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

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

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>

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