Adsorption and desorption of divalent mercury (Hg2+) on humic acids and fulvic acids extracted from typical soils in China

2009 ◽  
Vol 335 (1-3) ◽  
pp. 194-201 ◽  
Author(s):  
Jie Zhang ◽  
Jiulan Dai ◽  
Renqing Wang ◽  
Fasheng Li ◽  
Wenxing Wang
Keyword(s):  
Humic Acids ◽  
Fulvic Acids ◽  
Adsorption And Desorption

Adsorption and desorption properties of three types of agricultural humic acids for K+

2011 ◽  
Vol 37 (1) ◽  
pp. 103-106
Author(s):  
Jian-xin LUO ◽  
Wei GUO ◽  
Hui YAN ◽  
Qiong YANG ◽  
Xin-liang DONG ◽  
...  
Keyword(s):  
Humic Acids ◽  
Adsorption And Desorption

scholarly journals Characterization of Soil Organic Matter Individual Fractions (Fulvic Acids, Humic Acids, and Humins) by Spectroscopic and Electrochemical Techniques in Agricultural Soils

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1067
Author(s):  
Aleksandra Ukalska-Jaruga ◽  
Romualda Bejger ◽  
Guillaume Debaene ◽  
Bożena Smreczak
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Sorption Properties ◽  
Aliphatic Chains

The objective of this paper was to investigate the molecular characterization of soil organic matter fractions (humic substances (HS): fulvic acids-FAs, humic acids-HAs, and humins-HNs), which are the most reactive soil components. A wide spectrum of spectroscopic (UV–VIS and VIS–nearIR), as well as electrochemical (zeta potential, particle size diameter, and polydispersity index), methods were applied to find the relevant differences in the behavior, formation, composition, and sorption properties of HS fractions derived from various soils. Soil material (n = 30) used for the study were sampled from the surface layer (0–30 cm) of agricultural soils. FAs and HAs were isolated by sequential extraction in alkaline and acidic solutions, according to the International Humic Substances Society method, while HNs was determined in the soil residue (after FAs and HAs extraction) by mineral fraction digestion using a 0.1M HCL/0.3M HF mixture and DMSO. Our study showed that significant differences in the molecular structures of FAs, Has, and HNs occurred. Optical analysis confirmed the lower molecular weight of FAs with high amount of lignin-like compounds and the higher weighted aliphatic–aromatic structure of HAs. The HNs were characterized by a very pronounced and strong condensed structure associated with the highest molecular weight. HAs and HNs molecules exhibited an abundance of acidic, phenolic, and amine functional groups at the aromatic ring and aliphatic chains, while FAs mainly showed the presence of methyl, methylene, ethenyl, and carboxyl reactive groups. HS was characterized by high polydispersity related with their structure. FAs were characterized by ellipsoidal shape as being associated to the long aliphatic chains, while HAs and HNs revealed a smaller particle diameter and a more spherical shape caused by the higher intermolecular forcing between the particles. The observed trends directly indicate that individual HS fractions differ in behavior, formation, composition, and sorption properties, which reflects their binding potential to other molecules depending on soil properties resulting from their type. The determined properties of individual HS fractions are presented as averaged characteristics over the examined soils with different physico-chemical properties.

Characteristics of isothermal adsorption and desorption of aluminum ion to/from humic acids

2008 ◽  
Vol 20 (5) ◽  
pp. 579-584 ◽  
Author(s):  
Qiang WANG ◽  
Shiqiang WEI ◽  
Yuming HUANG ◽  
Jinzhong ZHANG
Keyword(s):  
Humic Acids ◽  
Isothermal Adsorption ◽  
Adsorption And Desorption ◽  
Aluminum Ion

Humus Substances and Soil Structure

2012 ◽  
Vol 63 (3) ◽  
pp. 31-36
Author(s):  
Erika Tobiašová ◽  
Juraj Miškolczi
Keyword(s):  
Humic Acids ◽  
Soil Structure ◽  
Size Fraction ◽  
Fulvic Acids ◽  
Optical Parameters ◽  
Humus Substances ◽  
Haplic Chernozems ◽  
Positive Correlations ◽  
The Stability

