Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substances: The Effect of Dissolved Oxygen on Quenching Processes

1995 ◽  
Vol 29 (8) ◽  
pp. 2162-2165 ◽  
Author(s):  
Karlin M. Danielsen ◽  
Yu-Ping. Chin ◽  
Jeffrey S. Buterbaugh ◽  
Terry L. Gustafson ◽  
Samuel J. Traina
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Humic Substances ◽  
Solubility Enhancement

Response to Comment on “Solubility Enhancement and Fluorescence Quenching of Pyrene by Humic Substance:  The Effects of Dissolved Oxygen on Quenching Processes”

1996 ◽  
Vol 30 (4) ◽  
pp. 1409-1410 ◽  
Author(s):  
Yu-Ping Chin ◽  
Jeffrey M. Buterbaugh ◽  
Terry J. Gustafson ◽  
Samuel J. Traina ◽  
Karlin M. Danielsen
Keyword(s):  
Fluorescence Quenching ◽  
Dissolved Oxygen ◽  
Humic Substance ◽  
Solubility Enhancement

scholarly journals Oxygen uptake during mineralization of humic substances from Infernão Lagoon (São Paulo, Brazil)

2004 ◽  
Vol 64 (3b) ◽  
pp. 583-590 ◽  
Author(s):  
M. B. Cunha-Santino ◽  
I. Bianchini JR.
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Oxygen Uptake ◽  
Dissolved Oxygen ◽  
Humic Substances ◽  
Aquatic Macrophyte ◽  
Uptake Coefficient ◽  
First Order ◽  
First Order Kinetics ◽  
Different Sources

Assays were carried out to evaluate the dissolved oxygen uptake resulting from mineralization of humic substances (fulvic acid (FA) and humic acid (HA)) from different sources: sediment, dissolved organic matter (DOM) of 120-day decomposed aquatic macrophyte (Scirpus cubensis and Cabomba piauhyensis), and lagoon DOM. The experiments were also aimed at estimating the oxygen uptake coefficient of the mineralization. About 20-30 mg of substrate were added to 1.1 liters of water from Infernão Lagoon (21º33' to 21º37'S; 47º45' to 47º51'W). The solutions were aerated and the dissolved oxygen (DO) was monitored during 40 days. Dissolved organic carbon (DOC) and particulate organic carbon (POC) were estimated after 80 days of the experiment. Anaerobic processes were avoided by aerating the solutions. The results were fitted to a first-order kinetics model, from which the uptake of oxygen parameters was obtained. Oxygen consumption (OC) ranged from 4.24 mg L-1 (HA - S. cubensis) to 33.76 mg L-1 (FA - sediment). The highest deoxygenation coefficient (kD) was observed during mineralization of FA - DOM (0.299 day-1), followed in decreasing order by FA - S. cubensis, HA - sediment, HA - S. cubensis, FA - sediment, and FA - C. piauhyensis (0.282; 0.255; 0.178; 0.130, and 0.123 day-1, respectively). The carbon analyses indicated that the FA and HA samples at the end of the experiment presented a decay that varied from 15.23% to 42.35% and that the FA and HA conversions into POC were relatively low (from 0.76% to 3.94%).

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