Time effect on the fractionation of heavy metals in soils

Lu, Anxiang; Zhang, Shuzhen; Shan, Xiao-quan

doi:10.1016/j.geoderma.2004.08.002

Cited by 219 publications

(136 citation statements)

References 23 publications

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“…The differences between sorbed Pb and sorbed Cd for a given soil were significant ( p < 0.01; except for those in the Ultisol of Treatments 1 and 2, and those in the Mollisol of Treatment 2). These differences in soil affinity for Pb and Cd have been observed by others for tropical soils and/or pure oxidic mineral systems (Kinneburgh et al, 1976;Puls et al, 1991) as well as for soils low in Fe/Al oxides (Lu et al, 2005;Pardo, 2000). This is usually attributed to differ ences in metal characteristics and resultant affinity for sorption sites McBride, 1994).…”

Section: Pb and CD Affinity For Soil Surfacesmentioning

confidence: 58%

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Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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The sorption and desorption of Pb and Cd in tropical soils is strongly influenced by the order in which these metals enter the soil environment. AbstractIt is important to examine mechanisms of Pb and Cd sorption in soils to understand their bioavailability. The ability of three tropical soils to retain Pb, Cd, and Ca was evaluated. The objectives of this study were to (1) determine the extent to which soil sorption sites are metal specific, (2) investigate the nature of reactions between metals and soil surfaces, and (3) identify how metals compete for sorption sites when they are introduced to soils sequentially or concurrently. Lead was shown to be much less exchangeable than Cd and inhibited Cd sorption. Cadmium had little effect on Pb sorption, though both Ca and Cd inhibited the adsorption of Pb at exchange sites. Lead appears to more readily undergo innersphere surface complexation with soil surface functional groups than either Cd or Ca. Thus, regardless of when Pb is introduced to a soil, it should be less labile than Cd.

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Section: Pb and CD Affinity For Soil Surfacesmentioning

confidence: 58%

“…In several studies, more Cd was found in the exchangeable fraction compared to Pb for soils where heavy metals were added directly (Kaasalainen and Yli-Halla, 2003;Lu et al, 2005), or applied via fly ash (Lim et al, 1997) or biosolids amendments (Sloan et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Sequential sorption of lead and cadmium in three tropical soils

Appel

Lena

Rhue

et al. 2008

Environmental Pollution

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“…The trend is LF (60 min) <GSF (720 min)≤JB (720 min)<MA (1440 min). Since the rate of metal sorption in soils may be related to its bioavailability (Lu et al 2005), it means that these metals will be more available in the MA soil. It was also observed that the sorption trend for the metals were the same in all soils: Pb(II)>Cu(II)> Cd(II).…”

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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“…As for the two soils, the desorption amount of metals from Jiangxi soil decreased less than that from Heilongjiang soil (Table 4). Recently, Lu et al (2004) studied the residence time effect (3 h to 8 weeks) on fractionation and transformation of heavy metals in soils. Metals in soils were fractionated into water soluble, carbonate, Fe-Mn oxide, organic matter and sulfide bound fractions by a sequential extraction method (Tessier et al, 1979).…”

Section: Effect Of Residence Time On Extractability Of Cu CD and Pbmentioning

confidence: 99%