Nonionic Surfactant Effects on Adsorption and Degradation of 2,4‐D

Amonette, J. E.; O’Connor, G. A.

doi:10.2136/sssaj1980.03615995004400030021x

Cited by 19 publications

(10 citation statements)

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“…At low concentrations, nonionic surfactant increases the adsorption of atrazine, while cationic and anionic surfactants decrease the pesticide adsorption. Contrary to most other evidence ( Amonette and O'Connor, 1980 ; Bayer, 1967 ), low concentrations of surfactant were found to mobilize atrazine in sediments. This finding suggests that we need to notice that, even at low concentrations, surfactants are able to mobilize potentially toxic substances that have been adsorbed by sediments.…”

Section: Discussioncontrasting

confidence: 99%

Effect of Surfactants at Low Concentrations on the Sorption of Atrazine by Natural Sediment

Tao¹,

Wang²,

Tang³

2006

Water Environment Research

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A series of experiments were carried out to determine the effect of surfactants at low concentrations on the sorption of atrazine by natural sediments. With surfactant concentrations ranging from 0 to 20 mg/ L, anionic and cationic surfactants appreciably reduce the adsorption of atrazine, while nonionic surfactant decreases the adsorption of atrazine at concentrations equal to or less than 1 mg/L and increases adsorption at higher concentrations. Desorption of atrazine in the presence of different sodium dodecylbenzene sulfonate (SDBS) concentrations shows that a portion of the bound pesticide resists desorption in the SDBS free system. However, the addition of SDBS accelerates the desorption of atrazine. Furthermore, the nature of sediment and the contacting sequence of SDBS, at 10 mg/L, with the sediment, also influence the adsorption of atrazine. The conclusions in this study could be explained partially by the effect of the type and concentration of surfactants and the characteristics of sediments. Water Environ. Res., 78, 653 (2006).

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Section: Discussioncontrasting

confidence: 99%

Effect of Surfactants at Low Concentrations on the Sorption of Atrazine by Natural Sediment

Tao¹,

Wang²,

Tang³

2006

Water Environment Research

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“…1-11) and (3) Soils of variable charge with Fef>5% (soils No. [12][13][14][15][16][17][18][19][20][21][22]. The soils were thus considered according to their clay mineralogy ( …”

Section: Resultsmentioning

confidence: 99%

Soil adsorption of 2,4‐D as affected by the clay mineralogy

Hermosı́n

Cornejo

1991

Toxicological & Environmental Chemistry

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The adsorption of 2,4-D has been studied obtaining adsorption isotherms on 22 soils by the batch equilibration technique. Fitting the adsorption data to the Freundlich equation three adsorption capacity were calculated at low (Kf or Cs 1), medium (Cs4.5) and high (Cs 30) 2,4-D concentration. The adsorption capacity and intensity factors obtained in this study resulted in according with those reported by other authors. From the simple regression analysis between adsorption capacities and soil properties it was shown that organic matter and free iron contents of soils favoured the adsorption, whereas pH, surface area and clay content decreased the adsorption of 2,4-D. By dividing the soils according to their clay mineralogy it was shown that the soils properties determining the adsorption capacity were different for soils with phyllosilicates as essential clay components than for soils with iron oxides as major clay components.

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“…Flow-through systems were used by most workers cited in Table 5 (Wolf and Martin 1976;Wilson and Cheng 1978;Amonette and O'Connor 1980;McCall et al 1981). The advantages of flow-through systems are that they permit the running of soil experiments under precisely defined conditions, the use of different gaseous environments and operation using either positive or negative pressure (Guth 1980).…”

Section: Methodsmentioning

confidence: 99%