Determination of humic substances in sediments by focused ultrasound extraction and ultraviolet visible spectroscopy

2016 ◽  
Vol 128 ◽  
pp. 26-33 ◽  
Author(s):  
Juan C. Raposo ◽  
Unai Villanueva ◽  
Maitane Olivares ◽  
Juan M. Madariaga
Keyword(s):  
Humic Substances ◽  
Focused Ultrasound ◽  
Visible Spectroscopy ◽  
Ultrasound Extraction

scholarly journals Determination of Organic Compounds, Fulvic Acid, Humic Acid, and Humin in Peat and Sapropel Alkaline Extracts

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2995
Author(s):  
Laurynas Jarukas ◽  
Liudas Ivanauskas ◽  
Giedre Kasparaviciene ◽  
Juste Baranauskaite ◽  
Mindaugas Marksa ◽  
...  
Keyword(s):  
Humic Acid ◽  
Fulvic Acid ◽  
Humic Substances ◽  
Organic Compounds ◽  
Chemical Constituents ◽  
Acid Amide ◽  
Extraction Methods ◽  
Ultrasound Extraction ◽  
Different Origins

Black, brown, and light peat and sapropel were analyzed as natural sources of organic and humic substances. These specific substances are applicable in industry, agriculture, the environment, and biomedicine with well-known and novel approaches. Analysis of the organic compounds fulvic acid, humic acid, and humin in different peat and sapropel extracts from Lithuania was performed in this study. The dominant organic compound was bis(tert-butyldimethylsilyl) carbonate, which varied from 6.90% to 25.68% in peat extracts. The highest mass fraction of malonic acid amide was in the sapropel extract; it varied from 12.44% to 26.84%. Significant amounts of acetohydroxamic, lactic, and glycolic acid derivatives were identified in peat and sapropel extracts. Comparing the two extraction methods, it was concluded that active maceration was more efficient than ultrasound extraction in yielding higher amounts of organic compounds. The highest amounts of fulvic acid (1%) and humic acid and humin (15.3%) were determined in pure brown peat samples. This research on humic substances is useful to characterize the peat of different origins, to develop possible aspects of standardization, and to describe potential of the chemical constituents.

On the potentiality of using the fluorescence of humic substances for the determination of hydrological structures in coastal sea waters and in inland water basins

Oceanology ◽  
2012 ◽  
Vol 52 (4) ◽  
pp. 566-575 ◽  
Author(s):  
V. V. Fadeev ◽  
N. N. Sysoev ◽  
I. V. Fadeeva ◽  
S. A. Dolenko ◽  
T. A. Dolenko
Keyword(s):  
Humic Substances ◽  
Inland Water ◽  
Coastal Sea

Chemiluminescent determination of humic substances based on the oxidation by peroxymonosulfate

2005 ◽  
Vol 552 (1-2) ◽  
pp. 141-146 ◽  
Author(s):  
Giselle Baratti Magdaleno ◽  
Nina Coichev
Keyword(s):  
Humic Substances

The influence of agitation on aggregates formed during treatment of water with a content of humic substances

2006 ◽  
Vol 6 (1) ◽  
pp. 211-218 ◽  
Author(s):  
L. Pivokonska ◽  
M. Pivokonsky
Keyword(s):  
Humic Substances ◽  
Velocity Gradient ◽  
Laboratory Tests ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Aluminium Chloride ◽  
Velocity Gradients ◽  
Perforated Baffle ◽  
Wide Size Distribution

This study aims to evaluate the influence of agitation conditions on the efficiency of the aggregation process when treating surface water containing humic substances. Laboratory tests were conducted by the jar tests using a variable speed paddle gang stirrer. Optimization of agitation intensity was determined by a Couette flocculator. Suspension was prepared using aluminium chloride as a destabilising reagent. Aggregation efficiency was evaluated by the determination of the degree of aggregation and by the test of aggregation. For all surface waters treated, the optimum treatability was demonstrated by applying higher velocity gradients (G=200–250 s−1). In addition to the laboratory tests, the plant measurements with water containing increased amounts of humic substances were taken to evaluate the aggregation efficiency. The results obtained by the aggregation efficiency measurements show that the intensity of agitation, with the assistance of perforated baffle-type flocculation chamber, attains a low level of velocity gradient (G=22–113 s−1), in contrast to the optimized velocity gradient level (G=200–250 s−1). The aggregates formed in the water treatment plant have an unsuitably wide size-distribution.

Determination of molecular weights of humic substances by analytical (UV scanning) ultracentrifugation

1990 ◽  
Vol 54 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Patrick M. Reid ◽  
Alan E. Wilkinson ◽  
Edward Tipping ◽  
Malcolm N. Jones
Keyword(s):  
Humic Substances ◽  
Molecular Weights
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