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Luminescence from {gamma}-irradiated humic acid

Abstract

This study was conducted to investigate the ultraweak delayed radiochemiluminescence (RCL) spectra, kinetics and spectroscopic properties of humic acids (HAs) after {gamma}-radiation exposure (absorbed doses of 1-10 kGy, Co-60) in model systems. The kinetics and spectral distribution of RCL (340-650 nm) were measured using the single photon counting (SPC) method and cut-off filters. The intensity of fluorescence ({lambda}{sub ex}=390, 440, 490 and 540 nm) covering the spectral range 400-580 nm was heavily dependent on the {lambda}{sub ex} and slightly increased with the absorbed dose of {gamma}-radiation. Absorption spectra (the range 240-800 nm) and color coefficients E{sub 2.6/4} and E{sub 4/6} of irradiated solutions indicated that post-radiative degradation/polymerization processes take place in the HA, changing their macromolecule size or properties. Comparison of FTIR spectra and elemental analysis proved an increased O and decreased C atoms in irradiated samples. The data indicate on the radiolysis-induced degradation of native HA into fulvic-like acids with higher hydrophilicity and lower molecular size.
Authors:
Goraczko, Wieslaw; [1]  Slawinski, Janusz [2] 
  1. Faculty of Chemical Technology, Radio- and Photochemistry Department, Poznan University of Technology, ul. Piotrowo 3, 60-965 Poznan (Poland)
  2. Institute of Ecotechnology, State Higher Vocational School, ul. Ks. Kard. S.Wyszynskiego 38, 62-200 Gniezno (Poland)
Publication Date:
Jul 15, 2008
Product Type:
Journal Article
Resource Relation:
Journal Name: Journal of Luminescence; Journal Volume: 128; Journal Issue: 7; Other Information: DOI: 10.1016/j.jlumin.2007.11.084; PII: S0022-2313(07)00427-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; CHEMILUMINESCENCE; FLUORESCENCE; GAMMA RADIATION; HUMIC ACIDS; INFRARED SPECTRA; IRRADIATION; KINETICS; POLYMERIZATION; RADIATION DOSES; RADIOLYSIS
OSTI ID:
21136427
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0022-2313; JLUMA8; TRN: NL08S3188017081
Availability:
Available from http://dx.doi.org/10.1016/j.jlumin.2007.11.084;INIS
Submitting Site:
NLN
Size:
page(s) 1155-1161
Announcement Date:
Mar 20, 2009

Citation Formats

Goraczko, Wieslaw, and Slawinski, Janusz. Luminescence from {gamma}-irradiated humic acid. Netherlands: N. p., 2008. Web. doi:10.1016/j.jlumin.2007.11.084.
Goraczko, Wieslaw, & Slawinski, Janusz. Luminescence from {gamma}-irradiated humic acid. Netherlands. doi:10.1016/j.jlumin.2007.11.084.
Goraczko, Wieslaw, and Slawinski, Janusz. 2008. "Luminescence from {gamma}-irradiated humic acid." Netherlands. doi:10.1016/j.jlumin.2007.11.084. https://www.osti.gov/servlets/purl/10.1016/j.jlumin.2007.11.084.
@misc{etde_21136427,
title = {Luminescence from {gamma}-irradiated humic acid}
author = {Goraczko, Wieslaw, and Slawinski, Janusz}
abstractNote = {This study was conducted to investigate the ultraweak delayed radiochemiluminescence (RCL) spectra, kinetics and spectroscopic properties of humic acids (HAs) after {gamma}-radiation exposure (absorbed doses of 1-10 kGy, Co-60) in model systems. The kinetics and spectral distribution of RCL (340-650 nm) were measured using the single photon counting (SPC) method and cut-off filters. The intensity of fluorescence ({lambda}{sub ex}=390, 440, 490 and 540 nm) covering the spectral range 400-580 nm was heavily dependent on the {lambda}{sub ex} and slightly increased with the absorbed dose of {gamma}-radiation. Absorption spectra (the range 240-800 nm) and color coefficients E{sub 2.6/4} and E{sub 4/6} of irradiated solutions indicated that post-radiative degradation/polymerization processes take place in the HA, changing their macromolecule size or properties. Comparison of FTIR spectra and elemental analysis proved an increased O and decreased C atoms in irradiated samples. The data indicate on the radiolysis-induced degradation of native HA into fulvic-like acids with higher hydrophilicity and lower molecular size.}
doi = {10.1016/j.jlumin.2007.11.084}
journal = {Journal of Luminescence}
issue = {7}
volume = {128}
place = {Netherlands}
year = {2008}
month = {Jul}
}