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Analytical support of the Coastal Waters Consortium: Target alkane and aromatic concentrations for sediment samples collected in 2010-2014Coastal Waters Consortium II (CWC II)
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Suggested Citation:
Ashton-Meyer, Buffy (2017) Analytical support of the Coastal Waters Consortium: Target alkane and aromatic concentrations for sediment samples collected in 2010-2014. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University-Corpus Christi. doi:10.7266/N7028PZZ
Abstract:
Gas chromatography/mass spectrometry (GC/MS) analytical results of sediment samples collected by Coastal Waters Consortium researchers from 2010 to 2014. This dataset contains 3 files: (1) a master file containing all sediment sample information, total target alkane and aromatic concentrations, and qualitative oil source-fingerprinting determinations for each sample (R4.x264.000:0056_Master Oil Dataset_Sediment_2010-2014_sub1.xlsx); (2) a Windows folder (R4.x264.000:0056_Concentration Workbooks_Sediment Data_2010-2014) containing 10 excel files (organized by Principal Investigator) that provides individual concentrations of target alkane and aromatic analytes for all sediment samples listed in R4.x264.000:0056_Master Oil Dataset_Sediment_2010-2014_sub1.xlsx; (3) an excel file containing correction factor determinations for sediment samples that were contaminated by the freeze-drying process (R4.x264.000:0056_Correction Factor Documentation_sub1.xlsx).
Purpose:
In support of the Coastal Waters Consortium's effort to assess the chemical evolution, biological degradation, and environmental stresses of petroleum and dispersant within Gulf of Mexico coastal and shelf ecosystems.
Theme Keywords:
gas chromatography, mass spectrometry, aromatics, alkanes, surface sediments, coastal marshes
File Format:
xlsx
Filename:
R4.x264.000-0056.zip (1.95 MB)
Dataset Downloads:
13
Analytical support of the Coastal Waters Consortium: Target alkane and aromatic concentrations for sediment samples collected in 2010-2014
Identification Information
Distribution Information
Metadata Maintenance Information
Metadata:
File identifier:
R4.x264.000-0056-metadata.xml
Language:
eng; USA
Character set:
Character set code:
utf8
Hierarchy level:
Scope code:
dataset
Metadata author:
Responsible party:
Individual name:
Jason Weick
Organisation name:
Louisiana Universities Marine Consortium (LUMCON) / Data Management
Position name:
IT Manager
Contact info:
Contact:
Phone:
Telephone:
Voice:
9858512827
Facsimile:
Address:
Address:
Delivery point:
8124 Highway 56
City:
Chauvin
Administrative area:
Louisiana
Postal code:
70344
Country:
USA
Electronic mail address:
jweick@lumcon.edu
Role:
Role code:
pointOfContact
Date stamp:
2018-08-11T13:41:58+00:00
Metadata standard name:
ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data
Metadata standard version:
ISO 19115-2:2009(E)
Dataset URI:
https://data.gulfresearchinitiative.org/metadata/R4.x264.000:0056
Return To Index
Identification info:
Data identification:
Citation:
Citation:
Title:
Analytical support of the Coastal Waters Consortium: Target alkane and aromatic concentrations for
sediment samples collected in 2010-2014
Alternate title:
Date:
Date:
Date:
2017-02-17
Date type:
Date type code:
revision
Abstract:
Gas chromatography/mass spectrometry (GC/MS) analytical results of sediment samples collected by Coastal
Waters Consortium researchers from 2010 to 2014. This dataset contains 3 files: (1) a master file containing
all sediment sample information, total target alkane and aromatic concentrations, and qualitative oil
source-fingerprinting determinations for each sample (R4.x264.000:0056_Master Oil
Dataset_Sediment_2010-2014_sub1.xlsx); (2) a Windows folder (R4.x264.000:0056_Concentration
Workbooks_Sediment Data_2010-2014) containing 10 excel files (organized by Principal Investigator) that
provides individual concentrations of target alkane and aromatic analytes for all sediment samples listed in
R4.x264.000:0056_Master Oil Dataset_Sediment_2010-2014_sub1.xlsx; (3) an excel file containing correction
factor determinations for sediment samples that were contaminated by the freeze-drying process
(R4.x264.000:0056_Correction Factor Documentation_sub1.xlsx).
Purpose:
In support of the Coastal Waters Consortium's effort to assess the chemical evolution, biological degradation,
and environmental stresses of petroleum and dispersant within Gulf of Mexico coastal and shelf ecosystems.
