Influence of organic acid and amino acid on cadmium and lead desorption from soil

Soil Research ◽  
2007 ◽  
Vol 45 (7) ◽  
pp. 554 ◽  
Author(s):  
S. Chen ◽  
L. N. Sun ◽  
L. Chao ◽  
Q. X. Zhou ◽  
T. H. Sun
Keyword(s):  
Heavy Metals ◽  
Amino Acid ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Organic Acid ◽  
Functional Group ◽  
North East ◽  
Amino Acid Histidine ◽  
Cadmium And Lead ◽  
Amino Acid Concentrations

A study was conducted to investigate the influence of organic acid (citric acid, oxalic acid) and amino acid (histidine) on the desorption of cadmium and lead from artificial contaminated soil in north-east China. Results showed that when the concentration of organic acid and amino acid in desorption solution was relatively low, the presence of organic ligands inhibited the desorption behaviour of Cd. When organic acid and amino acid concentrations were higher (>2 mmol/L), the presence of organic acid and amino acid obviously promoted Cd desorption. The increment of citric acid, oxalic acid, and histidine concentration significantly (P < 0.01) accelerated the desorption of Pb. The influence of organic acid and amino acid on the desorption behaviour of Cd and Pb followed the same sequence: citric acid > oxalic acid > histidine. This revealed that the organic acids had stronger affinity with heavy metals than that of amino acids. Functional group positions and types were important in determining if an organic acid or an amino acid would complex metals and increase their potential leaching. The results of this work implicated that amendment of organic acid and amino acid would enhance conditionally the bioavailability of heavy metals adsorbed by soils, relying on the type and concentration of organic acid and amino acid in soil solution.

The Combination of Na2EDTA and Reducing Organic Acid on Remediation of Soil Contaminated by Heavy Metals

2017 ◽  
Vol 744 ◽  
pp. 531-535 ◽  
Author(s):  
Meng Wei ◽  
Jia Jun Chen ◽  
Yun Song Liu
Keyword(s):  
Heavy Metals ◽  
Ascorbic Acid ◽  
Oxalic Acid ◽  
Organic Acid ◽  
Chelating Agent ◽  
Washing Process ◽  
Removal Efficiencies ◽  
Cadmium And Lead ◽  
Remediation Of Soil ◽  
Metal Smelter

Washing tests using a typical chelating agent (Na2EDTA) and two reducing organic acids (oxalic and ascorbic acid) were conducted to remediate soil contaminated by heavy metals at a former metal smelter. Removal efficiencies of arsenic, cadmium, copper and lead under Na2EDTA washing enhanced by reducing organic acid were tested with washing time and steps. Results showed that the addition of reducing acid increased the overall removal efficiencies of metals in some extent. The combination of Na2EDTA and oxalic acid was effective in removing arsenic and copper, while the combination of Na2EDTA and ascorbic acid was more effective in removing cadmium and lead. Washing process included the rapid desorption (20~60 min) and the rate-limited dissolution. Most available contents of metals were extracted within an hour. Multi-step washing was more effective than single washing. However, secondary washing was sufficient for remediation. So the washing conditions should be identified prudently.

The Effect of Organic Matter and Organic Acid on the Chromium Release in Sediment

2014 ◽  
Vol 1081 ◽  
pp. 88-92
Author(s):  
Hui Liu ◽  
Jiu Lan Dai
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Citric Acid ◽  
Organic Acid ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Soluble Starch ◽  
Optimal Dosage ◽  
Tetraacetic Acid ◽  
Adsorption Time ◽  
Chromium Release

Effect of organic matter and organic acid on the heavy metals, especially, chromium (Cr) release in the sediment was researched. Glucose and soluble organic starch was used as organic matter, as well, citric acid and ethylene diamine tetraacetic acid (EDTA) were simulated as organic acid. The results showed that best adsorption time of glucose on Cr was 5h, the optimal dosage was 0.1g g-1; best adsorption time of organic soluble starch was 4h, and the optimum adding amount of 0.08g/g; best adsorption time of citric acid was 5h, the best concentration 0.005mol g-1; optimal adsorption time of organic acid EDTA was 3h, the optimum adding amount of 0.12g g-1. Glucose, soluble starch and citric acid significantly effected on the release of Cr in the sediment, however, influence of EDTA on the release of Cr was not so evident.