Abstract In this study, the soil structure of two soil types (Haplic Chernozems and Eutric Fluvisols) in four ecosystems (forest, meadow, urban and agro-ecosystem) with dependence on humus substances were compared. The stability of dry-sieved and waterresistant macro-aggregates and micro-aggregates with a dependence on the proportion of humus substance fractions was determined. Quantity of humus substances influenced mainly water-resistant aggregates. A positive correlation was recorded between size fraction of 2.3 mm and contents of humus substances (P < 0.01; r = +0.710) and fulvic acids (P < 0.05; r = +0.634), and negative correlation between size fraction of 0.5.1 mm and contents of humus substances (P < 0.05; r = -0.613) and fulvic acids (P < 0.01; r = -0.711). Humic acids influenced mainly the formation of dry-sieved aggregates and fulvic acids played an important role in micro-aggregate formation. The quality of humus substances influenced more intensively the formation of dry-sieved aggregates. There were positive correlations between optical parameters of humus substances and humic acids and larger dry-sieved aggregates (3.7 mm) and negative correlations with smaller (0.5.3 mm). The highest proportions of larger size of water-resistant aggregates (1. 20 mm) were in forest ecosystem, but smaller (0.25.1 mm) agreggates were dominated in agro-ecosystem.

scholarly journals Metal Binding and Sources of Humic Substances in Recent Sediments from the Cananéia-Iguape Estuarine-Lagoon Complex (South-Eastern Brazil)

2021 ◽  
Vol 11 (18) ◽  
pp. 8466
Author(s):  
Christian Millo ◽  
Carlo Bravo ◽  
Stefano Covelli ◽  
Elena Pavoni ◽  
Elisa Petranich ◽  
...  
Keyword(s):  
Organic Matter ◽  
Trace Metals ◽  
Humic Substances ◽  
Humic Acids ◽  
Metal Binding ◽  
Binding Capacity ◽  
Stable Carbon Isotope ◽  
Fulvic Acids ◽  
Freshwater Environment ◽  
Estuarine Lagoon

The Cananéia-Iguape estuarine–lagoon complex (São Paulo state, Brazil) is a natural laboratory to study metal binding by humic substances (HS) in subtropical settings. This transitional environment is evolving into a freshwater environment due to water input from the Ribeira River, funneled through the Valo Grande Canal (Iguape). Past mining activities in the Ribeira River basin and maritime traffic are suspected to be potential sources of trace metals in the system. In this study, the trace metal contents of Free Humic Acids (FHA), Bound Humic Acids (BHA), and Fulvic Acids (FA) extracted from sedimentary organic matter were investigated. Moreover, the sources of HS were traced using their stable carbon isotope compositions and C/N ratios. The results suggested a mixed marine–terrestrial source of FHA, BHA, and FA. Copper and Cr were the most abundant trace metals bound to HS. On average, Cu showed concentrations of 176, 115, and 37.9 μg g−1 in FHA, BHA, and FA, respectively, whereas Cr showed average concentrations of 47.4, 86.3, and 43.9 μg g−1 in FHA, BHA, and FA, respectively. Marine FHA showed the highest binding capacity for trace metals, whereas terrestrial FA derived from the decay of mangrove organic matter showed the lowest binding capacity.

scholarly journals Ácidos húmicos para obtenção de maior massa fresca inicial em plantas de feijão comum ‘Pérola’

2016 ◽  
Vol 11 (2) ◽  
pp. 06
Author(s):  
Lincon Rafael da Silva ◽  
Matheus Garcia Guimarães ◽  
Roberto José de Freitas ◽  
Adilson Pelá ◽  
Daniel Diego Costa Carvalho
Keyword(s):  
Common Bean ◽  
Humic Acids ◽  
Aerial Part ◽  
Fulvic Acids ◽  
Regression Equations ◽  
Fresh Matter ◽  
Randomized Design ◽  
Bean Plants ◽  
Quadratic Response ◽  
Common Bean Plants

