scholarly journals PREPARATION CONDITIONS OF HUMIC ACIDS FROM VILLAGE'S COMPOST FUEL (VCF) AND THEIR EFFECTS ON HUMIC ACIDS CHEMICAL CHARACTERISTIC ALTERNATION DURING ISOLATION PART II. EFFECT OF THE EXTRACTION CONDITIONS ON THE FUNCTIONAL GROUPS CONTENTS OF HUMIC ACIDS AS REVEALED BY SPECTROSCOPIC ANALYSIS

2007 ◽  
Vol 18 (Issue 1-A) ◽  
pp. 87-101
Author(s):  
M. BADR
Keyword(s):  
Functional Groups ◽  
Humic Acids ◽  
Spectroscopic Analysis ◽  
Chemical Characteristic ◽  
Preparation Conditions

scholarly journals Synthesis, stability, and reactivity of mesoionic carbene iridium dihydride complexes

2020 ◽  
Author(s):  
Marta Olivares ◽  
Martin Albrecht
Keyword(s):  
Electronic Properties ◽  
Functional Groups ◽  
Pyridine Ring ◽  
Spectroscopic Analysis ◽  
Pka Values ◽  
Trans Effect ◽  
Structural Assignment ◽  
Wide Range ◽  
Hydride Metal ◽  
The Stability

Pyridyl-triazolylidene ligands with variable donor properties were used as tunable ligands at a dihydride iridium(III) center. The straightforward synthesis of this type of ligand allows for an easy incorporation of electron donating substituents in different positions of the pyridine ring or different functional groups such as esters, alkoxy or aliphatic chains on the C4 position of the triazole heterocycle. The stability of these hydride metal systems allowed these complexes to be used as models for studying the influence of the ligand modifications on hydride reactivity. Spectroscopic analysis provided unambiguous structural assignment of the dihydride system. Modulation of the electronic properties of the wingtip substituents did not appreciably alter the reactivity of the hydrides. Reactivity studies using acids with a wide range of pKa values indicated a correlation between hydride reactivity and acidity and showed exclusive reactivity towards the less shielded hydride trans to the carbene carbon rather than the more shielded hydride trans to the pyridine ring, suggesting that the trans effect is more relevant in these reactions than the NMR spectroscopically deduced hydridic character.

scholarly journals 3D-fluorescence spectroscopic analysis of HPLC fractionated estuarine fulvic and humic acids

2006 ◽  
Vol 17 (1) ◽  
pp. 113-124 ◽  
Author(s):  
Marta M. D. Sierra ◽  
Marcelo Giovanela ◽  
Edith Parlanti ◽  
Eduardo J. Soriano-Sierra
Keyword(s):  
Humic Acids ◽  
Spectroscopic Analysis

scholarly journals Studies on Contributions of FTIR Spectroscopic analysis in the Puriৎication process of Veeram (Hg2Cl2) used in Siddha formulations

2020 ◽  
Vol 11 (SPL4) ◽  
pp. 1251-1259
Author(s):  
Madhavan R ◽  
Muthukumar N J ◽  
Savariraj Sagayam C ◽  
Rajalakshmi P ◽  
Brindha P
Keyword(s):  
Rheumatoid Arthritis ◽  
Ftir Spectroscopy ◽  
Functional Groups ◽  
Spectroscopic Analysis ◽  
Lemon Juice ◽  
Ftir Analysis ◽  
Chemical Formula ◽  
Chemical Changes ◽  
Before And After ◽  
Tender Coconut

In Siddha system Arsenics are called as Paasaanam (toxins). Veeram is one of the paasaanam, its chemical formula is Hg2Cl2 (Calomel). Internally arsenic based medicines are used for rheumatoid arthritis, generalized body pain, syphilis, epilepsy and cancer.Various organic agents are used to purify the veeram such as milk, tender coconut, bitter guard and lemon juice. In this study raw veeram and products obtained after purification were analyzed using FTIR Spectroscopy with a view to understand the need and mechanism of this purification processes. FTIR analysis was carried out before and after purification. Efforts were made to study various chemical changes veeram undergoes during this process. FTIR of the raw Veeram and its processed samples were recorded between 4000-400cm-1. In the study raw drug showed only nine functional groups in the region between 3789.36cm-1 and 468.75cm-1. Bitter gourd treated veeram peaks  were observed in the region between 3526.99 and 476.62cm-1 and a total of 13-peaks were obtained.  Milk treated veeram showed peaks in the region between 3851.10 and 470.39cm-1 and total of 16- peaks were obtained. This method indicated presence of large number of functional groups. Lemon juice treated veeram showed peaks in between 3839.33 and 471.99cm-1  total of 15-peaks were obtained. Tender coconut veeram peaks were observed in between 3877.84 and 477.33cm-1  and total of 15-peaks were obtained. From this data number of functional groups increased in purified samples which indicated that the toxic veeram is not only detoxified but also interacted with functional groups of purifying agents there by therapeutic potency is enhanced.

