Effects of different molecular weight fractions of dissolved organic matter on the growth of bacteria, algae and protozoa from a highly humic lake

Hydrobiologia ◽  
1992 ◽  
Vol 229 (1) ◽  
pp. 239-252 ◽  
Author(s):  
T. Tulonen ◽  
K. Salonen ◽  
L. Arvola
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Humic Lake ◽  
Molecular Weight Fractions ◽  
Growth Of Bacteria ◽  
Different Molecular Weight

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

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

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

Degradation of natural and Kraft lignins by the microflora of soil and water

1977 ◽  
Vol 23 (4) ◽  
pp. 434-440 ◽  
Author(s):  
Don L. Crawford ◽  
Suellen Floyd ◽  
Anthony L. Pometto III ◽  
Ronald L. Crawford
Keyword(s):  
Molecular Weight ◽  
Microbial Degradation ◽  
Lignin Degradation ◽  
Kraft Lignin ◽  
Lignin Biodegradation ◽  
Incubation Periods ◽  
Molecular Weight Fractions ◽  
Soil And Water ◽  
Different Molecular Weight ◽  
Microbial Attack

The comparative rates of microbial degradation 14C-lignin-labeled lignocelluloses and 14C-Kraft lignins were investigated using selected soil and water samples as sources of microorganisms. Natural lignocelluloses containing 14C primarily in their lignin components were prepared by feeding plants uniformly labeled L-[14C]phenylalanine through their cut stems. 14C-Kraft lignins were prepared by pulping lignin-labeled lignocelluloses. Rates of lignin biodegradation were determined by monitoring 14CO2 evolution from incubation mixtures over incubation periods of up to 1000 h. Observed rates of lignin degradation were slow in all cases. Kraft lignins appeared more resistant to microbial attack than natural lignins, even though they were decomposed more rapidly during the first 100–200 h of incubation. Similar degradation patterns were observed in both soil and water. Individual samples, however, varied greatly in their overall rates of degradation of either lignin type. A Kraft-lignin preparation was separated into a variety of molecular weight fractions by column chromatography on LH-20 Sephadex and the biodegradability of the different molecular weight fractions determined. The lower molecular weight fractions of the Kraft lignin were decomposed at a significantly faster rate by the microflora of soil than were the fractions of higher molecular weight.

Complexation of arsenate to humic acid with different molecular weight fractions in aqueous solution

2021 ◽  
pp. 1-7
Author(s):  
Shifeng Li ◽  
Feng Lu ◽  
Hongtao Lv ◽  
Yang Zhou ◽  
Mario A. Gomez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Humic Acid ◽  
Molecular Weight Fractions ◽  
Different Molecular Weight
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