Influence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid

Wei, Zhanxi; Zhu, Yong; Wang, Yuanyuan; Song, Zefeng; Wu, Yangjie; Ma, Wei; Hou, Yongxia; Zhang, Wenqing; Yang, Yuesuo

doi:10.3390/app12136591

Cited by 6 publications

(5 citation statements)

References 56 publications

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“…The total concentration of Cu and Cd in the compared soil colloid were 1509.99 mg·kg −1 and 869.71 μg·kg −1 , respectively, which were much higher than the total concentration of Cu and Cd in the soil (as described in the Materials and Methods section). This is primarily because soil colloids are the finest, most active component of the soil with a large surface area, and possess strong capabilities for absorbing and retaining heavy metals [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

The Immobilization Mechanism of Inorganic Amendments on Cu and Cd in Polluted Paddy Soil in Short/Long Term

Liu,

Ding,

Lai

et al. 2024

Toxics

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This study investigated the impact of soil colloidal characteristics on the transfer patterns of different Cu and Cd speciation in contaminated soil treated with three different amendments: lime (L), zero-valent iron (ZVI), and attapulgite (ATP). It seeks to clarify the activation hazards and aging processes of these modifications on Cu and Cd. Compared with the control (CK), the available Cu concentrations treated with amendments reduced in the short term (6 months) by 96.49%, 5.54%, and 89.78%, respectively, and Cd declined by 55.43%, 32.31%, and 93.80%, respectively. Over a 12-year period, there was no significant change in the immobile effect with L, while Cu and Cd fell by 19.06% and 40.65% with ZVI and by 7.63% and 40.78% with ATP. Short- and long-term increases in the readily reducible iron and manganese oxide fraction of Cu and Cd were accompanied by a considerable rise in the concentrations of amorphous iron oxide in the soil and colloid after amendment treatment. This suggested that Cu and Cd were immobilized and stabilized in part by amorphous iron oxide.

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Section: Resultsmentioning

confidence: 99%

The Immobilization Mechanism of Inorganic Amendments on Cu and Cd in Polluted Paddy Soil in Short/Long Term

Liu,

Ding,

Lai

et al. 2024

Toxics

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“…Soil colloids, such as clay minerals, soil organic matter (OM), and iron (Fe)/aluminum (Al) (oxy)hydroxide, generally possess a high adsorption capacity for heavy metals [8,9], which means the movement of soil colloids has become an important mechanism for the transport of heavy metals in soil [10,11]. The colloidal transport of heavy metals has been observed by many researchers [12][13][14], and it is significantly influenced by environmental conditions [15,16]. For example, freeze-thaw cycles in soils change the dispersibility of colloids and affect the transport of lead (Pb) [17].…”

Section: Introductionmentioning

confidence: 99%

Influence of Soil Colloids on the Transport of Cd2+ and Pb2+ under Different pH and Ionic Strength Conditions

