Detection of Environmental Contaminants Caused by the Oil Spill in the Gulf of Mexico by GC and Hplc
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1 Detection of Environmental Contaminants Caused by the Oil Spill in the Gulf of Mexico by GC and Hplc Sky Countryman, Ngoc Nguyen, Jeff Layne, Kory Kelly, and Zeshan Aqeel Phenomenex, Inc., 411 Madrid Ave., Torrance, CA USA PO _L_2
2 Abstract The recent oil spill in the Gulf of Mexico is undeniably the largest oil leak in US history. The objective of this work was to provide analytical methods for analyzing the most common contaminants. Several rapid cleanup procedures utilizing SPE or GPC followed by analysis with GC-FID, GC/MS, or HPLC were developed for detecting Polycyclic Aromatic Hydrocarbons (PAHs) and other Petroleum Hydrocarbons. Total petroleum content in aqueous samples was determined by GC and classified by boiling point range: gasoline range (GRO), diesel range (DRO), or oil range organics (ORO). We are able to improve retention for the GRO portion, allowing for more accurate determination of the light hydrocarbons present in the sample. This is important because the lighter hydrocarbons are the ones that people are most likely to be exposed to from inhalation. The nature of some of the early samples collected suggested that it was composed of extremely high molecular weight materials with boiling ranges in the ORO. These samples require the use of specialized metal GC columns that are capable of withstanding temperatures above 430 C. Methodologies are presented to characterize hydrocarbon samples that contain species higher than C120. Traditional approaches to hydrocarbon testing provide a sum of the hydrocarbon material present in the sample but make no distinction between the types of hydrocarbons. While these methods give a general understanding of the sample, they do not accurately describe its toxic potential. To give a more accurate assessment of sample toxicity, samples were fractionated using a silica gel SPE cartridge, into an aromatic and an aliphatic portion. The fractions are then run separately by GC-FID and the level of specific compounds, which are known to be toxic, can be measured. An alternative procedure of extracting PAH isomers from water using solid phase extraction (SPE) followed by analysis by GC/MS is also demonstrated.
3 Introduction The 2010 Gulf of Mexico oil spill is the largest accidental marine oil spill in the history of the petroleum industry. Though massive efforts have been made to stop and/or control the damage, negative environmental impact has already occurred. The extent of the damage is not yet known. Since the majority of the spilled oil is composed of the Louisiana Sweet Crude, this oil contains a variety of compounds such as aliphatic, aromatic, and alkylaromatic hydrocarbons. In order to help understand the impact that the oil spill has caused, laboratories are looking for rapid and robust analytical procedures to characterize the hydrocarbon contaminants. This work provides SPE, GPC, GC-FID, GC/MS, and HPLC analytical methods for analyzing the most common contaminants that originated from the leak: Polycyclic Aromatic Hydrocarbons (PAHs), Petroleum Hydrocarbons (PHCs), and Volatile Organic Compounds (VOCs). Prior to analysis, samples underwent a cleanup or a sample preparation procedure. In this work, GPC was used as the initial cleanup technique for removing high molecular weight impurities. An alternative cleanup procedure was done with a silica gel SPE cartridge, Strata EPH. Compared to traditional analytical methods which only characterize hydrocarbon samples as a whole, the Strata EPH cartridge fractionates the sample into an aromatic and aliphatic portions. This allows for a better understanding of the sample s toxic potential. Following GPC cleanup or SPE fractionation, the components were analyzed by GC-FID, GC/MS, or HPLC. GC was used to analyze total petroleum hydrocarbon content, PAHs, oil, and VOCs while HPLC was used to analyze PAHs.
4 Sample Preparation Techniques Figure 1. GPC Cleanup using EnviroSep -ABC Following NOAA Technical Memorandum NMFS-NWFSC-59 mau Column: EnviroSep-ABC Dimensions: 300 x 7.8 mm ID Part No.: 00H-3035-K0 Mobile Phase: Methylene Chloride Flow Rate: 0.58 ml/min Temperature: Ambient Detector: 254 nm Sample: 1. DOB 2. Perylene DOB Maximized Elution Window Perylene min
5 Introduction In order to understand the impact of the Gulf Oil spill contamination, the oil must first be extracted from the matrix and subjected to various cleanup procedures to remove potential interferences. There are various procedures that can be used for this work, including Liquid-Liquid Extraction (LLE), Gel Permeation Chromatography (GPC), and Solid Phase Extraction (SPE). Oil leakeage into the Gulf of Mexico has contaminated plants, animals, and the beach itself. Although shellfish are at particular risk of contamination, the analysis of PAHs and other hydrocarbons from shellfish can be challenging due to the lipid content in animal tissue. The National Oceanic and Atmospheric Administration (NOAA) Technical Memorandum NMFS-NWFSC-59 for extraction and cleanup of sediments and tissues identifies GPC as a cleanup technique for removing high-molecular weight impurities using the EnviroSep-ABC 350 mm x 21.2 mm column. 3 Figure 1 shows the calibration solution indicating the window that would be used to collect the more toxic PAHs. The EnviroSep-ABC material was specifically designed to be used for this type of cleanup methodology. The carefully controlled particle size and pore size distribution of this material ensure that it maximizes separation between the target PAH isomers and the high-molecular weight impurities is maximized. Traditional approaches to hydrocarbon testing provide a sum total of the material present in the sample but make no distinction between the different types of hydrocarbons. Newer methodologies utilize a silica gel SPE cartridge to fractionate the sample into an aromatic and an aliphatic portions so that a more accurate sample toxicity can be assigned (Figure 2). The Strata EPH material was specially designed to overcome common problems with these methods, such as tube contamination and tube-to-tube flow consistency (Figure 3). The Strata EPH material provides highly reproducible fractionation of petroleum samples (Tables 1 & 2). The EPA s sampling plan utilizes EPA Method 8015B for Total Petroleum Hydrocarbon (TPH) and EPA Method 8270 for semi-volatile contaminants including PAHs. 4 Total petroleum hydrocarbon analysis is a sum of what is considered the gasoline range organics (GRO) and the diesel or oil range organics (DRO or ORO). 5 The lighter GRO fraction is commonly analyzed using purge and trap or other techniques that introduce only the volatile portion of the sample (Figure 4 & 5). The Zebron ZB-1 and ZB-624 GC columns are able to improve retention for these volatile compounds, allowing for more accurate determination of the light hydrocarbons present in the sample. This is important because the lighter hydrocarbons are the ones that populations in the region are likely to be exposed from inhalation. The heavier DRO or ORO portion of the sample can include hydrocarbons from C10 to C44 or more. Based on the high asphaltene content in the early samples received by Ed Overton s group at Louisiana State University, the gulf oil crude may contain very heavy hydrocarbons that cannot be eluted using traditional polyimide-coated GC columns. Such cases require the use of specialized metal GC columns, such as the Zebron ZB-1XT SimDist columns, which can be used to characterize hydrocarbon samples containing species higher than C120 (Figure 6). PAHs are a particularly toxic class of compounds found in petroleum products and pose a significant health risk. The EPA gives two primary techniques for the analysis of PAH in solid materials, GC/MS and HPLC. The primary method proposed for the cleanup effort is EPA Method 8270, which uses GC/MS. The Zebron ZB-5ms GC column improves resolution of isomers, such as Benzo[b] and Benzo[k]fluoranthene, allowing for the analysis time to be shortened to accommodate higher sample throughput (Figure 7). The analysis of PAHs can also be done using HPLC, following EPA Method 8310 guidelines. There have been significant advances in particle technology and HPLC systems in the past several years that allow many older methods to be dramatically improved. One such technology is the Kinetex core-shell particle, which provides ultra-high efficiency separations on standard HPLC instruments. Using these columns, the separation of the standard 16 PAH compounds can be done in less than 6 minutes (Figure 8).
