Forensic Techniques for Establishing the Origin and Timing of a Contaminant Release

2020 ◽  
pp. 145-172
Author(s):  
Robert D. Morrison
Keyword(s):  
Contaminant Release

COMPARISON OF COLUMN LEACHING RATES ON CONTAMINANT RELEASE FROM RIVER FLOODPLAIN SEDIMENTS AT A FORMER URANIUM MILL SITE

2019 ◽  
Author(s):  
Aaron D. Tigar ◽  
◽  
Raymond H. Johnson ◽  
Michael S. Bradley ◽  
Kara Tafoya
Keyword(s):  
Column Leaching ◽  
River Floodplain ◽  
Floodplain Sediments ◽  
Contaminant Release

Three-Dimensional Concentration and Velocity Measurements of a Pulsatile Contaminant Release in a Model of Oklahoma City

2021 ◽  
Author(s):  
Daniel Chung ◽  
Lynne Mooradian ◽  
Joshua Rhee ◽  
Michael Benson ◽  
Christopher J. Elkins ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Oklahoma City ◽  
Velocity Measurements ◽  
Contaminant Release

scholarly journals Sediment rarefaction resuspension and contaminant release under tidal currents

2014 ◽  
Vol 26 (5) ◽  
pp. 827-834 ◽  
Author(s):  
Peng-da Cheng ◽  
Hong-wei Zhu ◽  
Bao-chang Zhong ◽  
Dao-zeng Wang
Keyword(s):  
Tidal Currents ◽  
Contaminant Release

scholarly journals Efficient gHMC Reconstruction of Contaminant Release History

2019 ◽  
Vol 7 ◽  
Author(s):  
David A. Barajas-Solano ◽  
Francis J. Alexander ◽  
Marian Anghel ◽  
Daniel M. Tartakovsky
Keyword(s):  
Contaminant Release

Contaminant release from aged microplastic

2017 ◽  
Vol 14 (6) ◽  
pp. 394 ◽  
Author(s):  
Nicole Bandow ◽  
Verena Will ◽  
Volker Wachtendorf ◽  
Franz-Georg Simon
Keyword(s):  
Material Properties ◽  
High Density Polyethylene ◽  
Aging Process ◽  
Artificial Aging ◽  
Degradation Products ◽  
Total Content ◽  
Oxidation Reactions ◽  
Inorganic Species ◽  
Aging Conditions ◽  
Contaminant Release

Environmental contextIncreasing global plastic production adds plastic debris to the environment. We show that potentially harmful additives present in plastic particles are released to water at an increased rate when material properties change by aging due to exposure to high temperature and especially to UV radiation. For risk assessment of such plastic additives, more information on their degradation products and their toxicity is needed. AbstractRecycled plastic granules of high-density polyethylene, polyvinyl chloride and polystyrene the size of microplastics were exposed to artificial aging conditions (2000h; photooxidative and thermo-oxidative) to simulate their fate outdoors. Their potential to leach into water during the aging process was investigated using column percolation tests. Aging-related changes on the surface of the material were characterised by IR measurements indicating oxidation reactions with the formation of new adsorption bands (C=O, C–O and OH), especially in the case of photooxidative aging. These findings were confirmed by the identification of leachable organic compounds. Leaching of total organic carbon, Cl, Ca, Cu and Zn is clearly affected by changes due to aging, and their release is increased after photooxidative aging. In general, exposure to photooxidative conditions shows a greater influence on aging and thus on leaching and seems to be the more important mechanism for the aging of microplastic in the environment. Comparison with the total content of inorganic species revealed that, for most elements, less than 3% of the total content is released after 2000h of photooxidative aging.

Sign in / Sign up

Export Citation Format

Share Document