Aggregation and Dissolution of Silver Nanoparticles in Natural Surface Water

2012 ◽  
Vol 46 (10) ◽  
pp. 5378-5386 ◽  
Author(s):  
Xuan Li ◽  
John J. Lenhart
Keyword(s):  
Silver Nanoparticles ◽  
Surface Water ◽  
Natural Surface

scholarly journals Removal of Stabilized Silver Nanoparticles from Surface Water by Conventional Treatment Processes

2019 ◽  
Vol 08 (02) ◽  
pp. 21-35 ◽  
Author(s):  
Hafiz H. M. Salih ◽  
Amro M. El Badawy ◽  
Thabet M. Tolaymat ◽  
Craig L. Patterson
Keyword(s):  
Silver Nanoparticles ◽  
Surface Water ◽  
Conventional Treatment ◽  
Treatment Processes

Lake Acidification as a Limiting Factor in the Distribution of the Freshwater Amphipod Hyalella azteca

1986 ◽  
Vol 43 (2) ◽  
pp. 288-292 ◽  
Author(s):  
M. Stephenson ◽  
G. L. Mackie
Keyword(s):  
Surface Water ◽  
Hyalella Azteca ◽  
Lake Acidification ◽  
Limiting Factor ◽  
Short Term ◽  
Natural Surface ◽  
Bioassay Data ◽  
Plastic Lake

The distribution of the freshwater amphipod Hyalella azteca in 79 Ontario lakes suggests that its absence may be a good indicator of lake acidification. Hyalella azteca was present in 69 of 71 nonacidified lakes, and absent in 8 of 8 lakes which either are now ar recently were considered acidified. Bioassay data indicate a 96-h LC50 of pH 4.4 and a 10-d threshold LC50 of pH 4.5 for H. azteca in a natural surface water. Hyalella azteca is extremely rare in Plastic Lake, which undergoes severe short-term acidification in spring, and recruitment is delayed 2 wk in Heeney Lake which undergoes similar short-term acidification, in Dickie, Harp, Red Chalk, and Blue Chalk lakes, where springtime pH depressions below pH 4.7 were not recorded, H. azteca is abundant.

Multi-day diurnal measurements of Ti-containing nanoparticle and organic sunscreen chemical release during recreational use of a natural surface water

2017 ◽  
Vol 4 (1) ◽  
pp. 69-77 ◽  
Author(s):  
R. B. Reed ◽  
D. P. Martin ◽  
A. J. Bednar ◽  
M. D. Montaño ◽  
P. Westerhoff ◽  
...  
Keyword(s):  
Surface Water ◽  
Water System ◽  
Recreational Water ◽  
Chemical Release ◽  
Natural Surface ◽  
First Time ◽  
Recreational Use

A recreational water system was monitored for release of both mineral and organic sunscreen constituents for the first time.

Gas-chromatographic determination of aliphatic amines in natural surface water and wastewater

2008 ◽  
Vol 63 (7) ◽  
pp. 664-667 ◽  
Author(s):  
N. V. Kuz’mina ◽  
F. F. Khizbullin ◽  
T. Ya. Gadomskii ◽  
V. N. Maistrenko
Keyword(s):  
Surface Water ◽  
Chromatographic Determination ◽  
Aliphatic Amines ◽  
Natural Surface ◽  
Water And Wastewater

scholarly journals Degradation of estriol (E3) and transformation pathways after applying photochemical removal processes in natural surface water

2020 ◽  
Vol 82 (7) ◽  
pp. 1445-1453
Author(s):  
T. Perondi ◽  
W. Michelon ◽  
A. Basso ◽  
J. K. Bohrer ◽  
A. Viancelli ◽  
...  
Keyword(s):  
Surface Water ◽  
Degradation Kinetics ◽  
Kinetic Constant ◽  
Aquatic Organisms ◽  
First Order Kinetics ◽  
Natural Surface ◽  
Steroidal Hormones ◽  
Transformation Pathways ◽  
Mechanism Of Degradation ◽  
Oxidative Processes

Abstract Steroidal hormones such as estriol (E3), are resistant to biodegradation; hence their removal by conventional treatment systems (aerobic and anaerobic) facilities is limited. These substances are detected in surface water, and present risks to the aquatic ecosystem and humans via potential biological activity. Photochemical treatments can be used to remove E3; however, just a few studies have analyzed the kinetics, intermediates, and E3 degradation pathways in natural surface water. In this study, the behavior of E3 under ultraviolet irradiation associated with H2O2, O3 or TiO2 was investigated to determine the degradation potential and the transformation pathways in reactions performed with a natural surface water sample. E3 degradation kinetics (200 ppb) fitted well to the pseudo-first-order kinetics model, with kinetic constant k in the following order: kUV/O3 > kUV/TiO2 > kUV/H2O2 > kUV. The mechanism of degradation using different advanced oxidative processes seemed to be similar and 12 transformation byproducts were identified, with 11 of them being reported here for the first time. The byproducts could be formed by the opening of the aromatic ring and addition of a hydroxyl radical. A possible route of E3 degradation was proposed based on the byproducts identified, and some of the byproducts presented chronic toxicity to aquatic organisms, demonstrating the risks of exposure.

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