<p>Objetivou-se avaliar diferentes doses de ácidos húmicos na obtenção de massa fresca inicial de plantas de feijão comum ‘Pérola’. Para tanto, sementes de feijão foram tratadas com Rhal S1<sup>®</sup> (18% de ácidos húmico + 1,5% de ácidos fúlvicos) nas doses de 0, 100, 200, 300, 400 e 500 mL da solução para cada 100 kg de sementes. Em seguida, as sementes foram semeadas em vasos de 500 g de capacidade e após 14 dias de cultivo em casa de vegetação, foram mensurados a massa fresca da parte aérea e massa fresca das raízes. O experimento foi disposto em delineamento inteiramente casualizados (DIC)com quatro repetições (1 planta por vaso; 4 plantas por tratamento)e os resultados foram submetidos, à análise de regressão. As equações de regressão obtiveram resposta quadrática para todas a variáveis analisadas em função das doses aplicadas. As plantas de feijão responderam pelo aumento de massa fresca da parte aérea até a dose de 200 mL de Rhal S1<sup>®</sup> 100 Kg<sup>-1</sup> sementes, enquanto que amassa fresca das raízes respondeu até a dose de 100 mL de Rhal S1<sup>®</sup> 100 Kg<sup>-1</sup> sementes, confirmando maior demanda da parte aérea por ácidos húmicos do que as raízes.</p><p align="center"><strong><em>Humic acids to </em></strong><strong><em>obtain higher early fresh matter in ‘Pérola’ common bean plants</em></strong></p><p><strong>Abstract: </strong>It is aimed to evaluate different doses of humic acidto obtain early fresh matter of ‘Pérola’ common bean plants. Therefore, common bean seeds were treated with Rhal S1<sup>®</sup> (18% of humic acid + 1.5% of fulvic acids) at doses of 0, 100, 200, 300, 400 and 500 mL of solution for each 100 kg seeds. Just after, the seeds were sown in 500 g capacity pots and after 14-days cultivation in greenhouse, it was measured the fresh matter of the aerial part and fresh matter of the roots. The experiment was carried out in completely randomized design (CRD) with four replicates (1 plant per pot; 4 plants per treatment) and the results of the two experiments were subjected, together, to regression analysis. The regression equations obtained quadratic response for all variables evaluated in function of the applied doses. The common bean plants respond by the increasing of fresh matter of aerial part up to 200 mL of Rhal S1<sup>®</sup> 100 Kg<sup>-1</sup> seeds, while the fresh matter ot the roots increasing up to 100 mLof Rhal S1<sup>®</sup> 100 Kg<sup>-1</sup> seeds, confirming greater demand of shoots by humic acids than the roots.</p>

scholarly journals Sustainability/resilience of soil organic matter components in an Argentinean arid region .

2014 ◽  
Vol 2 ◽  
Author(s):  
Carolina Vázquez ◽  
Laura Noe ◽  
Adriana Abril ◽  
Carolina Merlo ◽  
Carlos Romero ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Humic Substances ◽  
Humic Acids ◽  
Arid Region ◽  
Management Practices ◽  
Agricultural Soils ◽  
Fulvic Acids ◽  
Soil Sustainability ◽  
Undisturbed Site

This short communication presents a novel approach to determining the soil sustainability of productive practices in an Argentinean arid region, using the resilience degree of soil organic matter components. The study was conducted in four sites of the Arid Chaco region of the Cordoba province: one undisturbed site, two sites with livestock (with total and with selective clearing) and one site with agriculture. In each site three soil samples were taken and total soil organic matter, fulvic and humic acids, and non-humic substances were analyzed. Variations of each component (%) between each productive practice and the undisturbed site were calculated in order to establish the resilience degree. The livestock soils showed: a) moderate resilience for non-humic substances, b) low resilience for organic matter and humic acids, and c) no resilience for fulvic acids. The agricultural soils showed: a) low resilience for total organic matter and non-humic substances, and b) no resilience for fulvic and humic acids. We conclude that this approach is a powerful tool for establishing management practices according to each particular situation, allowing improved productivity in arid regions.

Sign in / Sign up

Export Citation Format

Share Document