Impact of solution variables on the removal of heavy metals from wastewaters by a recycled iron sorbent

2000 ◽  
Vol 42 (1-2) ◽  
pp. 347-352
Author(s):  
E.H. Smith ◽  
S. Chatterjee
Keyword(s):  
Heavy Metals ◽  
Oxalic Acid ◽  
Metal Speciation ◽  
Surface Finishing ◽  
Complexing Agents ◽  
Lead Removal ◽  
Adsorption Equilibria ◽  
Removal Of Heavy Metals ◽  
Cadmium And Lead ◽  
The Impact

Waste shot-blast fines from surface finishing processes have been demonstrated to be effective for removing heavy metals from solution by adsorption.The technology offers the potential for inexpensive recovery and reuse of a material normally discarded as a solid waste. While metal removals compare favorably with those achieved by commercial sorbents, applications issues such as the impact of background metal-complexing agents require investigation. The presence of oxalic acid, a complexing organic compound, impacted cadmium and lead adsorption in accordance with predictions from metal speciation equilibria; i.e., a small but measurable reduction in lead removal was observed, but cadmium adsorption was relatively unaffected. The effects were repeated in dynamic column experiments, with lead removals reduced by 15 to 20% in the presence of the ligand. Efforts to model adsorption equilibria in the presence of oxalic acid did not fully capture the reduced lead removal, presumably because the model does not consider the complete formation of metal-oxalic acid complexes prior to contact with the sorbent.

Effects and Mechanism of Organic Acids on Aluminum Availability of Dark Brown Forest Soil

2011 ◽  
Vol 393-395 ◽  
pp. 709-712 ◽  
Author(s):  
Fu Xing Cui ◽  
Jin Feng Song ◽  
Ya Fen Guo ◽  
Jin Zhong Xu
Keyword(s):  
Citric Acid ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Organic Acid ◽  
Forest Soil ◽  
Dissociation Constants ◽  
Organic Salt ◽  
Brown Forest Soil ◽  
Organic Salts ◽  
Complexation Reactions

The effects and mechanism of different concentration organic acids and organic salts solution on Al availability of dark brown forest soil were studied. It was resulted that, oxalic acid/oxalate and citric acid/citrate substantially stimulated soil Al release of dark brown forest soil. The effect of organic acids/salts on Al release would be strengthen with increasing of their concentrations.The contents of Al released from A1 horizon was higher than that from B horizon. Organic salt solutions had much higher effects than organic acid the same in concentration, i.e. citrate>citric acid, oxalate>oxalic acid. Therefore, the mechanism of organic acid/salts triggering release of soil Al was assumed to be dominated by complexation reactions of organic anions. Citric acid/ citrate had much higher effect than oxalic acid/ oxalate at same concentration to A1 and B horizons, i.e. citrate> oxalate, citric acid>oxalic acid, which was primarily related with the greater complexing capacities and dissociation constants of citric acid.

scholarly journals Organic Acid Profile of “Batuan” (Garcinia binucao [Blco] Choisy) Fruit

2017 ◽  
pp. 25-33 ◽  
Author(s):  
Elizabeth Quevedo ◽  
Erlinda Dizon ◽  
Florinia Merca
Keyword(s):  
Acetic Acid ◽  
Lactic Acid ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Organic Acid ◽  
Fumaric Acid ◽  
Mobile Phase ◽  
Fruit Samples ◽  
Organic Acid Profile