Status:
Progress code:
completed
Point of contact:
Responsible party:
Individual name:
Buffy Ashton-Meyer
Organisation name:
Louisiana State University / Department of Environmental Sciences
Position name:
Research Associate
Contact info:
Contact:
Phone:
Telephone:
Voice:
2255784293
Facsimile:
Address:
Address:
Delivery point:
School of the Coast and Environment
1263 Energy, Coast and Environment Bldg
City:
Baton Rouge
Administrative area:
Louisiana
Postal code:
70803
Country:
USA
Electronic mail address:
bashton@lsu.edu
Role:
Role code:
principalInvestigator
Descriptive keywords:
Keywords:
Keyword:
gas chromatography
Keyword:
mass spectrometry
Keyword:
aromatics
Keyword:
alkanes
Keyword:
surface sediments
Keyword:
coastal marshes
Type:
Keyword type code:
theme
Descriptive keywords:
Keywords:
Keyword:
Louisiana
Keyword:
Gulf of Mexico
Type:
Keyword type code:
place
Language:
eng; USA
Topic category:
Topic category code:
environment
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Temporal element:
Temporal extent:
Extent:
Time period:
Description:
ground condition
Begin date:
2010-07-06
End date:
2014-10-31
Supplemental Information:
File: R4.x264.000-0056_Master Oil Dataset_Sediment_2010-2014_sub1.xlsx Worksheet: 2010-2014 Sediment Data
“n/a” in any cell of the worksheet indicates the information was not available. Parameter Descriptions:
LSU/RCAT ID#: Internal sample identifier assigned by the analytical lab; Date Sample Collected: MM/DD/YYYY
or range of dates MM/DD-DD/YYYY; Date Sample Received in analytical lab: MM/DD/YYYY; Date Sample Extracted
by analytical lab: MM/DD/YYYY; Date Sample Analyzed: MM/DD/YYYY; Extraction Method: Extraction method used
on the sample (“Wet, Soxhlet”, “Wet, Sonication”, “Dry, PSE”, or “Wet, PSE”); Correction Factor Applied:
Indicates whether the correction factor was applied to the data (Yes/No); Latitude: Latitude where sample
was collected (decimal degrees); Longitude: Longitude where sample was collected (decimal degrees); Total
Alkanes (ug/g): Total of all alkane analytes in the sample; Total Aromatics (ng/g): Total of all aromatic
analytes in the sample; Macondo Biomarker Pattern: (A, B, AB, Other) A, AB, and B are all indicative of
relatively fresh to weathered MC252 oil; Biomarker pattern C is indicative of oil other than MC252; If field
is blank, no biomarker pattern was detected; Principal Investigator: CWC Principal Investigator by which or
for which the sample was collected; Sample Description: User defined descriptor for sample. Format and
content varies with each investigator; Sample Collection Depth (cm): Target depth for sediment sample
collection for oil analysis File: R4.x264.000-0056_Concentration Workbooks_Sediment Data_2010-2014 Windows
folder containing 10 excel files that provide individual targeted alkane and aromatic analyte concentrations
for all sediment samples listed in R4.x264.000-0056_Master Oil Dataset_Sediment_2010-2014_sub1.xlsx. Data is
organized by CWC Principal Investigator. Within each file samples are grouped by LSU/RCAT ID# on different
worksheets according to run batches (in other words, sequentially numbered batches of samples are on one
worksheet tab). LSU/RCAT ID#; Field ID#; Initial sediment weight (mg); Final extract volume (ml); Percent
moisture (%); Extraction method; Aromatic analytes (ng/g) Format and Data Parameters and Units are the same
for all files: LSU/RCAT ID#: Internal sample identifier assigned by the analytical lab). If a sample was too
concentrated it was diluted before analysis to minimize overloading the GC column and MS detector. Instances
of dilution are indicated with a dilution factor and an “X” following the LSU/RCAT ID#. Field ID#: User
defined descriptor for sample. Format and content varies with each investigator Initial Sediment Weight
(mg): Weight of sample extracted Final Extract Volume (ml): Volume of extracted sample after concentration
Percent Moisture: Percentage of water in each sediment sample Extraction Method: Extraction method used on
the sample (“Wet, Soxhlet”, “Wet, Sonication”, “Dry, PSE”, or “Wet, PSE”) Surrogate Corrected values for 28
alkane analytes (ug/g): Alkane concentrations, including two isoprenoids, after applying surrogate recovery
or extraction efficiency value. Concentrations are reported to three (3) significant figures. Surrogate
Corrected values for 43 aromatic analytes (ng/g): Aromatic concentrations for parent aromatic compounds and
alkyl homologs after applying surrogate recovery or extraction efficiency value. Concentrations are reported
to three (3) significant figures. Surrogate & Back Corrected values for 43 aromatic analytes (ng/g):
Aromatic concentrations for parent aromatic compounds and alkyl homologs after applying surrogate recovery
or extraction efficiency value, and after applying an average freeze-drier contamination correction factor.
