Document Detail

Characterizing the release of different composition of dissolved organic matter in soil under acid rain leaching using three-dimensional excitation-emission matrix spectroscopy.
MedLine Citation:
PMID:  19577791     Owner:  NLM     Status:  MEDLINE    
Although excitation-emission matrix spectroscopy (EEMS) has been widely used to characterize dissolved organic matter (DOM), there has no report that EEMS has been used to study the effects of acid rain on DOM and its composition in soil. In this work, we employed three-dimensional EEMS to characterize the compositions of DOM leached by simulated acid rain from red soil. The red soil was subjected to leaching of simulated acid rain of different acidity, and the leached DOM presented five main peaks in its EEMS: peak-A, related to humic acid-like (HA-like) material, at Ex/Em of 310-330/395-420nm; peak-B, related to UV fulvic acid-like (FA-like) material, at Ex/Em of 230-280/400-435nm; peak-C and peak-D, both related to microbial byproduct-like material, at Ex/Em of 250-280/335-355nm and 260-280/290-320nm, respectively; and peak-E, related to simple aromatic proteins, at Ex/Em of 210-240/290-340nm. EEMS analysis results indicated that most DOM could be lost from red soil in the early phase of acid rain leaching. In addition to the effects of the pH of acid rain, the loss of DOM also depended on the properties of its compositions and the solubility of their complexes with aluminum. HA-like and microbial byproduct-like materials could be more easily released from red soil by acid rain at both higher pH (4.5 and 5.6) and lower pH (2.5 and 3) than that at middle pH (3.5). On the contrary, FA-like material lost in a similar manner under the action of different acid rains with pH ranging from 2.5 to 5.6.
Li Liu; Cunyi Song; Zengguang Yan; Fasheng Li
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-04
Journal Detail:
Title:  Chemosphere     Volume:  77     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-02     Completed Date:  2009-11-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  15-21     Citation Subset:  IM    
Department of Soil Pollution Control, Chinese Research Academy of Environmental Sciences, Beijing, PR China.
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MeSH Terms
Hydrogen-Ion Concentration
Organic Chemicals / chemistry*
Rain / chemistry*
Soil / analysis*
Spectrometry, Fluorescence
Reg. No./Substance:
0/Organic Chemicals; 0/Soil

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