Cadmium Sorption to Soil Separates Containing Layer Silicates and Iron and Aluminum Oxides

Zachara, John M.; Smith, S. C.; Resch, Charles T.; Cowan, Christina E.

doi:10.2136/sssaj1992.03615995005600040012x

Cited by 103 publications

(56 citation statements)

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“…The mollisol had the lowest clay content and surface area of the three soils but had the highest CEC as the clay fraction was dominated by 2 : 1 layer silicates (smectite and vermiculite, with a relatively large and permanent charge) whilst the other soils were dominated by kaolinite. The importance of clay minerals for Cd sorption in tropical soils was further shown by the study of Zachara et al (1992) which showed that Cd sorption in ultisols at pH46.5 was dominated by: (i) sorption of Cd on hydroxylated sites on edges of layer silicates (or on FeyAl oxides) andyor; (ii) exchange of CdOH þ on the fixed charge sites of layer silicates. At pH56.5 Cd sorption was dominated by the CEC of the isolated fractions: the CEC itself was related to the proportions of 1 : 1 and 2 : 1 layer silicates in the soils.…”

Section: Clay Mineralsmentioning

confidence: 95%

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The mobility and bioavailability of trace metals in tropical soils: a review

Rieuwerts

2007

Chemical Speciation & Bioavailability

134

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In recent years, initiatives on critical loads of metals have resulted in the development of models to predict critical, i.e. mobile or bioavailable, concentrations of potentially toxic elements in soils. These models have been based on data from temperate soils and, considering the fundamentally different soil chemistry of the major tropical soil types, it is unlikely that such models could be applied successfully in the tropics. In particular, the major tropical soil types, particularly oxisols and ultisols, are distinguished from most temperate soils by low activity clays, low organic matter contents, low pH values and high levels of Fe oxides. The aim of this review paper is to collate existing information on the behaviour of trace metals in tropical soils, particularly in relation to metal mobility and bioavailability, and note differences, where these exist, with temperate soils. The main findings are as follows. The acidic nature of many tropical soils may not, of itself, lead to greater metal solubility. The relatively low organic matter content of tropical soils suggests that it cannot be relied upon to retain metals. However, when it is present, it appears to be important in the retention of copper, lead and zinc. The clay fractions of many tropical soils are dominated by kaolinite which is less able than 2 : 1 layer silicate clays to adsorb metals. However, oxisols and ultisols in particular have relatively high Fe oxides contents and these may be effective in metal sorption. Overall though, soils such as oxisols and ultisols appear to sorb relatively low amounts of added metals, most likely explained by the low activity clay minerals they contain and the rapid decomposition of organic matter incorporated into them. Dominant retention mechanisms, where they occur, are inner and outer sphere adsorption but not precipitation. Cadmium, Cu, Zn and Ni appear to be mobile in tropical soils. Chromium may be mobile in the A horizon but retained in the B horizon. The evidence for Pb points to surface retention, as is often observed for this metal in temperate soils. Metals in contaminated tropical soils appear to be rather bioavailable, judging by the few studies on plant uptake. It should be noted that the above statements are based on a relatively small number of studies. Further work is required if we are to gain an improved understanding of the mobility and bioavailability of trace metals in tropical soils.

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Section: Clay Mineralsmentioning

confidence: 95%

“…de Matos et al (2001) found no correlation between Fe oxide content and retention of Cd, Cu, Pb and Zn in Brazilian oxisols and ultisols. Similarly, Zachara et al (1992), in a study of Cd sorption by ultisols, concluded that crystalline Fe oxides were not significant sorbents of Cd.…”

Section: Fe and Al Oxidesmentioning

confidence: 99%

The mobility and bioavailability of trace metals in tropical soils: a review

Rieuwerts

2007

Chemical Speciation & Bioavailability

134

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“…Characteristic soil horizons are in italics a Yellow River-suspended particle matters, data from Huang and Zhang (1990) 50-200 m 2 g −1 , respectively) are considered to be important adsorptive sites to bind heavy metals (Kahle et al 2002;Zachara et al 1992). Moreover, the higher amount of primary minerals, like quartz and feldspar in surface horizon than characteristic horizon, represented a more coarse-textured soil, which could facilitate the leaching of heavy metals downward resulting in the deposition of heavy metals in the characteristic horizon ).…”