Ye,

Xu,

Zhong

et al. 2024

Agronomy

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The co-transport of contaminants by soil colloids can generate substantial environmental risk, and this behavior is greatly affected by environmental conditions. In this study, AF4-ICP-MS was used to investigate the size distribution and composition of Cd/Pb-bearing colloids; saturated sand column experiments were used to investigate the impact of soil colloids on the transport of Cd/Pb under different pH and ionic strength conditions. AF4-ICP-MS characterization showed that natural colloids were primarily associated with two sizes ranges: 0.3–35 KDa (F1, fine nanoparticles) and 280 KDa–450 nm (F2, larger nanoparticles), which mainly consisted of organic matter (OM), iron (Fe), and manganese (Mn) (oxy)hydroxides and clay minerals. Fine nanoparticles could strongly adsorb Cd and Pb under all environmental conditions. Mn and Fe (oxy)hydroxides generally formed under neutral to alkaline conditions and exhibited adsorption capabilities for Cd and Pb, respectively. Transport experiments were conducted under different pH and ionic strength conditions. At pH 3.0, soil colloids had little effect on the transport of Cd2+ and Pb2+. At pH 5.0, soil colloids inhibited the transport of Cd2+ by 16.1%, and Pb2+ recovery was still 0.0%. At pH 7.0 and 9.0, soil colloids facilitated the transport of Cd2+ by 15.6% and 29.6%, facilitated Pb2+ by 1.3% and 6.4%. At an ionic strength of 0, 0.005, and 0.01 mol L−1 NaNO3, soil colloids facilitated the transport of Cd2+ by 77.7%, 45.8%, and 15.6%, only facilitated the transport of Pb2+ by 46.2% at an ionic strength of 0 mol L−1 NaNO3. At an ionic strength of 0.05 mol L−1 NaNO3, soil colloids inhibited the transport of Cd2+ and Pb2+ by 33.1% and 21.0%, respectively. The transport of Cd2+ and Pb2+ facilitated by soil colloids was clearly observed under low ionic strength and non-acidic conditions, which can generate a potential environmental risk.

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“…The presence of competing ions in the soil solution directly affects the adsorption dynamics of the elements to the soil colloids Wei et al (2022). The presence of nickel (Ni) and zinc (Zn) in soil solution decreased the adsorption of Cd Yu et al (2023).…”

Section: Introductionmentioning

confidence: 99%

Sequential extraction of cadmium, nikel, and lead in soils from Rio Grande do Sul State, Brazil

Cantão,

Meurer,

Silva

et al. 2024

Cad. Pedagógico

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The evaluation of soil contamination and pollution by trace elements (TEs), such as cadmium (Cd), lead (Pb), and nickel (Ni), should not be based solely on the total content of these elements but also on their availability. The availability of elements in the soil is related to their mobility in solution, their uptake by plants, and consequently their entry into the food chain. The goal of this work was to evaluate, through sequential chemical extractions, the availability of Cd, Pb, and Ni in ten different soil samples from Rio Grande do Sul (Brazil), previously saturated with these elements (1000 mg kg-1). The sequential extractions carried out were for the water-soluble fraction, exchangeable fraction, two organic fractions (extraction with DTPA and NaOH), fraction linked to manganese oxides, fraction linked to poorly crystallized iron oxides, fraction linked to crystallized iron oxides, and the residual fraction. The sequential extraction allowed us to detect differences in the distribution of TEs between soil samples and the conditions under which they were added (with or without competition between Cd, Pb, and Ni in the soil). Sequential extraction helps detect the distribution of Cd, Ni, and Pb in soil fractions. Therefore, it was found that in both non-competitive and competitive systems, Cd presented the greatest environmental risk, as it predominated in the soluble and exchangeable fractions in Ultisol, Oxisol, and Entisol soil types. On the other hand, Pb and Ni can be considered TEs of medium to minimal risk, as they prevailed above 60% in the organic fraction (Pb) in Oxisol, Mollisol, Entisol, and Alfisol soil types, and Pb was found above 50% in residual fractions in Ultisol, Entisol, and Oxisol soil types. Ni was found above 60% in residual fractions in Entisol, Ultisol, Oxisol, and Inceptisol soil types.

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Influence of Soil Colloids on Ni Adsorption and Transport in the Saturated Porous Media: Effects of pH, Ionic Strength, and Humic Acid

Cited by 6 publications

References 56 publications

The Immobilization Mechanism of Inorganic Amendments on Cu and Cd in Polluted Paddy Soil in Short/Long Term

The Immobilization Mechanism of Inorganic Amendments on Cu and Cd in Polluted Paddy Soil in Short/Long Term

Influence of Soil Colloids on the Transport of Cd2+ and Pb2+ under Different pH and Ionic Strength Conditions

Sequential extraction of cadmium, nikel, and lead in soils from Rio Grande do Sul State, Brazil

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