6 Introduction Figure 2. Extractable Petroleum Hydrocarbon (EPH) Fractionation Using Strata -EPH 1. Liquid-Liquid Extraction using 60 ml methylene chloride, followed by concentration and solvent exchange to hexane. 2. The final 1 ml hexane extract is spiked with 1 ml of fractionation surrogates (2-fluorobiphenyl and 2-bromonaphthalene) and loaded onto the Strata-EPH 5 g/20 ml SPE Tube 3. Aliphatic Fraction Aliphatic hydrocarbons were eluted with 11 ml of hexane. The eluate was concentrated to a final volume of 1 ml and analyzed by GC/FID 4. Aromatic Fraction The aromatic hydrocarbons were eluted with 20 ml of dichloromethane. The eluate was concentrated to a final volume of 1 ml and analyzed by GC/FID
7 Table 1. Results for the Aliphatic Fraction using Strata-EPH Peak Compound % Recovery % RSD (n=3) 1 n-nonane (C9) n-decane (C10) n-dodecane (C12) n-tetradecane (C14) Butylhydroxytoluene (BHT) 6 n-hexadecane (C16) n-octadecane (C18) n-nonadecane (C19) n-eicosane (C20) a-Androstane (IS) 11 1-Chloro-Octadecane (Surr) 12 n-docodane (C22) n-tetracosane (C24) n-hexacosane (C26) n-octacosane (C28) n-triacotane (C30) n-hexatriacontane (C36) High Recoveries for the volatile C9-C12 hydrocarbons
8 Table 2. Results for the Aromatic Fraction using Strata-EPH Peak Compound % Recovery % RSD (n=3) 1 Naphthalene* Methylnaphthalene* Fluorobiphenyl (Frac Surr) Acenaphthalene Bromonaphthalene (Frac Surr) 6 Acenaphthene Phthalate Fluorene Phanthrene Anthracene o-terphenyl (Surr) 12 5-a-Androstane 13 Fluoranthene Chloro-Octadecane (Surr-Aliphatic) 15 Pyrene Benz[a]anthracene Chrysene Benzo[b]fluoranthene Benzo[k]fluoranthene Benzo[a]pyrene Indeno[1,2,3-cd]pryene Dibenz[a,h]anthracene Benzo[g,h,i]perylene Low % RSD from tube to tube ensures reproducible fractionation
9 Figure 3. Contamination Level of BHT from Strata-EPH and Conventional SPE Tubes Strata EPH Conventional silica-gel BHT concentration (ppm) Lower levels of BHT contamination in comparison to conventional silica gel SPE tubes. Aliphatic Fraction Aromatic Fraction
10 Analysis Techniques Figure 4. Fast Gasoline Range Organic Separation using Zebron ZB-1 Column: Zebron ZB-1 Dimensions: 30 meters x 0.25 mm x 0.25 μm Part No: 7HG-G Injection: Split 250 C, 1 μl Carrier Gas: Helium C (constant flow) Oven Program: 35 C (2 min) to C/min Detector: 300 C Sample: 220 ppm GROs in Methanol 1. 3-Methylpentane 2. 2,2,4-Trimethylpentane 3. Benzene 4. Toluene 5. Ethylbenzene 6. m-xylene 7. o-xylene 8. 1,2,4-Trimethylbenzene 9. Napthalene App ID min
11 Figure 5. Fast Analysis of Volatile Organics from Water using Purge & Trap GC/MS Column: Zebron ZB-624 Dimensions: 20 meter x 0.18 mm x 1.00 µm Part No.: 7FD-G Injection: Purge and Trap Carrier Gas: Helium (constant flow) Oven Program: 35 C to 210 C Detector: MSD; amu Sample: Chloromethane 3. Vinyl Bromomethane chloride Chloroethane 6. Trichlorofluoromethane 7. Ethanol 8. Dichlorotrifluoroethane 9. Acrolein 10. Trichlorotrifluoroethane 11. 1, Acetone 1-Dichloroethene Methyl Carbon iodide 14. Methylene disulfide 15. t-butanol chloride trans-1,2-dichloroethane 18. Methyl-t-butyl Acrylonitrile ether , Vinyl 1-Dichloroethane 21. Diisopropyl Acetate 22. Ethyl-t-butyl ether 23. 2, 2-Dichloropropane ether cis-1, 2-Butanone 2-Dichloroethene Bromochloromethane 28. Chloroform 29. Tetrahydrofuran 30. 1, 1, 1-Dichloropropene 1-Trichloroethane Carbon 1, 2-Dichloroethane-d4 tetrachloride Benzene 35. 1, t-amyl 2-Dichloroethane 36. Fluorobenzene methyl ether Trichloroethene 39. 1, Dibromomethane 2-Dichloropropane Bromodichloromethane Chloroethylvinyl cis-1, 3-Dichloropropene ether Methyl Toluene-d8 isobutyl ketone trans-1, 2-Trichloroethane 3-Dichloropropene Tetrachloroethene 50. 