Impact of drying/rewetting cycles on the bioavailability of dissolved organic matter molecular-weight fractions in a Mediterranean stream

2015 ◽  
Vol 34 (1) ◽  
pp. 263-275 ◽  
Author(s):  
E. Vázquez ◽  
E. Ejarque ◽  
I. Ylla ◽  
A. M. Romaní ◽  
A. Butturini
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Mediterranean Stream ◽  
Molecular Weight Fractions

Spectral and mass spectrometric characteristics of different molecular weight fractions of dissolved organic matter

2020 ◽  
Vol 253 ◽  
pp. 117390 ◽  
Author(s):  
Xiaoxiao Zhang ◽  
Jing Kang ◽  
Wei Chu ◽  
Shengxin Zhao ◽  
Jimin Shen ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Mass Spectrometric ◽  
Molecular Weight Fractions ◽  
Different Molecular Weight

Effects of dissolved organic matter on sorption of benzotriazole to soil

2020 ◽  
Author(s):  
Lin Wu ◽  
Jin’e Dai ◽  
Erping Bi
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Organic Contaminants ◽  
Low Molecular Weight ◽  
Sorption Equilibrium ◽  
Solution Ph ◽  
Environmental Behaviors ◽  
Unsaturated Zones ◽  
Molecular Weight Fractions

<p>Dissolved organic matter (DOM) plays an important role in affecting the environmental behaviors of organic contaminants. Effects of two representative DOMs (dissolved humic acid (HA) and tannic acid (TA)) on sorption of benzotriazole (BTA) to a reference soil were investigated by batch experiments. The results indicated that TA had stronger sorption to soil than HA (initial solution pH=6.0±0.1). This is because that TA contains more carboxylic and phenolic groups than those of HA. In the solution with DOM, the enhanced sorption of BTA was caused by cumulative sorption resulting from sorbed DOM. Hydrogen bonding was proposed as the main binding mechanism between BTA and the sorbed DOM. When the solution pH at sorption equilibrium increased from 6.5 to 10.5, the electrostatic repulsion inhibited the sorption of BTA in solution with/without HA. In addition, less hydrogren bonds made the effect of HA in promoting BTA sorption decrease when solution pH changed from 6.5 to 10.5. Higher molecular weight fractions of HA could be preferentially sorbed by the soil, its enhancement on BTA sorption was more obvious than that of the low molecular weight fractions. These findings are conducive to a better understanding of environmental behaviors of BTA as well as other organic compounds with similar structure in the unsaturated zones.</p>

Fluorescence characteristics of molecular weight fractions of dissolved organic matter derived from composts

2016 ◽  
Vol 113 ◽  
pp. 187-194 ◽  
Author(s):  
Zimin Wei ◽  
Xueqin Wang ◽  
Xinyu Zhao ◽  
Beidou Xi ◽  
Yuquan Wei ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Fluorescence Characteristics ◽  
Molecular Weight Fractions

Molecular Weight of Dissolved Organic Matter–Napropamide Complex Transported through Soil Columns

2002 ◽  
Vol 31 (2) ◽  
pp. 619 ◽  
Author(s):  
C. F. Williams ◽  
J. Letey ◽  
W. J. Farmer
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Soil Columns

Photoformation of Low-Molecular-Weight Organic Acids from Brown Water Dissolved Organic Matter

2003 ◽  
Vol 37 (18) ◽  
pp. 4190-4198 ◽  
Author(s):  
Thomas Brinkmann ◽  
Philip Hörsch ◽  
Daniel Sartorius ◽  
Fritz H. Frimmel
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Organic Acids ◽  
Low Molecular Weight

scholarly journals High molecular weight dissolved organic matter enrichment selects for methylotrophs in dilution to extinction cultures

2015 ◽  
Vol 9 (12) ◽  
pp. 2725-2739 ◽  
Author(s):  
Oscar A Sosa ◽  
Scott M Gifford ◽  
Daniel J Repeta ◽  
Edward F DeLong
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Molecular Weight

scholarly journals Cycling of high-molecular-weight dissolved organic matter in the Middle Atlantic Bight as revealed by carbon isotopic (13 C and 14 C) signatures

1996 ◽  
Vol 41 (6) ◽  
pp. 1242-1252 ◽  
Author(s):  
Laodong Guo ◽  
Peter H. Santschi ◽  
Luis A. Cifuentes ◽  
Susan E. Trumbore ◽  
John Southon
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Molecular Weight ◽  
Middle Atlantic Bight ◽  
Middle Atlantic ◽  
Carbon Isotopic

Rapid cycling of high-molecular-weight dissolved organic matter in the ocean

Nature ◽  
1994 ◽  
Vol 369 (6481) ◽  
pp. 549-552 ◽  
Author(s):  
Rainer M. W. Amon ◽  
Ronald Benner
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
High Molecular Weight ◽  
Rapid Cycling
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