You need JavaScript to view this

Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama

Abstract

Humic acids samples (one deriving from a sedimentary soil and other from a peat), in aqueous media, were irradiated with gamma rays, in doses of 10, 50 and 100 kGy, in order to understand their chemical behavior after the irradiation. The material, before and after irradiation, was analyzed by Elemental Analysis, Functional Groups (carboxylic acids and phenols), UV/Vis Spectroscopy (E{sub 4}/E{sub 6} ratio), IR spectroscopy, CO{sub 2} content and Gel permeation Chromatography (GPC) ). The Elemental Analysis showed the humic acid derived from a peat had a most percentage quantity of Carbon and Hydrogen than the material from a sedimentary soil. From the UV/Vis Spectroscopy, it was observed a decrease of E{sub 4}/E{sub 6} ratio with an increase of the applied dose. The data from GPC are in agreement with this. The results showed that the molecular weight of the material increased by exposing it to a larger radiolitical dose. The peat material was less affected by the gamma radiation than the soil material. The carboxylic groups were responsible by radiochemical behavior of the material. (author)
Publication Date:
Jul 01, 1995
Product Type:
Thesis/Dissertation
Report Number:
INIS-BR-3755
Reference Number:
EDB-00:107208
Resource Relation:
Other Information: TH: Tese (M.Sc.); 53 refs., 17 figs., 11 tabs; PBD: 1995
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; ABSORPTION SPECTRA; DOSE RATES; EXPERIMENTAL DATA; GAMMA RADIATION; GEL PERMEATION CHROMATOGRAPHY; HUMIC ACIDS; PEAT; RADIOLYSIS; SOILS; STABILITY; STRUCTURAL CHEMICAL ANALYSIS
OSTI ID:
20047994
Research Organizations:
Sao Paulo Univ., Sao Carlos, SP (Brazil). Inst. de Quimica
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR0039979011546
Availability:
Available from INIS in electronic form
Submitting Site:
BRN
Size:
65 pages
Announcement Date:

Citation Formats

Silva, Wilson Tadeu Lopes da. Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama. Brazil: N. p., 1995. Web.
Silva, Wilson Tadeu Lopes da. Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama. Brazil.
Silva, Wilson Tadeu Lopes da. 1995. "Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama." Brazil.
@misc{etde_20047994,
title = {Study of stability of humic acids from soil and peat irradiated by gamma rays; Estudo da estabilidade de acidos humicos extraidos de solo e turfa, frente a radiacao ionizante gama}
author = {Silva, Wilson Tadeu Lopes da}
abstractNote = {Humic acids samples (one deriving from a sedimentary soil and other from a peat), in aqueous media, were irradiated with gamma rays, in doses of 10, 50 and 100 kGy, in order to understand their chemical behavior after the irradiation. The material, before and after irradiation, was analyzed by Elemental Analysis, Functional Groups (carboxylic acids and phenols), UV/Vis Spectroscopy (E{sub 4}/E{sub 6} ratio), IR spectroscopy, CO{sub 2} content and Gel permeation Chromatography (GPC) ). The Elemental Analysis showed the humic acid derived from a peat had a most percentage quantity of Carbon and Hydrogen than the material from a sedimentary soil. From the UV/Vis Spectroscopy, it was observed a decrease of E{sub 4}/E{sub 6} ratio with an increase of the applied dose. The data from GPC are in agreement with this. The results showed that the molecular weight of the material increased by exposing it to a larger radiolitical dose. The peat material was less affected by the gamma radiation than the soil material. The carboxylic groups were responsible by radiochemical behavior of the material. (author)}
place = {Brazil}
year = {1995}
month = {Jul}
}