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

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

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.

HUMUS FRACTION RATIOS AS A MEANS OF DISCRIMINATING BETWEEN HORIZON TYPES

1980 ◽  
Vol 60 (2) ◽  
pp. 219-229 ◽  
Author(s):  
L. E. LOWE
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Carbon Content ◽  
Fulvic Acid ◽  
Soil Classification ◽  
Acid Fraction ◽  
Humus Fraction ◽  
Wide Range ◽  
Fraction Distribution

Humus fraction distribution in a wide range of horizon samples was examined by measuring carbon content in humic acid (Ch), in fulvic acid (Cf) and in the strongly colored polyphenolic component of the fulvic acid fraction (Ca). Fraction distribution was described by the ratios Ch/Cf and Ca/Cf. It was concluded that humus fraction ratios were related to horizon types as used in the Canadian System of Soil Classification, and were effective in discriminating between certain horizon types, particularly between Luvisolic Bt and Podzolic Bf. The results also suggested that humus fraction ratios may be effective in separating distinct sub-populations within Ah horizons and Bf horizons in general, based on qualitative differences in organic matter present. Aspects of the role of humus fractions in soil genesis are discussed.

Role of humic acid on oral drug delivery of an antiepileptic drug

2010 ◽  
Vol 37 (3) ◽  
pp. 310-319 ◽  
Author(s):  
Mohd. Aamir Mirza ◽  
Suraj Prakash Agarwal ◽  
Md. Akhlaquer Rahman ◽  
Abdur Rauf ◽  
Niyaz Ahmad ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Humic Acid ◽  
Antiepileptic Drug ◽  
Oral Drug Delivery ◽  
Oral Drug

scholarly journals Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

2012 ◽  
Vol 14 (4) ◽  
pp. 95-99 ◽  
Author(s):  
Justyna Karolczyk ◽  
Sylwia Mozia ◽  
Antoni W. Morawski ◽  
Jacek Przepiórski
Keyword(s):  
Humic Acid ◽  
Water Adsorption ◽  
Ethylene Terephthalate ◽  
Porous Carbons ◽  
Preparation Conditions ◽  
Poly Ethylene Terephthalate ◽  
Magnesium Compounds ◽  
Textural Parameters ◽  
Poly Ethylene

Abstract Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.

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