Functional and Elemental Composition of Humic Acids of Sapropels of the River Ob’s Left Bank of Khmao-Yugra

2019 ◽  
Vol 16 (11) ◽  
pp. 4601-4604
Author(s):  
M. Osnitsky Evgeny ◽  
A. Gurova Olga ◽  
V. Boroduy Davyd ◽  
V. Litvinenko Natalia ◽  
V. Grekhova Iraida
Keyword(s):  
Elemental Composition ◽  
Functional Groups ◽  
Humic Acids ◽  
Chemical Elements ◽  
Left Bank ◽  
Degree Of Aromaticity ◽  
Maximum Proportion ◽  
The Relationship ◽  
Khanty Mansi Autonomous ◽  
Qualitative And Quantitative Characteristics

This article describes qualitative and quantitative characteristics of chemical elements and acidbase functional groups of humic acids (HA) in five lakes of the left bank of the Ob of Khanty-Mansi Autonomous Okrug-Yugra. The data on their elemental composition (CNHO), atomic ratios (H/C, O/C) carboxyl (COOH) and phenolic (OH) functional groups have been presented. The relationship between the elemental and functional composition of HA has been traced. It is found that with increasing hydrogen content, the percentage of carboxyl groups in the macromolecule of HA increases, the proportion of aromatic moieties reduces, and with increasing oxygen content the number of phenolic hydroxyls increases. According to the chart of atomic ratios describing the content of aromatic and aliphatic parts, HA are placed in the sequence, characterizing the maximum proportion of aromatic structures. Clearly there is a group of HA of lake Shchuchye sapropel, which is characterized by a maximum degree of aromaticity, followed by in decreasing order according to the contents of the Carom humic acids of sapropels of lakes Srednesatyginskiy Tuman, Nyartur, Medvezhye and Satyginskiy Tuman. The highest content of the Carom is typical for the more formed, “mature” HA.

A Vibrational Spectroscopic Analysis of the Structure of Natural Rubber

1987 ◽  
Vol 60 (4) ◽  
pp. 647-658 ◽  
Author(s):  
F. J. Lu ◽  
S. L. Hsu
Keyword(s):  
Natural Rubber ◽  
Functional Groups ◽  
Spectroscopic Analysis ◽  
Extraction Solvent ◽  
Gel Fraction ◽  
Gel Phase ◽  
Composition Structure ◽  
Vulcanization Process ◽  
Structural Aspects ◽  
Soluble Part

Abstract It is not an overstatement to say that natural rubber (NR) is one of the most used polymers. There are numerous studies dealing with the structural aspects of rubber which give rise to its elastic property. However, it should be emphasized that the majority of these studies are generally concerned with rubber in the vulcanized state or, in fact, dealing with the vulcanization process. Relatively few studies have actually been directed at a better understanding of the composition, structure, and properties of raw rubber. This area of study is also important because the composition and the structure of NR differ from synthetic polyisoprene in that the presence of functional groups on main chains and nonrubbery materials, such as proteins, can significantly affect the rheological properties and the processing conditions of rubber before the vulcanization process. Raw rubber can be divided into two different fractions, sol (soluble part) and gel (insoluble part). Of course, this definition depends somewhat on the solvent used. Even though the main chain in both portions of rubber are chemically similar, their significantly distinct mechanical properties have, in fact, been attributed to the nonrubbery materials such as proteins interacting with isoprene chains. It is generally accepted that the amount of nonrubbery materials in the gel fraction is much higher than the sol fraction. The protein apparently interacts quite strongly with specific functional groups on the isoprene chain and is difficult to remove from the gel phase by physical means. It is probable that the different properties between sol and gel rubber is due to the amount of crosslinking of the main chains, but several aspects of the structure need to be answered in greater detail. We know, for example, that the amount of gel fraction can change as a function of extraction solvent. Therefore, one cannot conclude that the interaction between rubber chains even in the gel fraction is strictly chemical in nature. Our premise is that the protein is an important component connecting the isoprene chains.

scholarly journals Effect of residual vanadyl ions on the spectroscopic analysis of humic acids: a multivariate approach

2008 ◽  
Vol 59 (3) ◽  
pp. 439-444 ◽  
Author(s):  
E. H. Novotny ◽  
H. Knicker ◽  
L. Martin-Neto ◽  
R. B. V. Azeredo ◽  
M. H. B. Hayes
Keyword(s):  
Humic Acids ◽  
Spectroscopic Analysis ◽  
Multivariate Approach
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