Document 0qxeBknY2KpEV9jeDLQZMyr1J
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AR226-2617
2003-DuET-??
DRAFT
AR226-2617
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DuPont Engineering Technologies Wastewater Group Brandywine DuPont Company
Validation of Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS) For Analysis of Perfluorooctanoic Acid (PFOA) In Samples From Chambers Works Wastewater Treatment
Facility
Final Report
W ork Done By:
Report Written By: Previous Related Reports: Project Code: Period Covered: Notebook Numbers: Date of Issue: Reviewed by:
Approved by:
Stephen Constable, Lynn DeKleva, Barbara Larsen, Stan Bachmura, R. K. Bell, Mark Richmond Stephen Constable, Lynn Dekleva, Barbara Larsen
06/2003-09/2003
E93384FC
10/15/03
Maria Angelo, Mark Richmond, Irene Legeic, Bob Reich, Paul
Jann, Charlie Zarzecki, Steve Breske, Bill Berti, John Gannon,
Mary Kaiser, Carl Camp
N/A
DRAFT
Information in this report is proprietary and should be handled according to the designated Proprietary Information Protection (PIP) classification listed below.
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Abstract : A liquid chromatography tandem mass spectrometry analytical technique was
used for analysis o f perflurooctanoic acid (PFOA) in groundwater and surface waters. This report describes the results o f analyses o f PFOA in distilled water, salt spiked water and primary clarifier effluent from the Chambers Works (CW) wastewater treatment system.
Keywords high performance liquid chromatography tandem mass spectrometry
(LC/MS/MS), perfluorooctanoic acid (PFOA), Chambers Works Secure Environmental Treatment, C8, FC-143, biological treatment, powdered activated carbon treatment (PACT), activated carbon, primary clarification
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Table O f Contents
Introduction and Objectives.............................................................................................................................3
Summary and Conclusions.................................................................................................................................3 The method validation study demonstrates that the LC/MS/MS analytical technique can be
USEDTO MEASUREPFOA INTHECOMPLEXWASTEWATERMATRIXFOUND INTHE CW SET SYSTEM.
M ethanol shows promise as an extractant for PFOA that is adsorbed to suspended solids found
in the primary clarification and biological treatment system at Chambers Works. The
METHANOLEXTRACTION METHODWILLREQUIREFURTHERDEVELOPMENT.......................................................... 3
Patent Situation.................................................................................................................................
3
Program.................................................................................................................................................................. 3
Publication Status............................................................................................................................................... 3
Personnel................................................................................................................................................................ 3
Safety and Waste Disposal.................................................................................................................................4
Tt* ^
Environmental Considerations
Signatures......................................
Experimental.......................................................................................................................................................... 5
Discussion of Results........................................................................................................................................... 6
References...............................................................................................................................................................8
APPENDICES....................................................................................................................................................9
Appendix A: Suggested Protocol For Sampling Appenddc B: Liquid Chromatography with Tandem Mass Spectrometry for Perfluorooctanoic
Acid (PFOA) Quantitation Appendix C: Method Validation and Extraction Testing Results
DISTRIBUTION FOR COMPANY PROGRESS REPORTS.....................................................................10
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Validation o f Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS) For Analysis o f
Perfluorooctanoic Acid (PFOA) In Samples From Chambers Works Wastewater Treatment Facility
Final report
Introduction and Objectives
PFOA is a compound that is used for the production o f fluoropolymers. PFOA containing wastewaters are discharged to the Chambers Works (CW) site wastewater treatment system, which is operated by Secure Environmental Treatment (SET). A liquid chromatography tandem mass spectrometry (LC/MS/MS) analytical technique was used for analysis o f PFOA in groundwater and surface waters. This work evaluated the efficacy of this analytical technique for determining PFOA concentrations in distilled water, a synthetic wastewater matrix and a sample from the CW treatment system. In addition, a preliminarily methanol extraction o f PFOA adsorbed to suspended solids was investigated in CW samples.
Summary and Conclusions
The method validation study demonstrates that the LC/MS/MS analytical technique can be used to measure PFOA in the complex wastewater matrix found in the CW SET system. Methanol shows promise as an extractant for PFOA that is adsorbed to suspended solids found in the primary clarification and biological treatment system at Chambers Works. The methanol extraction method will require further development.
Patent Situation
N/A
Program
The program is described elsewhere below.
