Abstract:

Analytical results of 29 sediment samples collected by USGS-NWRC in 2011. Sample locations were chosen and sampled by USGS-NWRC based on changes in PolSAR backscatter mechanisms for which they developed a classification scheme for in their previous research. Samples were analyzed for a targeted list of petrogenic compounds to verify their classification scheme, and were oil source-fingerprinting to verify MC252 oil in marshes beyond the oiled shorelines.

Suggested Citation:

Meyer, Buffy. 2016. Normal alkane and polycyclic hydrocarbon concentrations, and diagnostic biomarker analyses for sediment samples collected based on changes in PolSAR backscatter from 2010 to 2011 in Barataria Bay. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7XG9P26

Purpose:

The objective of the research was to confirm whether the spatial distribution of MC252 oil determined from ground validation corroborated the PolSAR backscatter indicator of oil extent; mainly, did MC252 oil reach further into the marshlands, as indicated by PolSAR backscatter, than the shoreline oiling detected in visual and optical surveys?

Data Parameters and Units:

File: FINAL Diagnostics Ratios.xlsx Worksheet: DBTs to Phens Parameter Descriptions: Ratios of C2 and C3 dibenzothiophenes to phenanthrenes Worksheet: Biomarker DR Parameter Descriptions: Hopanes (m/z 191); Diasteranes and Regular 14a(H)-Steranes (m/z 217); 14B(H)-Steranes (m/z 218); Triaromatic Steriods (m/z 231); Ratios of C2 and C3 dibenzothiophenes to phenanthrenes Worksheet: Critical Difference Calcs Parameter Descriptions: MC 252 DR (diagnostic ratio), Sample DR (diagnostic ratio), Mean (avg of MC252 DR and Sample DR), Ab Diff (Absolute Difference), CD (Critical Difference) values for Hopanes (m/z 191), Diasteranes and Regular 14a(H)-Steranes (m/z 217), 14B(H)-Steranes (m/z 218), Triaromatic Steriods (m/z 231), Ratios of C2 and C3 dibenzothiophenes to phenanthrenes at each sampling location Worksheet: Biomarker DR Sort Parameter Descriptions: Sample DR (diagnostic ratio; based on Critical Difference), Total MC 252 DR (diagnostic ratio), Score (sample DRs divided by MC 252 ratios yielding a percentage final score), and Conclusion (Score of 93-100% = match; 80-92% = probable match; 50-79% = inconclusive; and < 50% = non-match) File: FINAL C2 and C3 ratios.xlsx Worksheet: Sheet 1 Parameter Descriptions: Raw Area Response values for C2 and C3 dibenzothiophenes and phenanthrenes and ratios of C2 and C3 dibenzothiophenes to phenanthrenes File: FINAL GCMS Results w Blanks.xlsx Worksheet: USGS GCMS Final Parameter Descriptions: LSU/RCAT ID# (internal identifier); Field ID (sample location identifier); initial sediment weight volume (mg = milligrams); final extract volume (ml = milliliters); % moisture; concentration of 27 alkanes (ug/g microgram per gram); Alkane MDL (ug/g); Alkane Reporting Limit (ug/g); concentration of 43 aromatics (ng/g nanograms per gram); Aromatic MDL (ng/g); Aromatic Reporting Limit (ng/g); % surrogate recovery Worksheet: Method Blank Final Parameter Descriptions: LSU/RCAT ID# (internal identifier); Field ID (n/a); initial sediment weight volume (mg = milligrams); final extract volume (ml = milliliters); % moisture; concentration of 27 alkanes (ug/g microgram per gram); Alkane MDL (ug/g); Alkane Reporting Limit (ug/g); concentration of 43 aromatics (ng/g nanograms per gram); Aromatic MDL (ng/g); Aromatic Reporting Limit (ng/g); % surrogate recovery File: FINAL Percent Moisture.xlsx Worksheet: USGS Moisture Final Parameter Descriptions: USGS ID (sample location identifier; LSU ID (internal identifier); Tray wt. (g); initial weight (g); final weight (g); % moisture File: FINAL Sample Info.xlsx Worksheet: USGS Sample Info Final Parameter Descriptions: USGS ID (sample location identifier; LSU ID (internal identifier); Soxhlet Extracted Wt. (g); Final Extract Volume (mL); % Moisture; Data File Name Site Sampling Date Latitude Longitude 1S 07/7-8/2011 29.4519811010091 -89.8950356445344 5S 07/7-8/2011 29.4557399894069 -89.8909892609594 9A 07/7-8/2011 29.4559680210949 -89.8908720629955 RH 07/7-8/2011 29.4569384387525 -89.8914561122974 27S 07/7-8/2011 29.4763326192886 -89.8436628429273 31S 07/7-8/2011 29.4606977565476 -89.8840599015674 32S 07/7-8/2011 29.4585610045783 -89.8890081191019 33S 07/7-8/2011 29.4542360319299 -89.8962745408593 34I 07/7-8/2011 29.4763037258817 -89.8361474959643 24I 07/7-8/2011 29.4802537219579 -89.8777279740403 2N 07/7-8/2011 29.4521582389324 -89.8951849514591 32I 07/7-8/2011 29.458738820354 -89.8891265278234 678I 07/7-8/2011 29.4563587491994 -89.8907388693291 28I 07/7-8/2011 29.4591719295623 -89.8653523380336 29S 07/7-8/2011 29.4621610659271 -89.8731250237057 3&4I 07/7-8/2011 29.45239488653 -89.8955008349621 27I 07/7-8/2011 29.4767562852136 -89.8436746775619 25S 07/7-8/2011 29.4849194664471 -89.8419646888932 28S 07/7-8/2011 29.4589978616103 -89.8650588701687 23I 07/7-8/2011 29.4801749827017 -89.8763650613429 29I 07/7-8/2011 29.4625286354623 -89.8732281500149 33I 07/7-8/2011 29.4538804137639 -89.8960377118659 34S 07/7-8/2011 29.4754704677636 -89.83715507633 24S 07/7-8/2011 29.4801854014843 -89.8775508025207 26S 07/7-8/2011 29.4706661139726 -89.8128088668289 30I\S 07/7-8/2011 29.4561598833772 -89.8757795636805 23S 07/7-8/2011 29.4801865465679 -89.876664326949 26I 07/7-8/2011 29.4702832875102 -89.8125715263296 25I 07/7-8/2011 29.4851283494424 -89.8414756952064

Methods:

UAVSAR Sediment extraction (EPA SW-846 method 3540C) GC/MS-SIM

Instruments:

UAVSAR GC/MS

Error Analysis:

Percent relative standard deviation (coefficient of variation) Repeatability with expected normal distribution variance

Individual Files: