scholarly journals Effect of Cosolutes on the Sorption of Phenanthrene onto Mineral Surface of River Sediments and Kaolinite

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Yinghong Wu ◽  
Fang Liu ◽  
Wen Zhang ◽  
Lei Wang
Keyword(s):  
Organic Contaminants ◽  
Water Distribution ◽  
River Sediments ◽  
Distribution Coefficients ◽  
Organic Carbon Content ◽  
Mineral Surface ◽  
Natural Sediment ◽  
Obvious Effect ◽  
Freundlich Model ◽  
Low Levels

Sorption of phenanthrene onto the natural sediment with low organic carbon content (OC%), organic-free sediment, and kaolinite was investigated through isotherm experiments. Effects of cosolutes (pyrene, 4-n-nonyphenol (NP), and humic acid (HA)) on phenanthrene sorption were also studied by comparing apparent solid-water distribution coefficients (Kdapp) of phenanthrene. Two addition sequences, including “cosolute added prior to phenanthrene” and “cosolute and phenanthrene added simultaneously,” were adopted. The Freundlich model fits phenanthrene sorption on all 3 sorbents well. The sorption coefficients on these sorbents were similar, suggesting that mineral surface plays an important role in the sorption of hydrophobic organic contaminants on low OC% sediments. Cosolutes could affect phenanthrene sorption on the sorbents, which depended on their properties, concentrations, and addition sequences. Pyrene inhibited phenanthrene sorption. Sorbed NP inhibited phenanthrene sorption at low levels and promoted sorption at high levels. Similar to NP, effect of HA on phenanthrene sorption onto the natural sediment depended on its concentrations, whereas, for the organic-free sediment and kaolinite, preloading of HA at high levels led to an enhancement in phenanthreneKdappwhile no obvious effect was observed at low HA levels; dissolved HA could inhibit phenanthrene sorption on the two sorbents.

Predicting cyclohexane/water distribution coefficients for the SAMPL5 challenge using MOSCED and the SMD solvation model

2016 ◽  
Vol 30 (11) ◽  
pp. 1007-1017 ◽  
Author(s):  
Sebastian Diaz-Rodriguez ◽  
Samantha M. Bozada ◽  
Jeremy R. Phifer ◽  
Andrew S. Paluch
Keyword(s):  
Water Distribution ◽  
Distribution Coefficients ◽  
Solvation Model

Mobility of a Polyether Trisiloxane Surfactant in Soil: Soil/Water Distribution Coefficients and Leaching in a Soil Column

2016 ◽  
Vol 227 (2) ◽  
Author(s):  
Amandine Michel ◽  
Conrad Dietschweiler ◽  
Martina Böni ◽  
Michael Burkhardt ◽  
Heinz-Jürgen Brauch ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Distribution ◽  
Soil Column ◽  
Distribution Coefficients ◽  
Soil Water Distribution

Direct analysis of radium-226 in sediment by ICP-MS: an analytical challenge?

2019 ◽  
Vol 34 (8) ◽  
pp. 1597-1605 ◽  
Author(s):  
Hamza Ben Yaala ◽  
Rihab Fniter ◽  
Delphine Foucher ◽  
Olivier Clarisse
Keyword(s):  
Direct Analysis ◽  
Analytical Challenge ◽  
Natural Sediment ◽  
Icp Ms ◽  
Low Levels

Low levels of radium-226 were accurately measured in natural sediment digests using single quadrupole ICP-MS.

Evaluation of the Extent of Contaminated Sediments in the West Branch of the Grand Calumet River, Indiana-Illinois, USA

1993 ◽  
Vol 28 (8-9) ◽  
pp. 53-58 ◽  
Author(s):  
R. A. Cahill ◽  
M. T. Unger
Keyword(s):  
Trace Elements ◽  
Organic Carbon ◽  
Sediment Cores ◽  
River Sediments ◽  
Organic Carbon Content ◽  
Sedimentation Rates ◽  
The West ◽  
Surface Samples ◽  
Rate Information ◽  
The Mean

The extent of contamination in river sediments is often not rigorously evaluated. In many cases, only surface sediment samples are taken. In other cases, entire sediment cores are composited for analysis, an approach that limits the ability to identify discrete zones of contamination. In addition, few studies include information on the rate of sedimentation. Composited sediment cores, subsamples of cores made at discrete intervals, and surface samples were obtained from locations in the West Branch of the Grand Calumet River. The organic carbon content and concentrations of up to 26 major, minor, and trace elements were determined. Sedimentation rates at the ten locations were estimated using 137Cs. The mean concentrations of metals in the surface samples were considerably higher than concentrations in samples obtained by the two coring approaches. Only by analyzing discrete subsamples was it possible to plot the concentrations by depth and location. This approach was used to demonstrate that high levels of organic carbon and trace elements are confined between river miles 5 and 7.5. Sedimentation rate information combined with chemical analyses of the same cores indicate that contamination of this part of the river began in the 1930s.

Toxicity of Oil Sands Plant Wastewaters and Associated Organic Contaminants

1976 ◽  
Vol 11 (1) ◽  
pp. 34-45 ◽  
Author(s):  
S.E. Hrudey ◽  
G.A. Sergy ◽  
T. Thackeray
Keyword(s):  
Rainbow Trout ◽  
Organic Contaminants ◽  
Oil Sands ◽  
Toxicity Testing ◽  
Salmo Gairdneri ◽  
Organic Carbon Content ◽  
Organic Analysis ◽  
Flow Through ◽  
Butyl Phthalate ◽  
Trace Organic

Abstract Acute toxicity testing using rainbow trout (Salmo gairdneri Richardson) was conducted on two wastewater streams from an oil sands extraction and upgrading plant. The main effluent stream from the upgrading plant was non-acutely toxic in flow-through bioassay while the construction drainage from the tailings pond dyke was acutely lethal in static bioassay with an extrapolated LC50 of 11% (by volume). With no obvious toxicant present, trace organic analysis was undertaken based on the high indeterminate organic carbon content of the sample. Analysis by GC-MS of the sample was able to identify four compounds: 2, 6-di-tert-butyl-p-cresol, (BHT); di-n-butyl phthalate, (DBP); bis (2-ethylhexyl) adipate, (BEHA); and bis (2-ethylhexyl) phthalate, (BEHP). Toxicity testing of the compounds required the evaluation of various schemes for the preparation of the test mixtures. Direct emulsion of the test compounds in water was ultimately adopted. Ninety-six hour static bioassays with rainbow trout indicated LC50 values of 540 mg/l for BEHP, 3 mg/l for BHT, 1.2 mg/l for DBP, and an approximate range of 54–110 mg/l for BEHA. Loss of emulsified components from the test mixture during the bioassays suggested that calculated LC50 values likely underestimate the actual toxicity of the compounds. The contribution by BEHA and BEHP to the whole effluent toxicity was likely minor while BHT and DBP indicated sufficient acute lethal toxicity to warrant further consideration. The feasibility of trace organic analysis and component toxicity testing as a means for conducting longer term research on oil sands wastewaters was demonstrated.

LFERs for Soil Organic Carbon−Water Distribution Coefficients (KOC) at Environmentally Relevant Sorbate Concentrations

2009 ◽  
Vol 43 (9) ◽  
pp. 3094-3100 ◽  
Author(s):  
Satoshi Endo ◽  
Peter Grathwohl ◽  
Stefan B. Haderlein ◽  
Torsten C. Schmidt
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Water Distribution ◽  
Distribution Coefficients

scholarly journals Measuring experimental cyclohexane-water distribution coefficients for the SAMPL5 challenge

2016 ◽  
Vol 30 (11) ◽  
pp. 945-958 ◽  
Author(s):  
Ariën S. Rustenburg ◽  
Justin Dancer ◽  
Baiwei Lin ◽  
Jianwen A. Feng ◽  
Daniel F. Ortwine ◽  
...  
Keyword(s):  
Water Distribution ◽  
Distribution Coefficients
Sign in / Sign up

Export Citation Format

Share Document