Adsorption, Desorption and Mobility of Four Commonly Used Pesticides in Malaysian Agricultural Soils

Cheah, Uan‐Boh; Kirkwood, R. C.; Lum, Keng‐Yeang

doi:10.1002/(sici)1096-9063(199705)50:1<53::aid-ps558>3.3.co;2-g

Cited by 19 publications

(30 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Samples were placed on a reciprocal shaker at 20ºC, for four hours, to get the adsorption thermodynamic equilibrium (Sprankle et al, 1975a;Hance, 1976;Nomura & Hilton, 1977;Cheah et al, 1997). Samples were subsequently centrifuged for 20 min at 20,000 rpm at 1ºC (Ultracentrifuge Sorvall OTD-Combi) and the liquid phases were then passed through filter paper (MFS 5c, Whatman 42 equivalent).…”

Section: Methodsmentioning

confidence: 99%

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Kogan

Metz

Ortega

2003

Pesq. agropec. bras.

View full text Add to dashboard Cite

The objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 µg g -1 for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model was 231,884, 17,874 and 5,670 µg g -1 for Valdivia, Clarillo, and Chicureo soils, respectively. Glyphosate adsorption on the Valdivia soil showed a linear behavior at the range of concentrations used and none of the adjusted models became asymptotic. The high glyphosate adsorption capacity of the Valdivia soil was probably a result of its high exchangeable Al, extractable Fe, and alophan and imogolite clay type. Adsorption was very much related to phosphate dynamics in the Valdivia soil, which showed the larger unoccupied phosphate binding sites. However relationship between unoccupied phosphate binding sites and glyphosate adsorption in the other two soils (Clarillo and Chicureo) was not clear.

show abstract

Section: Methodsmentioning

confidence: 99%

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Kogan

Metz

Ortega

2003

Pesq. agropec. bras.

View full text Add to dashboard Cite

show abstract

“…Glyphosate is easily adsorbed onto soil colloids and can reach values of 1.188 L kg -1 in organic soils (Cheah et al, 1999), being adsorbed into soils even after destruction of the organic matter . Adsorption of glyphosate is mainly related to the mineral fraction of the soil, especially on Fe and Al oxides and clays, but organic matter also plays a fundamental role in the process (Toni et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of pig slurry application on soil physical and chemical properties and glyphosate mobility

Oliveira

Pinheiro

Veiga³

2014

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYPig slurry applied to soil at different rates may affect soil properties and the mobility of chemical compounds within the soil. The purpose of this study was to evaluate the effects of rates of pig slurry application in agricultural areas on soil physical and chemical properties and on the mobility of glyphosate through the soil profile. The study was carried out in the 12 th year of an experiment with pig slurry applied at rates of 0 (control), 50, 100 and 200 m 3 ha -1 yr -1 on a Latossolo Vermelho distrófico (Hapludox) soil. In the control, the quantities of P and K removed by harvested grains were replaced in the next crop cycle. Soil physical properties (bulk density, porosity, texture, and saturated hydraulic conductivity) and chemical properties (organic matter, pH, extractable P, and exchangeable K) were measured. Soil solution samples were collected at depths of 20, 40 and 80 cm using suction lysimeters, and glyphosate concentrations were measured over a 60-day period after slurry application. Soil physical and chemical properties were little affected by the pig slurry applications, but soil pH was reduced and P levels increased in the surface layers. In turn, K levels were increased in sub-surface layers. Glyphosate concentrations tended to decrease over time but were not affected by pig slurry application. The concentrations of glyphosate found in different depths show that the pratice of this application in agricultural soils has the potential for contamination of groundwater, especially when the water table is the surface and heavy rains occur immediately after application.Index terms: soil fertilization, physical and chemical properties, pollutant transport, pesticide.(1) Received for publication on April 24, 2013 and approved on June 9, 2014. RESUMO: EFEITOS DE DOSES DE DEJETOS LÍQUIDOS DE SUÍNOS SOBRE OS ATRIBUTOS FÍSICOS E QUÍMICOS DO SOLO E SOBRE A MOBILIDADE DO GLIFOSATOOs dejetos líquidos de suínos são aplicados no solo, como fertilizantes, em diferentes doses. Isso pode interferir nos atributos do solo e na mobilidade de espécies químicas. Este trabalho teve por objetivo avaliar a influência das doses de dejeto líquido de suínos aplicadas em áreas agrícolas sobre os atributos químicos e físicos do solo e sobre a mobilidade de glifosato no perfil do solo. O trabalho foi realizado no 12º ano de condução de um experimento, com aplicação de dejeto líquido de suínos em Latossolo Vermelho distrófico, com doses anuais de 0, 50, 100 e 200 m 3 ha -1 ano -1 . Na testemunha (dose 0), houve reposição das quantidades de P e K exportados pelos grãos das culturas. Em cada parcela, foi realizada a determinação dos atributos físicos (densidade, porosidade, textura, condutividade hidráulica do solo saturado) e químicos (teor de matéria orgânica, pH, P extraível e K trocável) do solo. Amostras de solução do solo foram coletadas em seu perfil com o uso de lisímetros de sucção, sendo determinadas as concentrações de glifosato durante 60 dias. Os atributos físicos e químicos do solo foram pouco influenci...

show abstract

“…Moléculas altamente sorvidas aos colóides do solo, como os herbicidas glifosato, paraquat e diquat, tendem a ser pouco lixiviadas (Cheah et al, 1997), dependendo principalmente da estrutura e textura do solo e do índice pluviométrico.…”

Section: Movimentação No Perfil Do Solo -Lixiviaçãounclassified

“…Esquema da especiação química do glifosato em função do pH. pK b < 2; pK a1 = 2,27; pK a2 = 5,57 e pK a3 = 10,86 (Franz, 1986 (Sprankle et al, 1975;Hance et al, 1976;Nomura & Hilton, 1977;Cheah et al, 1997;Jonge et al, 2001). Na grande maioria dos casos, a baixa recuperação estava relacionada à capacidade dos solos em adsorver fosfatos.…”

Adsorption, Desorption and Mobility of Four Commonly Used Pesticides in Malaysian Agricultural Soils

Cited by 19 publications

References 11 publications

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Effects of pig slurry application on soil physical and chemical properties and glyphosate mobility

Comportamento do glifosato no solo e deslocamento miscível de atrazina

Contact Info

Product

Resources

About