Sorption and desorption of fluorene on five tropical soils from different climes

Olu-Owolabi, Bamidele I.; Diagboya, Paul N.; Adebowale, Kayode O.

doi:10.1016/j.geoderma.2014.10.012

Cited by 45 publications

(24 citation statements)

References 29 publications

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“…This indicated that the availability of the adsorption sites for the thiram molecules reduced as the pH value increased. This finding is in accordance with the general trend observed for many various other pesticides (Liu et al, 2010;Cadkova et al, 2012;Olu-Owolabi et al, 2015). As expected, thiram is a weak acidic fungicide thus its speciation is pH dependent.…”

Section: Effect Of Ph On Adsorptionsupporting

confidence: 92%

Adsorption-desorption behavior of thiram: effect of soil type, temperature and pH

Maznah

Muhamad

Sahid

2016

Chilean J. Agric. Res.

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The present study was conducted in order to investigate the adsorption and desorption behavior of tetramethylthiuram disulfide (thiram) using the batch equilibration technique in two soil namely: Ultisols and Inceptisols. The adsorptiondesorption isotherms were expressed by the Freundlich equation. The adsorption isotherms of thiram was classified as L-type under Gile's classification. The Freundlich's adsorption coefficient (Kd) value for thiram in the Ultisols and Inceptisols soil were 3.78 and 2.10 mL g -1 , respectively. Results indicated that soil organic matter was the main factor affecting thiram behavior in the studied soils. The calculated total percentage desorption values from the Ultisols and Inceptisols soil after the fourth desorption process were 39.2% and 51.6%, respectively. The negative Gibb's free energy change (∆G°) values obtained suggest that thiram adsorption is an exothermic process. The effects of temperature (25, 30, and 35 °C) and soil pH (3, 7, 10) were also studied on adsorption of thiram in the test soils. Results showed that adsorption of thiram was not affected by temperature but clearly affected by soil pH.Key words: Thiram, adsorption, desorption, soil, temperature, pH. ABSTRACTAdsorption-desorption behavior of thiram: effect of soil type, temperature and pH

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Section: Effect Of Ph On Adsorptionsupporting

confidence: 92%

Adsorption-desorption behavior of thiram: effect of soil type, temperature and pH

Maznah

Muhamad

Sahid

2016

Chilean J. Agric. Res.

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“…Comparisons of the correlation coefficients (r 2 ) and the estimated sorption capacities (q e ) of the PFO and PSO showed that the data were better described by the PSO; the r 2 values of the PSO were close to unity and the q e values were better correlated to the experimentally obtained results. This implied that these sorptions involved sharing or exchange of valence electrons (Diagboya et al 2014a;Olu-Owolabi et al 2015).…”

Section: Cation Sorption Studymentioning

confidence: 99%

Effects of time, soil organic matter, and iron oxides on the relative retention and redistribution of lead, cadmium, and copper on soils

Diagboya

Olu-Owolabi

Adebowale

2015

Environ Sci Pollut Res

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In order to predict the bioavailability of toxic metals in soils undergoing degradation of organic matter (OM) and iron oxides (IOs), it is vital to understand the roles of these soil components in relation to metal retention and redistribution with time. In this present work, batch competitive sorptions of Pb(II), Cu(II), and Cd(II) were investigated between 1 and 90 days. Results showed that competition affected Cd(II) sorption more than Cu(II) and Pb(II). The sorption followed the trend Pb(II) >>Cu(II)>Cd(II), irrespective of aging, and this high preference for Pb(II) ions in soils reduced with time. Removal of OM led to reduction in distribution coefficient (K d ) values of ≈33 % for all cations within the first day. However, K d increased nearly 100 % after 7 days and over 1000 % after 90-day period. The enhanced K d values indicated that sorptions occurred on the long run on surfaces which were masked by OM. Removal of IO caused selective increases in the K d values, but this was dependent on the dominant soil constituent(s) in the absence of IO. The K d values of the IOdegraded samples nearly remained constant irrespective of aging indicating that sorptions on soil components other than the IO are nearly instantaneous while iron oxides played greater role than other constituents with time. Hence, in the soils studied, organic matter content determines the immediate relative metal retention while iron oxides determine the redistribution of metals with time.

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“…More recent studies, such as Boivin et al (2005) and Olu‐Owolabi et al (2014), also reported hysteresis in the desorption of organic sorbates. Olu‐Owolabi et al (2015) reported specifically adsorption–desorption hysteresis for fluorene in tropical soils, with the extent of hysteresis increasing with the soil's OM content.…”

Section: Selected Properties Of Fluorenementioning

confidence: 99%

The Effect of the Moisture Regime on the Interaction of Fluorene with Porous Media

Giat

Mingelgrin

2015

J. Environ. Qual.

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Movement and persistence of organic molecules in porous media is strongly influenced by their interactions with the solid phase. Understanding these interactions is important for the execution of reliable risk assessments and for proper handling and disposal of toxic organic chemicals. Transport and attenuation models often assume rapid adsorption-desorption equilibration and neglect the role of the ever-changing moisture regime at the top of the vadose zone. Adsorption of the polyaromatic hydrocarbon fluorene (CH), both from hexane and from water, on a cattle manure compost and on two soils-Dor (montmorillonitic, 1.9% organic matter [OM]) and Maagan-Michael (kaolinitic, 5.2% OM)-was studied. Adsorption from hexane mimics interactions with surfaces exposed to a gas phase or to an apolar liquid. Desorption was measured after loading the sorbents with fluorene dissolved in hexane, evaporating the solvent, and incubation in the wet state (above saturation of the porous medium), air-dried, or while undergoing wetting-drying cycles. Although good correlation was observed between the adsorption coefficient of fluorene from water and OM content, adsorption from hexane highly correlated with the surface charge density of the sorbent (its cation exchange capacity or its polarity). When added to the sorbents from hexane and then desorbed into water, less fluorene desorbed than predicted by its aqueous adsorption isotherms. Desorption from all sorbents decreased as the duration of incubation at air dryness increased. Thus, fluorene exhibited adsorption-desorption hysteresis, and a particularly strong adsorption-desorption hysteresis was exhibited by fluorene-loaded Maagan-Michael soil after undergoing wetting-drying cycles.

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Sorption and desorption of fluorene on five tropical soils from different climes

Cited by 45 publications

References 29 publications

Adsorption-desorption behavior of thiram: effect of soil type, temperature and pH

Adsorption-desorption behavior of thiram: effect of soil type, temperature and pH

Effects of time, soil organic matter, and iron oxides on the relative retention and redistribution of lead, cadmium, and copper on soils

The Effect of the Moisture Regime on the Interaction of Fluorene with Porous Media

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