Role of Humic Acid and Quinone Model Compounds in Bromate Reduction by Zerovalent Iron

2005 ◽  
Vol 39 (4) ◽  
pp. 1092-1100 ◽  
Author(s):  
Li Xie ◽  
Chii Shang
Keyword(s):  
Humic Acid ◽  
Zerovalent Iron ◽  
Model Compounds ◽  
Bromate Reduction

Near edge X-ray absorption fine structure (NEXAFS) of model compounds for the humic acid/actinide ion interaction

2005 ◽  
Vol 148 (3) ◽  
pp. 151-157 ◽  
Author(s):  
Markus Plaschke ◽  
Jörg Rothe ◽  
Marcus Altmaier ◽  
Melissa A. Denecke ◽  
Thomas Fanghänel
Keyword(s):  
Fine Structure ◽  
Humic Acid ◽  
Model Compounds ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

The Role of Humic Acid Application on Quantitative and Qualitative Traits of Faba Bean (Vicia faba L.)

2021 ◽  
Author(s):  
Samaneh Roudgarnejad ◽  
Morteza Samdeliri ◽  
Amirabas Mousavi Mirkalaei ◽  
Mojtaba Nasheai Moghaddam
Keyword(s):  
Humic Acid ◽  
Vicia Faba ◽  
Faba Bean ◽  
Qualitative Traits ◽  
Vicia Faba L ◽  
Quantitative And Qualitative Traits

Co-transport of U(VI) and gibbsite colloid in saturated granite particle column: Role of pH, U(VI) concentration and humic acid

2019 ◽  
Vol 688 ◽  
pp. 450-461 ◽  
Author(s):  
Junwei Yang ◽  
Zhen Zhang ◽  
Zongyuan Chen ◽  
Mengtuan Ge ◽  
Wangsuo Wu ◽  
...  
Keyword(s):  
Humic Acid

scholarly journals Role of Organic Acids on Phosphorus Fractions in Silty Clay Loam Soil

2018 ◽  
Vol 8 (2) ◽  
pp. 12-21
Author(s):  
Abdulmahdi S.ALansari ◽  
Muhammad M.Yassin ◽  
Mahdi W.Seheib
Keyword(s):  
Humic Acid ◽  
Organic Acids ◽  
Incubation Period ◽  
Total Phosphorus ◽  
Phosphate Fertilizer ◽  
Silty Clay ◽  
Clay Loam ◽  
Silty Clay Loam ◽  
Fertilized Soil

This study was conducted to evaluation the role of the organic acids in the phosphorus fractions in silty clay loam texture. The laboratoryexperiment was conducted by adding the organic acids (Humic acid ,Citric acid ,Oxalic acid , Malic acid ,Acetic acid and Lactic acid )to the fertilized soil with conc. super phosphate fertilizer with 100 kg h-1 level with concentrations (0,15,30,45 and60)mg L-1,except Humic acid (500,1000,1500 and 2000) mg L-1.The soil was incubated at 30 C for 14,28,42,56 and 70 days period and the keep of field capacity about of incubation period during the daily weight.Amount of available ,mineral ,organic and total phosphorus after each incubated period were measured. The results showed that theaddition of organic acids of Humic acid ,Citric acid ,Oxalic acid and Malic acid were caused to increaseamount of available ,mineral ,organic and constant of total phosphorus in fertilized soil with conc. super phosphate fertilizer and increased its amount with increasing of organic acid concentration and better of Humic acid 2000mg L-1 significanton all the treatments .The results of the study that theaddition of organic acids were caused to increase amount of available and mineral phosphorus with increasing of incubation period and constant amount of total phosphorus and decreasing of organic phosphorus amount and available for only soil and only fertilizer treatment during increasing of incubation period .The organic acids can be arranged according to its ability toincrease the availabilityof the phosphorus as follow :

scholarly journals The Role of Carboxyl and Hydroxyl Groups of Humic Acid in Removing AuCl4- from Aqueous Solution

2017 ◽  
Vol 17 (1) ◽  
pp. 95 ◽  
Author(s):  
Sri Sudiono ◽  
Mustika Yuniarti ◽  
Dwi Siswanta ◽  
Eko Sri Kunarti ◽  
Triyono Triyono ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Peat Soil ◽  
Sharp Decrease ◽  
Hydroxyl Groups ◽  
Mixed Solution ◽  
Oh Groups ◽  
Characterization Result ◽  
Ft Ir

Humic acid (HA) extracted from peat soil according to the recommended procedure of the International Humic Substances Society (IHSS) has been tested to remove AuCl4- from aqueous solution. The removal was optimum at pH 2.0 and it was mainly dictated by attachment through hydrogen bonding to unionized carboxyl (–COOH) groups and reduction by the action of the hydroxyl (–OH) groups to gold (Au) metal. The removal of AuCl4- improved after HA was purified through repeated immersion and shaking in a mixed solution containing 0.1 M HCl and 0.3 M HF. When the purification led to the sharp decrease in ash content from 39.34 to 0.85% (w/w) and significant increase in both the –COOH and –OH contents from 3240 to 3487 mmol/kg and from 4260 to 4620 mmol/kg, respectively; the removal of AuCl4- improved from 0.105 to 0.133 mmol/g. This improvement of AuCl4- removal by the purified HA was accompanied by higher ability in reduction to Au metal. The attached AuCl4- on –COOH groups of both crude and purified HAs was qualitatively observed by the characterization result of FT-IR spectroscopy, while the presence of Au metal on the surface of those HAs was verified by the characterization result of XRD.

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