Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound

Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound

Bibliographic Details
Main Author: Kohan, Danielle
Language:English
Published: The Ohio State University / OhioLINK 2018
Subjects:
Environmental Science
Water
Ultrasound
Freshwater sediment
Solid Phase Microextraction
Polycyclic Aromatic Hydrocarbons
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=osu1534589087899084
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-osu15345890878990842021-08-03T07:08:18Z Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound Kohan, Danielle Environmental Science Water Ultrasound Freshwater sediment Solid Phase Microextraction Polycyclic Aromatic Hydrocarbons Legacy environmental pollution of hydrophobic contaminants, such as polycyclicaromatic hydrocarbons (PAHs), continues to threaten aquatic and benthic organisms. This typeof persistent contaminant binds to sediment and slowly releases into the overlying water overtime. Removal of the contaminated sediment is cost prohibitive, demonstrating the need fordevelopment of in-situ remediation strategies. Ultrasound (US) has potential to release PAHsfrom the sediment and degrade them while they are in the water, but it is unclear how much PAHrelease occurs in the presence of US. In this study, solid phase microextraction (SPME), arelatively new passive sampling method, is used to estimate aqueous concentration. Samplingwith SPME is used to determine the change in aqueous concentration as a response to US.The kinetic response in aqueous phase PAH concentration to Little Scioto River creosotecontaminated sediment exposed to 20 kHz ultrasound (US) at a power of 430 W/L wasdetermined using SPME. First, the time necessary for the SPME fiber to contact a systemcontaining aqueous PAHs was determined to be 10 minutes. Then, SPME fiber/water partitioncoefficients, Kspme10, were experimentally determined and shown to be comparable withprevious studies. Next, SPME measurements were taken by exposing fresh, conditioned fibers ina reactor containing the contaminated sediment and DI water for 10 minute periods. Threeconsecutive periods each were taken during US and after US, respectively, for a total of 30minutes during US and 30 minutes after. US was observed to have a significant increase on PAHrelease during ultrasound compared with only mixing. This effect is attributed to fragmentationand erosion of particles, by US, exposing internal pores, and easing the release of tightly boundPAHs into the aqueous phase. In addition, for phenanthrene, anthracene, and fluoranthene, USshowed significantly higher aqueous concentrations during US compared with after US. Forthese less soluble PAHs, anthracene, phenanthrene, and pyrene, the release into the aqueous phase reaches and surpasses the aqueous solubility limit of ambient water, indicating US affectsthe aqueous solubility limit of PAHs. A comparison of the total PAH amount bound to sedimentsbefore and after US revealed an apparent decrease in PAH levels after US exposure. The USdegradation of PAHs may foster the release of additional PAHs from the sediment to maintainaqueous concentrations facilitated during ultrasound. However, when US is ceased, excess PAHappears to resorb onto sediment resulting in the lower concentration measured in these PAHcompounds after US. 2018 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1534589087899084 http://rave.ohiolink.edu/etdc/view?acc_num=osu1534589087899084 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Environmental Science
Water
Ultrasound
Freshwater sediment
Solid Phase Microextraction
Polycyclic Aromatic Hydrocarbons
spellingShingle Environmental Science
Water
Ultrasound
Freshwater sediment
Solid Phase Microextraction
Polycyclic Aromatic Hydrocarbons
Kohan, Danielle
Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
author Kohan, Danielle
author_facet Kohan, Danielle
author_sort Kohan, Danielle
title Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
title_short Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
title_full Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
title_fullStr Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
title_full_unstemmed Using Solid Phase Microextraction to Measure Aqueous PAH Release from Contaminated Sediment During Ultrasound
title_sort using solid phase microextraction to measure aqueous pah release from contaminated sediment during ultrasound
publisher The Ohio State University / OhioLINK
publishDate 2018
url http://rave.ohiolink.edu/etdc/view?acc_num=osu1534589087899084
work_keys_str_mv AT kohandanielle usingsolidphasemicroextractiontomeasureaqueouspahreleasefromcontaminatedsedimentduringultrasound
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