Molecular structure-reactivity correlations of humic acid and humin fractions from a typical black soil for hexavalent chromium reduction

Zhang, Jia; Yin, Huilin; Wang, Hui; Xu, Lin; Barnie, Samuel; Chang, Jingjie; Liu, Fei; Chen, Honghan

doi:10.1016/j.scitotenv.2018.10.165

Cited by 69 publications

(17 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The HS used in this study were obtained by using the ammonoxidation procedure (lignite reacting with oxygen in aqueous ammonia) and resulted in a product with lower hydrophobicity (mainly caused by reduced aromatic compounds) and higher bioactivity than naturally slow-generated HS from lignite [26]. In addition, solid HS contain humin, which has less hydrophilic carboxyl and hydroxyl groups but higher hydrophobic alkyl groups and ash contents [18]. Raw materials also decide HS properties: lignite-derived HS are composed of highly oxidized sulfur-containing molecules and aromatic and aliphatic groups, which can give the products a higher hydrophobic protection than other raw materials (e.g., peat, compost, sludge, leonardite).…”

Section: Discussionmentioning

confidence: 99%

“…However, no research has been found using solid HS in seedling production. Compared with liquid HS, which can be dissolved easily and normally have quick and profound effects on plant growth [13], solid forms of HS containing humin have less intense effects, but they could increase media water holding capacity due to increased cellulose contents, and nutrient retention due to their cation exchange capacity (CEC) with much longer existence in soil solutions [17][18][19], which could make them suitable as supplementary amendments for growing media. Therefore, the potential use of solid HS products with the composition of both HA and humin could improve growing media properties and vegetable seedling quality traits, and the beneficial effects on transplants could last longer, even after field establishment.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Humic Substances Improve Vegetable Seedling Quality and Post-Transplant Yield Performance under Stress Conditions

Qin

Leskovar

2020

Agriculture

View full text Add to dashboard Cite

Vegetable growers require vigorous transplants in order to reduce the period of transplant shock during early stand establishment. Organic media containing solid humic substances (HS) are amendments that have not been comprehensively explored for applications in containerized vegetable transplant production systems. In this study, HS (1% v/v) were applied to a peat-based growth medium to evaluate pre- and post-transplant growth modulation of four economically important vegetable species. Those were: pepper, tomato, watermelon, and lettuce. Seeding for all species was performed in two periods in order to evaluate their post-transplant yield performance under drought (water deficit vs. well-watered) and heat (hot vs. cool season) stresses. Compared with control, HS-treated plants had: (1) increased leaf and root biomass after transplanting due to faster growth rates; (2) lower root/shoot ratio before transplanting, but higher after 10 days of field establishment; and (3) increased root length and surface area. The negative effects of heat and drought stresses on crop yield were more prominent in control plants, while HS-treated transplants were able to mitigate yield decreases. The results clearly demonstrated the benefits of using solid HS as a management input to improve transplant quality in these crop species.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Humic Substances Improve Vegetable Seedling Quality and Post-Transplant Yield Performance under Stress Conditions

Qin

Leskovar

2020

Agriculture

View full text Add to dashboard Cite

show abstract

“…As indicated, the absorbance bands can be found at the bands of 1720, 1639, 1384, 1230 and 1031 cm À1 , which can be attributed to carboxyl, carbonyl, methyl, phenol and hydroxyl respectively. [36][37][38][39][40][41][42][43] Because the methyl has been determined to be relatively resistant to Cr(VI) oxidation, 44,45 the ratios of absorbances at other functional groups bands to the absorbance of methyl were used to indicate the variation of carboxyl, carbonyl, phenol and hydroxyl, and the results are shown in Fig. S16 and S17.…”

Section: Adsorption-reduction Mechanism Of Cr(vi) Retentionmentioning

confidence: 99%

Mechanism and modeling of hexavalent chromium interaction with a typical black soil: the importance of the relationship between adsorption and reduction

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Dissolved organic matter can also form water-soluble complexes with Cr(VI) and Cr(III) to enhance their mobility (Weng et al 2002). The undissolved organic matter can provide active sites for the adsorption of Cr(VI) and electrons for the reduction of Cr(VI), which plays a major role in the retention of Cr(VI) migration (Barnie et al 2018;Zhang et al 2019b;Zhang et al 2018b). In addition, pH also has an important influence on the migration of Cr(VI).…”

Section: Introductionmentioning

confidence: 99%

New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

Wei

Tang

et al. 2021

Environ Earth Sci

Self Cite

View full text Add to dashboard Cite

Chromite ore processing residue (COPR) storage sites are widely distributed all over the world, causing serious soil and groundwater pollution. However, the differences in soil constituents and properties between different regions are significant, and the dynamic migration and transformation of Cr(VI) in different types of soil under alkaline condition of the COPR site is still unclear. In this study, the typical black soil, red soil and loess in different regions of China were chosen to investigate the adsorption kinetics and thermodynamics of Cr(VI) under the original pH conditions of the soil, and then the alkaline Cr(VI) solution was introduced into the soil column to simulate the dynamic migration and transformation process of Cr(VI) at COPR sites. According to the results, the Cr(VI) breakthrough curve predicted by the solid-liquid distribution coefficient Kd based on the static isotherm adsorption experiments significantly underestimated and overestimated the retention effect of black soil and red soil on Cr(VI) dynamic migration, respectively. For the black soil, the retention of Cr(VI) was dominated by Cr(VI) reduction, which is a slow reaction compared with Cr(VI) adsorption. Therefore, the reduction kinetics process during the column experiment cannot be neglected. In respect to the red soil, the outlet Cr(VI) concentration turned to be higher than the inlet concentration with the soil alkalization, which indicated that the adsorbed Cr(VI) desorbed again, and this is the main reason for the overestimation of Cr(VI) retention effect by the red soil. This study shows that the environmental risks of Cr in different types of soil are quite different, mainly related to the valence and occurrence form of Cr that governed by the soil constituents and properties. In addition, 2 the stable form of Cr in the black soil column after the reaction indicates that the soil organic matter can be used as a potential environmentally friendly remediation material for Cr(VI) contaminated soils at COPR sites.

show abstract

Molecular structure-reactivity correlations of humic acid and humin fractions from a typical black soil for hexavalent chromium reduction

Cited by 69 publications

References 56 publications

Humic Substances Improve Vegetable Seedling Quality and Post-Transplant Yield Performance under Stress Conditions

Humic Substances Improve Vegetable Seedling Quality and Post-Transplant Yield Performance under Stress Conditions

Mechanism and modeling of hexavalent chromium interaction with a typical black soil: the importance of the relationship between adsorption and reduction

New insight into mechanism of Cr(VI) migration and transformation in typical soils of chromite ore processing residue (COPR) contaminated sites

Contact Info

Product

Resources

About