1, 2-Hexanone 3-Dichloropropane Dibromochloromethane 53. Ethylene Chlorobenzene dibromide , Ethylbenzene 1, 1, 2-Tetrachloroethane m,p-xylene 58. o-xylene 59. Styrene 60. Bromoform 61. Isopropylbenzene Bromofluorobenzene 63. 1, Bromobenzene 1, 2, 2-Tetrachloroethane , n-propylbenzene 2, 3-Trichloropropane Chlorotoluene 68. 1, 4-Chlorotoluene 3, 5-Trimethylbenzene tert-butylbenzene 71. 1, sec-butylbenzene 2, 4-Trimethylbenzene , 4-Isopropyltoluene 3-Dichlorobenzene , n-butylbenzene 4-Dichlorobenzene Dichlorobenzene-d ,2-Dibromo-3-chloropropane Hexachlorobutadiene 2, 4-Trichlorobenzene Naphthalene 1, 2, 3-Trichlorobenzene , ,55 57, , , , , , , App ID min
12 Figure 6. Characterization of Crude Oil Sample using the Zebron ZB-1XT SimDist Column Column: Zebron ZB-1XT SimDist Dimensions: 5 meter x 0.53 mm x 0.09 µm Part No.: 7AK-G Injection: 38 C, 1 µl Carrier Gas: 15 ml/min (constant flow) Oven Program: 35 C to C/min for 20 min Detector: 450 C Sample: Yeates Crude Oil Note: Sample is 1 % in CS2 and baseline subtracted. App ID min
13 Figure 7. Fast Analysis of PAH Isomers using Zebron ZB-5ms Column: Zebron ZB-5ms Dimensions: 20 meters x 0.18 mm x 0.18 μm Part No.: 7FD-G Injection: Split 285 C, 1 μl Carrier Gas: 1.2 ml/min (constant flow) Oven Program: 130 C for 0.5 min to C/min to C/min to C/min for 4 min Detector: MSD; amu 10 Sample: Naphthalene 2. 2-Methylnaphthalene 3. Acenaphthalene 4. Acenaphthene 5. Fluorene 6. Phenanthrene 7. Anthracene 8. Fluoranthene 9. Pyrene Note: Samples were 50 ppm in Dichloromethane Benzo[a]anthracene 11. Chrysene 12. Benzo[b]fluoranthene 13. Benzo[k]fluoranthene 14. Benzo[a]pyrene 15. Indeno[1,2,3-cd]pyrene 16. Dibenz[a,h]anthracene 17. Benzo[g,h,i]perylene App ID min
14 Figure 8. HPLC Analysis of PAHs using Kinetex Core-Shell C Column: Kinetex 2.6 µm C18 Dimensions: 100 x 4.6 mm Part No.: 00D-4462-E0 Mobile Phase: A: Water B. Acetonitrile Gradient: (30:70) A/B to (0:100) A/B over 10 min Flow Rate: 1.5 ml/min Temperature: 30 C App ID Detection: 254 nm Sample: 1. Naphthalene 2. Acenaphthylene 3. Fluorene 4. Acenaphthene 5. Phenanthrene 6. Anthracene 7. Fluoranthene 8. Pyrene 9. Chrysene 10. Benzo[a]anthracene 11. Benzo[b]fluoranthene 12. Benzo[k]fluoranthene 13. Benzo[a]pyrene 14. Dibenzo[a,h]anthracene 15. Indeno[1,2,3-cd]pyrene 16. Benzo[g,h,i]perylene min
15 Conclusions Due to the magnitude of the Gulf Oil spill, the cleanup will be on-going for many years and there is not one specific technique that can be applied to all samples. We have presented here just a few of the solutions that are available. Additional solutions are being developed every day for other chemicals, such as dispersants, used in the cleanup process. For more information about these and other solutions available, please visit: www. phenomenex.com.
16 References 1. U.S. Scientific Teams Refine Estimates of Oil Flow from BP s Well Prior to Capping, RestoreTheGulf.Gov, August 02, Analysis: Gulf leak may be harsher type of oil, T. Maugh II, Los Angeles Times, May 01, 2010, 3. Extraction, Cleanup, and Gas Chromatography/Mass Spectrometry Analysis of Sediments and Tissues for Organic Contaminants, U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration, March QUALITY ASSURANCE SAMPLING PLAN FOR BRITISH PETROLEUM OIL SPILL, U.S. Environmental Protection Agency, May EPA Method 8015B NONHALOGENATED ORGANICS USING GC/FID, Environmental Protection Agency, Revision 2, 1996 Trademarks Strata and Kinetex are registered trademarks of Phenomenex Inc. Zebron and EnviroSep are trademarks of Phenomenex, Inc Phenomenex, Inc. All rights reserved.
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