Section: Depth Distribution Of Heavy Metals In Typical Soil Profilesmentioning

confidence: 99%

Distribution of heavy metals in soils of the Yellow River Delta: concentrations in different soil horizons and source identification

Zhang

Chen

et al. 2014

J Soils Sediments

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Purpose The Yellow River Delta, an active land-ocean interaction area, will develop into a large eco-economic region in East China during the coming decade. It is necessary to assess the geochemical features of heavy metals in the soils. The objectives of this research were to evaluate the concentrations and distribution of heavy metals (Cr, Ni, Cu, Zn, Pb, and Cd) in soil profiles of the area and to identify their sources. Materials and methods Horizon samples were collected based on pedogenic features from bottom to top in each profile to a depth of 120 cm and a total of 92 samples were collected. The sampling sites were grouped into four lines from inland to coastal area with three land use types (cotton field, cereal field, and wetland). The concentrations of Cr, Ni, Cu, Zn, Pb, and Cd were measured by inductively coupled plasma-mass spectrometry. Iron oxide fractions in the soil were extracted by oxalate-oxalic acid and dithionite-citrate-bicarbonate. X-ray diffraction (XRD) was used to determine the mineral composition of the soils. Multivariate statistical analysis and historical data were employed to identify the possible sources of these heavy metals.Results and discussion The mean concentrations of heavy metals were elevated along the Yellow River region and in the southern part of the delta; however, they were generally lower than the Chinese guideline values. As for the depth distribution of heavy metals in soil profiles, the maximum values of Cr, Ni, Cu, Zn, and Cd in middle horizon of cotton field were almost twice than those in surface horizon. The iron oxides and XRD analysis indicated that the trace elements accumulation appeared to be related with the contents of crystalline iron oxide and layer silicates. Historical data from suspended sediments of the Yellow River and principal component analysis (PCA) implied that most of the metals (Cr, Ni, Cu, and Zn) were sourced from natural alluviation and sedimentation. Conclusions The Yellow River Delta soils were slightly polluted by heavy metals the Yellow River Delta. The special pedogenic horizon characterized by higher iron oxides and layered silicates minerals in the middle and lower part of the soil profile was found with heavy metals enrichment, which required to be studied further. Suspended sediments transported by the Yellow River were suggested to be one of the major sources for the heavy metals accumulation in the basal soils of this region.

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“…Different 33 components in soils may contribute to Cd adsorption to different extents. Due to the 34 limitations of experimental techniques (Zachara et al, 1992), it is very difficult to 35 experimentally identify the contribution of individual adsorbents to the control of trace 36 metal adsorption on soil particles. The partition coefficient K p has been widely used to 37 characterize the equilibrium relationship of trace metals between solution and solid 38 phases.…”

Section: Ap United Kingdommentioning

confidence: 99%

Predicting cadmium adsorption on soils using WHAM VI

et al. 2007

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12Cadmium (Cd) adsorption on 14 non-calcareous New Jersey soils was investigated 13 with a batch method. Both adsorption edge and isotherm experiments were conducted 14 covering a wide range of soil composition, e.g. soil organic carbon (SOC) concentration 15 ranging from 0.18% to 7.15%, and varying Cd concentrations and solution pH. by the independent data sets: adsorption isotherm data, which presumably can be used to 25 predict Cd partition equilibrium across a wide range of soil compos itions. The modeling 26 approach presented in this study helps to quantitatively predict Cd behavior in the 27 environment. 28

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Cadmium Sorption to Soil Separates Containing Layer Silicates and Iron and Aluminum Oxides

Cited by 103 publications

References 0 publications

The mobility and bioavailability of trace metals in tropical soils: a review

The mobility and bioavailability of trace metals in tropical soils: a review

Distribution of heavy metals in soils of the Yellow River Delta: concentrations in different soil horizons and source identification

Predicting cadmium adsorption on soils using WHAM VI

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