 publications

Extractability and availability index of sulphur in selected soils of Odisha

Extractability and availability index of sulphur in selected soils of Odisha

Comparative evaluation of Ca chloride and Ca phosphate for extractable sulfur in soils with a wide range in pH

Adsorção de íons sulfato em ZrO2.nH2O preparado pelo método da precipitação convencional e da precipitação em solução homogênea

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