“Batuan” fruit (Garcinia binucao [Blco.] Choisy), an indigenous acidulant grown in the Visayas State University, Baybay City, Leyte was analyzed for its organic acid profile at different stages of maturity for the development of potential food and non-food products. The analysis of organic acid content was done using Reverse Phase-High Performance Liquid Chromatography. Organic acids in the dried, powdered “batuan” fruit samples were extracted with the mobile phase (50mM KH2PO4/ H3PO4, pH2.8). The sample extracts and organic acid standards (oxalic acid, tartaric acid, malic acid, citric acid, fumaric acid, lactic acid, acetic acid, and succinic acid) were injected to RP-HPLC under isocratic elution with the mobile phase at a flow rate of 1.0mL min-1 and using UV-vis detection at 210nm. “Batuan” fruit samples contain oxalic acid, tartaric acid, malic acid, citric acid, fumaric acid, succinic acid, acetic acid, lactic acid, and a few unidentified organic acids. Among the organic acids present, citric acid accumulated the highest in the ripe “batuan” fruit; fumaric acid, the least. Results of this study show that “batuan” fruit could be a good natural source of acidulant for food and non-food applications.

SPATIAL AND TEMPORAL DISTRIBUTION OF BACTERIAL COMMUNITIES AND HEAVY METALS (CR, CD AND PB) COMPOSITION IN SEDIMENTS ALONG PAHANG RIVER, MALAYSIA

2015 ◽  
Vol 77 (24) ◽  
Author(s):  
Mohd Huzaimi Mohd Amin ◽  
Ahmed Jalal Khan Chowdhury ◽  
Kamaruzzaman Yunus ◽  
Noor Faizul Hadry Nordin
Keyword(s):  
Heavy Metals ◽  
Bacterial Communities ◽  
Monsoon Season ◽  
Temporal Distribution ◽  
Dry Weight ◽  
Bacterial Colony ◽  
Nutrient Contents ◽  
North East ◽  
Colony Number ◽  
Cadmium And Lead

Bacterial communities show complex and sensitive response towards the environmental stimulation. Pahang River is one of the important inland aquatic biodiversity resources that provide food and excellent habitat for many organisms including microorganisms. Higher bacterial diversity is assumed to increase ecosystem capacity to resist and recover from perturbation. Hence, it is important to assess the impacts of heavy metals composition towards distribution of bacteria in sediments along Pahang River. A study on heavy metals composition such as chromium, cadmium and lead was carried out along the Pahang River using Teflon Bomb digestion processes and were analyzed using ICP-MS. Overall 19 sampling areas along Pahang River with frequency of 20-30 km for each site were chosen as our sampling stations. Sampling was conducted during pre and post of North-East monsoon season. The average dry weight concentration for chromium (Cr) was found between 3.250 and 21.950 µg/g, cadmium (Cd) ranged from 0.019 to 0.403 µg/g and lead (Pb) 8.024 to 20.660 µg/g. The bacterial community in sediments along Pahang River was determined using culture-based method. The bacterial colony-forming unit (CFU) range was found between 1013.33 CFU/g and 28826.67 CFU/g. This study demonstrated that the concentration of heavy metals and bacterial colony number different at each station during pre and post-monsoon. Apart from that, the heavy metals composition can influence the changes of bacterial colony number. However this changes also influence by other factors such as physicochemical parameters, sediments size, nutrient contents in the river and also sediments and water run-off. The condition of Pahang River is still conducive and activities that causing pollution should be stopped.

scholarly journals Phytoextraction of heavy metal from sewage sludge by plants

2010 ◽  
Vol 58 (5) ◽  
pp. 27-34
Author(s):  
Jaroslava Bartlová ◽  
Barbora Badalíková ◽  
Jan Hrubý ◽  
Vasil Gjurov
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Aboveground Biomass ◽  
Treatment Plant ◽  
Sweet Clover ◽  
Mining Operations ◽  
Lead And Cadmium ◽  
North East ◽  
Average Annual Temperature ◽  
Cadmium And Lead

