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Title: Extraction rates of spiked versus native PAHs from heterogeneous environmental samples using supercritical fluid extraction and sonication in methylene chloride

Abstract

The relative extraction rates of native polycyclic aromatic hydrocarbons (PAHs) ranging from naphthalene (M = 128) to benzo[b]fluoranthene (M = 252) and those of spiked deuterated PAHs (d-PAHs) from heterogeneous environmental samples including petroleum waste sludge, urban air particulate matter (SRM 1649), and railroad bed soil were compared using sequential extractions with pure supercritical CO[sub 2] or modified (10% v/v methanol) supercritical CO[sub 2] and using sonication with methylene chloride. Regardless of the spiking method (injection of the spike or suspension of the sample in the spiking solution) or aging time (up to 14 h), the extraction rates of most of the spiked d-PAHs were substantially (up to 10-fold) higher than those of the same native PAHs. Differences in extraction rates of the spiked and native PAHs were most dramatic for the lower molecular weight PAHs, indicating that relatively volatile species such as naphthalene must be tightly bound in order to remain associated with a real-world sample. In most cases, 30-min extractions with pure CO[sub 2] quantitatively recovered (>90%) the spiked deuterated-PAHs, but only extracted ca.25-80% of the native PAHs. Similar differences were observed using conventional methylene chloride sonication, demonstrating that spike recovery studies are not valid for developing quantitativemore » extraction methods for heterogeneous environmental samples. 21 refs., 8 figs., 4 tabs.« less

Authors:
; ;  [1]
  1. Univ. of North Dakota, Grand Forks (United States)
Publication Date:
OSTI Identifier:
6297471
Resource Type:
Journal Article
Journal Name:
Analytical Chemistry (Washington); (United States)
Additional Journal Information:
Journal Volume: 65:11; Journal ID: ISSN 0003-2700
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; POLYCYCLIC AROMATIC HYDROCARBONS; SOLVENT EXTRACTION; CARBON DIOXIDE; DEUTERIUM COMPOUNDS; EXPERIMENTAL DATA; METHYLENE CHLORIDE; NAPHTHALENE; SOUND WAVES; SUPERCRITICAL STATE; AROMATICS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CONDENSED AROMATICS; DATA; EXTRACTION; HYDROCARBONS; HYDROGEN COMPOUNDS; INFORMATION; NUMERICAL DATA; ORGANIC CHLORINE COMPOUNDS; ORGANIC COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SEPARATION PROCESSES; 400201* - Chemical & Physicochemical Properties; 400105 - Separation Procedures

Citation Formats

Burford, M D, Hawthorne, S B, and Miller, D J. Extraction rates of spiked versus native PAHs from heterogeneous environmental samples using supercritical fluid extraction and sonication in methylene chloride. United States: N. p., 1993. Web. doi:10.1021/ac00059a003.
Burford, M D, Hawthorne, S B, & Miller, D J. Extraction rates of spiked versus native PAHs from heterogeneous environmental samples using supercritical fluid extraction and sonication in methylene chloride. United States. doi:10.1021/ac00059a003.
Burford, M D, Hawthorne, S B, and Miller, D J. Tue . "Extraction rates of spiked versus native PAHs from heterogeneous environmental samples using supercritical fluid extraction and sonication in methylene chloride". United States. doi:10.1021/ac00059a003.
@article{osti_6297471,
title = {Extraction rates of spiked versus native PAHs from heterogeneous environmental samples using supercritical fluid extraction and sonication in methylene chloride},
author = {Burford, M D and Hawthorne, S B and Miller, D J},
abstractNote = {The relative extraction rates of native polycyclic aromatic hydrocarbons (PAHs) ranging from naphthalene (M = 128) to benzo[b]fluoranthene (M = 252) and those of spiked deuterated PAHs (d-PAHs) from heterogeneous environmental samples including petroleum waste sludge, urban air particulate matter (SRM 1649), and railroad bed soil were compared using sequential extractions with pure supercritical CO[sub 2] or modified (10% v/v methanol) supercritical CO[sub 2] and using sonication with methylene chloride. Regardless of the spiking method (injection of the spike or suspension of the sample in the spiking solution) or aging time (up to 14 h), the extraction rates of most of the spiked d-PAHs were substantially (up to 10-fold) higher than those of the same native PAHs. Differences in extraction rates of the spiked and native PAHs were most dramatic for the lower molecular weight PAHs, indicating that relatively volatile species such as naphthalene must be tightly bound in order to remain associated with a real-world sample. In most cases, 30-min extractions with pure CO[sub 2] quantitatively recovered (>90%) the spiked deuterated-PAHs, but only extracted ca.25-80% of the native PAHs. Similar differences were observed using conventional methylene chloride sonication, demonstrating that spike recovery studies are not valid for developing quantitative extraction methods for heterogeneous environmental samples. 21 refs., 8 figs., 4 tabs.},
doi = {10.1021/ac00059a003},
journal = {Analytical Chemistry (Washington); (United States)},
issn = {0003-2700},
number = ,
volume = 65:11,
place = {United States},
year = {1993},
month = {6}
}