Binding of Hg to preformed ferrihydrite-humic acid composites synthesized via co-precipitation and adsorption with different morphologies

Liu, Yue; Cheng, Zuqin; Liu, Zhi; Zhou, Shaoqi

doi:10.1016/j.ecoenv.2020.111097

Cited by 11 publications

(7 citation statements)

References 53 publications

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“…The S2/TOC value will be higher under oxygen‐depleted bottom water and/or with high OM flux and lower in sediment with terrestrial OM input (see Figure 4d, shaded area). In this study, continental shelf site EC2005 has the lowest S2/TOC, which is comparable to published continental margin sediment (Holtvoeth et al., 2005), in agreement with the previous estimation which suggests half of the OM at EC2005 is of terrestrial origin (X. Liu et al., 2020). The high TOC variability section at Site 1208 has a wide S2/TOC range, with low S2/TOC corresponding to the two TOC peaks shown in Figure 3f, suggesting a highly degraded nature of OM caused by the low linear sedimentation rate (Figure 4f).…”

Section: Resultssupporting

confidence: 93%

“…Site 1094 is characterized by its young age and high productivity. Site EC2005 is a continental shelf site with half of its TOC of terrestrial origin (X. Liu et al., 2020). The THg/TOC at EC2005 is lower than other open ocean sites but still within the 50–300 ppb/% range (Figure 2e).…”

Section: Resultsmentioning

confidence: 99%

“…This suggests that even though the sedimentary environment is different, after early diagenesis under well‐oxygenated bottom water, the nature of POM tends to be similar, which is also supported by the Rock‐Eval pyrolysis result (Figure 4). The continental shelf site EC2005 has half of its POM of terrestrial origin (X. Liu et al., 2020). Its nature of POM is slightly different from the open ocean sites as indicated by the lower S1/TOC and S2/TOC values.…”

Section: Discussionmentioning

confidence: 99%

“…Based on the results of sequential leaching, the Hg in the high TOC variability section has a trend similar to Fe ox1 , and about 80% of the Hg is bound to OM related phase, making the metal oxide‐OM association being the most probable Hg bounding phase in THg‐enriched section. Compared to minerals whose Hg bounding ability is very low, experimental studies show that Fe‐ and Mn‐oxides coated/co‐precipitated with OM (i.e., metal oxide‐OM association) have Hg adsorption ability greatly enhanced (Zhong & Wang, 2008; Y. Liu et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

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Coupling and Decoupling Between Sedimentary Mercury and Organic Carbon Preservation in the Oxygenated Marine Environment

Qu,

Zhong,

Liu

et al. 2024

Geochem Geophys Geosyst

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Mercury (Hg) enrichment relative to total organic carbon (TOC) in sedimentary records has been widely used as a volcanism proxy. However, the depositional and diagenetic effects on Hg burial are not well understood, limiting the reliability of the proxy. Here, we report a systematic investigation of Hg sedimentation under well‐oxygenated bottom water. Most of the studied cores show total mercury content (THg) to TOC ratio between 50 and 300 ppb/%, including northwest Pacific ODP Site 1208, East Equatorial Pacific ODP Sites 677 and 1241, the Antarctic Zone ODP Site 1094, and East China Sea sediment core EC2005. The consistent THg/TOC ratio confirms the strong coupling between Hg and particulate organic matter (POM) despite large differences in geographic locations, sedimentation rates, TOC content, POM sources, and early diagenetic environments. Nevertheless, the THg/TOC ratio is higher in sediments under well‐oxygenated bottom water than in those under oxygen‐depleted waters, probably as a result of a higher degree of organic matter degradation in oxygenated sediments during early diagenesis. The THg in the high TOC variability section at Site 1208 is abnormally high, resulting in decoupling between Hg and POM. Mercury in this section is still leachable by oxidizing solution and has a similar trend of variability with easily reducible iron content, implying that the metal oxide‐organic matter association might act as Hg bounding phase. We suggest that the enriched Hg is probably supplied by the neighboring high TOC sediment. Therefore, while THg/TOC > 300 ppb/% could be considered as distinct Hg enrichment in sedimentary records, the diagenetic mobilization effect should be first excluded as the possible cause as demonstrated by the records of site 1208. Our study therefore provides new insights into the Hg cycle in the modern ocean and the utilization of Hg enrichment as a volcanism proxy.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Coupling and Decoupling Between Sedimentary Mercury and Organic Carbon Preservation in the Oxygenated Marine Environment