In 2008 and 2009, studies made contents of cadmium and lead in the soil and their uptake by non-traditional plants were studied in a small-plot trial. At the same time also the effect of bio-algeen preparations on phytoextraction of heavy metals by these plants was investigated. Experimental plots were established on the reclaimed land after closing down mining operations in the town of Žacléř (North-East Bohemia) where a layer of sewage sludge from a wastewater treatment plant 0.6–0.8 m thick was subsequently applied. The locality is situated in the altitude of 612 m, its average annual temperature is about 6.8 °C and the mean annual precipitations are 857 mm. Analyses revealed higher concentrations of heavy metals in the applied sewage sludge. The average concentrations of lead and cadmium were 180 mg . kg−1 and 6.89 mg . kg−1, respectively. The experiment had two variants: Variant 1 – sewage sludge without any other substances, and Variant 2 – sewage sludge + bio-algeen preparations (B. A. S-90 or B. A. Root Concentrate). To find the most suitable plant species for the phytoextraction of cadmium and lead, the following non-traditional plants were cultivated in both variants: fodder mallow (Malva verticillata L.), rye (Secale cereale L. var. multicaule METZG. ex ALEF.) and white sweet clover (Melilotus alba MEDIC.). The highest accumulation of cadmium and lead in the aboveground biomass was found out in rye, viz 14.89 mg . kg−1 DM and 14.89 mg . kg−1 DM of Cd and Pb, respectively., As compared with other plants under study, white sweet clover exhibited the significantly lowest capability to extract both heavy metals from soil (viz 0.22 and 3.20 mg . kg−1 DM of Cd and Pb, respectively). A positive effect of bio-algeen on phytoextraction of cadmium and lead was evident in all plants. The highest yield of aboveground biomass was recorded on the plot with white sweet clover with added alginate (496 g . m−2). Of plants under study, the fodder mallow seems to be the most suitable crop for the phytoextraction of both metals (0.35 and 5.87 mg . m−2 of Cd and Pb, respectively).

scholarly journals Sugars, organic acids, minerals and lipids in jabuticaba

2011 ◽  
Vol 33 (2) ◽  
pp. 540-550 ◽  
Author(s):  
Annete de Jesus Boari Lima ◽  
Angelita Duarte Corrêa ◽  
Ana Maria Dantas-Barros ◽  
David Lee Nelson ◽  
Ana Carolina Lourenço Amorim
Keyword(s):  
Acetic Acid ◽  
Citric Acid ◽  
Oxalic Acid ◽  
Organic Acids ◽  
Organic Acid ◽  
Succinic Acid ◽  
Malic Acid ◽  
Seed Oil ◽  
Reducing Sugars ◽  
Mineral Compositions

The aim of this work was to determine the sugar, organic acid and mineral compositions of the whole fruit and fractions (skin, pulp and seed) of the Paulista (Plinia cauliflora) and Sabará (Plinia jaboticaba) jabuticaba tree genotypes, as well as the oil compositions of their skin and seeds. High levels of sugar, especially fructose, followed by glucose and sucrose, were encountered in the fruit. In the Paulista genotype, higher levels of total and reducing sugars were found in the pulp and skin, which was not observed when comparing the whole fruit of both genotypes. Five organic acids were found in the whole fruit and in the fractions of the two jabuticaba genotypes in quantitative order: citric acid > succinic acid > malic acid > oxalic acid > acetic acid. Potassium was the most abundant mineral found. This fruit was also shown to be rich in magnesium, phosphorus, calcium and copper. The seed oil had nearly the same constitution as the oil extracted from the skin in both genotypes and the major compounds were an unidentified phytosterol, palmitic, linoleic and oleic acids, and squalene.

Sign in / Sign up

Export Citation Format

Share Document