Values highlighted in green-colored cells indicate samples that were affected by the freeze-drier
contamination discovered in 2013 (see metadata). Back corrected concentrations are reported to two (2)
significant figures. Gross Oil (above the LSU/RCAT ID#): a sample that was freeze-dried, but was not back
corrected. These samples had high concentrations of oil (i.e. detection of gross oil) that were orders of
magnitude higher than the freeze-drier contamination, and, therefore, were not back corrected. The
freeze-drier contamination greatly affected samples with trace levels of oil or background concentrations of
the target aromatics Elemental Sulphur Interference: Interference from elemental sulfur, reported in some of
the raw data, highlighted in blue-colored cells. It is visually evident in the chromatograms and affects the
integration of some analytes (mainly C-2 fluorenes, C-3 DBTs, and C-1 phenanthrenes) and in most cases the
interference prevents the integration of those compounds, so they are often 0.000. File:
R4.x264.000-0056_Correction Factor Documentation_sub1.doc Worksheet: ReadMe Documentation of the
contamination issue of some CWC-I sediments (LSU ID# 2013234‐13 through 2013234-32, LSU ID# 2013289-01
through 2013329-45, LSU ID# 2014058-01 through 2014115-08, LSU ID# 2014153-01 through 2014303-06) discovered
in 2013 including determination of a correction factor. Worksheet: Table 1 Generation of correction factors
from a data set of eight sediment samples extracted using Wet and Freeze-dried methodologies Worksheet:
Table 2 Final correction factors for Freeze-dried CWC-I Sediments |GC/MS-SIM Sediment extraction (modified
EPA SW-846 methods 3540C, 3550B, and 3545A): Wet, Soxhlet=sample was extracted without freeze-drying by
Soxhlet extraction (SW-846 3540C); Wet, Sonication=sample was extracted without freeze-drying by
ultrasonication extraction (SW-846 3550B); Dry, PSE=samples was freeze-dried and extracted by pressurized
solvent extraction (SW-846 3545A) Qualitative oil source-fingerprinting (ASTM D5739-00)|Pressurized solvent
extractor GC/MS|Surface samples (~5cm depth)|The Overton lab provided sample collection and storage
guidelines to all coPI's. Data quality could be affected if these guidelines were not followed. Quality
control samples were analyzed with each analytical sample sequence. These QC samples had to be within ±20%
of the original calibration values. Extraction efficiency was evaluated based on the percent recovery of the
surrogate standard added to each sample prior to extraction. The acceptable recovery range was 70-120%.
Method blanks were also extracted and quantitated every 12 samples. Any alkanes and aromatics detected in
the method blanks were surrogate corrected, averaged if multiple blanks were prepared for each sample batch,
and subtracted out of the surrogate corrected concentrations of alkanes and aromatics in each sediment
sample. Contamination of some CWC-I sediments (LSU ID# 2013234‐13 through 2013234-32, LSU ID# 2013289-01
through 2013329-45, LSU ID# 2014058-01 through 2014115-08, LSU ID# 2014153-01 through 2014303-06) was
discovered in 2013. The source of contamination was determined to be the sediment freeze-drying process. Two
different freeze-driers were utilized to dry sediments prior to extraction and both were contaminated by
vapors that remained in the systems after heavily contaminated samples were dried. The naphthalenes,
fluorenes, phenanthrenes and dibenzothiophenes were the most affected aromatic families, while compounds
starting with and including anthracene were least affected. The normal alkanes and oil biomarkers in all
samples were unaffected by the contamination, as were samples that contained gross amounts of oil. In an
attempt to rectify the affected data, a correction factor was determined based on a ratio calculated from
the average of eight (8) sediment samples that were extracted by both wet sediment and freeze-dried sediment
extraction methods. By calculating the correction factor in this manner, a direct comparison between
concentrations in the same sample and from each extraction methodology could be compared. See Dataset
1_Correction Factor Documentation.xls for details. All other sediment data were extracted using a wet
sediment extraction procedure and were unaffected.|
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Distribution info:
Distribution:
Distributor:
Distributor:
Distributor contact:
Responsible party:
Organisation name:
Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC)
Contact info:
Contact:
Phone:
Telephone:
Voice:
3618253604
Address:
Address:
Delivery point:
6300 Ocean Drive
City:
Corpus Christi
Administrative area:
TX
Postal code:
78412
Country:
USA
Electronic mail address:
griidc@gomri.org
Online Resource:
Online Resource:
Linkage:
URL:
https://data.gulfresearchinitiative.org
Role:
Role code:
distributor
Distributor format:
Format:
Name:
xlsx
Version:
inapplicable
File decompression technique:
zip
Distributor transfer options:
Digital transfer options:
Transfer size:
1.9533
Online:
Online Resource:
Linkage:
URL:
https://data.gulfresearchinitiative.org/data/R4.x264.000:0056
Protocol:
https
Name:
Data Landing Page
Description:
GRIIDC dataset landing page
Function:
Online function code:
information
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Metadata maintenance:
Maintenance information:
Maintenance and update frequency:
unknown
Maintenance note:
This ISO metadata record was automatically generated from information provided to GRIIDC for dataset:
R4.x264.000:0056 on 2020-01-27T11:52:45-06:00
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