Qu,

Zhong,

Liu

et al. 2024

Geochem Geophys Geosyst

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“…In the vicinity of redox interfaces that are strongly influenced by water levels, such as rice paddies and peatlands, dissolved iron would be oxidized to form a new “reactive iron phase” and forms Fe-OM with organic matter through a variety of actions such as adsorption, co-precipitation, and agglomeration [ 11 , 12 , 13 ]. The co-composition of OM and iron affects the properties of iron oxides in various aspects, such as the specific surface and surface pore size, surface charge, and roughness of the composite surface [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Adsorption of Cd on Iron–Organic Associations Formed by Laccase-Mediated Modification: Implications for the Immobilization of Cadmium in Paddy Soil

Yang

Huang

Xiang

et al. 2022

IJERPH

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The objectives of this study were to evaluate the cadmium adsorption capacity of iron–organic associations (Fe-OM) formed by laccase-mediated modification and assess the effect of Fe-OM on the immobilization of cadmium in paddy soil. Leaf organic matter (OM) was extracted from Changshan grapefruit leaves, and then dissolved organic matter (Lac-OM) and precipitated organic matter (Lac-P) were obtained by laccase catalytic modification. Different Fe-OM associations were obtained by co-precipitation of Fe with OM, Lac-OM, and Lac-P, respectively, and the adsorption kinetics, adsorption edge, and isothermal adsorption experiments of Cd on Fe-OM were carried out. Based on the in situ generation of Fe-OM, passivation experiments on Cd-contaminated soils with a high geological background were carried out. All types of Fe-OM have a better Cd adsorption capacity than ferrihydrite (FH). The theoretical maximum adsorption capacity of the OM-FH, Lac-OM-FH, and Lac-P-FH were 2.2, 2.53, and 2.98 times higher than that of FH, respectively. The adsorption of Cd on Fe-OM is mainly chemisorption, and the -OH moieties on the Fe-OM surface form an inner-sphere complex with the Cd ions. Lac-OM-FH showed a higher Cd adsorption capacity than OM-FH, which is related to the formation of more oxygen-containing groups in the organic matter modified by laccase. The immobilization effect of Lac-OM-FH on active Cd in soil was also higher than that of OM-FH. The Lac-OM-FH formed by laccase-mediated modification has better Cd adsorption performance, which can effectively inactivate the activity of Cd in paddy soil.

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A critical review of the interactions of organic carbon components with soil minerals: Insight from bibliometric analysis of the environmental behaviors of heavy metal(loid)s

Guo

Nkoh

2023

J Soils Sediments

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Binding of Hg to preformed ferrihydrite-humic acid composites synthesized via co-precipitation and adsorption with different morphologies

Cited by 11 publications

References 53 publications

Coupling and Decoupling Between Sedimentary Mercury and Organic Carbon Preservation in the Oxygenated Marine Environment

Coupling and Decoupling Between Sedimentary Mercury and Organic Carbon Preservation in the Oxygenated Marine Environment

Enhanced Adsorption of Cd on Iron–Organic Associations Formed by Laccase-Mediated Modification: Implications for the Immobilization of Cadmium in Paddy Soil

A critical review of the interactions of organic carbon components with soil minerals: Insight from bibliometric analysis of the environmental behaviors of heavy metal(loid)s

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