Publication Status
N/A
Personnel
Name(s)
Location(s) [Enter PIP Class]
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Stephen Constable Lynn DeKleva Barbara Larsen R. K. Beil Mark Richmond Stan Bachmura
B9248 G300/208 E228/120A DCSE-CW DCSE-CW E228/141
Safety and Waste Disposal
All analytical wastes will be returned to submitter
Environmental Considerations
N/A
Signatures
Signature(s) of the author(s) should appear here.
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Experimental
Test Substance Name: Synonyms:
Active substance:
CAS Name:
CAS Number: Supplier:
Product Number: Lot Number: Molecular Formula: Formula Weight: Concentration o f a.s., nominal: Certificate o f Analysis Date: Solubility: Appearance:
Ammonium perfluorooctanoate Ammonium pentadecafluorooctanoate; Ammonium perfluorocaprylate; DS 101; Fluorad FC 143; Perflurorooctanoic acid ammonium salt; Unidyne DS 101 Octanoie acid, pentadecafluoro-, ammonium salt Octanoie acid, pentadecafluoro-, ammonium salt 3825-26-1 Fluka Chemical Company 1001 West St. Paul Milwaukee, WI 53233 USA 77262 421207/1 24501
C 8H 4F 15N 0 2 431.1 g/mole
> 98.0% 24-Jan-01 0.1 g/ml White Powder
Reagents and Solvents
All chemicals and solvents were of reagent grade or purer and were purchased from the following suppliers: Calcium chloride dihydrate (Mallinckrodt); Sodium sulfate (Baker); Sodium hydroxide (Ricca Chemical); Hydrochloric acid (Baker) Methanol used for extractions (Burdick & Jackson), Methanol HPLC grade (EM Science), and Ammonium Acetate ACS grade (EM Science).
Test Materials
Samples o f primary clarifier underflow, primary clarifier effluent, secondary aeration mixed liquor suspended solid (MLSS) and tertiary MLSS samples, and virgin powdered activated carbon (PAC) were used in the study. The primary clarifier underflow sample from primary
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clarifier CF-64 and the MLSS samples from Spot 627 (secondary treatment) and Spot 628 (tertiary treatment) were grab samples collected on May 27,2003 and refrigerated until use. The Primary clarifier effluent (CF-64) was a 24-hr composite sample collected from 529 spot on May 29,2003 and refrigerated until use. The virgin Powdered Activated Carbon (PAC Calgon WPX-D) was obtained from DuPont Secure Environmental Treatment (SET) and was stored at room temperature. All samples were collected in accordance with the principles explained in Appendix A.
Test solutions were prepared as follows:
The salt solution was prepared by dissolving calcium chloride (1400mg/L) and sodium sulfate (1250 mg/L) in deionized water. Hydrochloric acid and/or sodium hydroxide were used to adjust the final pH o f the solution to 7.0-7.8
The primary clarifier effluent was centrifuged for 10 minutes at 6000 RPM (Sorvall RC-5 HS-4 Rotor) and supernatants filtered (Pall Gelman 4190) prior to use.
A mixed MLSS sample was prepared by combining secondary and tertiary MLSS samples at a ratio of 3 parts secondary: 1 part tertiary
Analytical
The total solids and total suspended solids of the primary underflow and MLSS samples were determined according to methods 2540B or 2540D, as appropriate and as outlined in Standard Methods for the Examination o f Water and Wastewater, 20th Edition (1998), American Public Health Association, Washington, DC. PFOA was analyzed by LC/MS/MS in accordance with the methodology shown in Appendix B.
Experimental Protocol: Stock solutions were prepared in deionized water and stored at room temperature. Solutions of the test compound were prepared from the stock solution in deionized water, salt solution, and primary clarifier effluent at test concentrations o f 0 ,1 0 ,1 0 0 and 1000 ug/L. The samples were filtered, diluted (if required), and submitted for analysis.
The supernatant fractions of centrifuged primary solids and MLSS samples were filtered and analyzed for the test compound. The solid fraction was extracted by sonicating with methanol for 1 hour. Additional solid fractions were spiked with 100 and 500 ug/L o f the test compound and immediately thereafter extracted by sonicating with methanol for 1 hour. Methanol extracts were centrifuged, filtered, diluted (if required) and submitted for analysis.
Discussion of Results
All analytical data are included in Appendix C. Method validation and extraction results are discussed separately below.
A. M ethod Validation: The candidate aqueous test matrices for method validation included deionized water solution, salt solution and primary clarifier effluent. Table 1 summarizes the results o f the sample analyses.
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Table I Results of Method Validation
Nominal PFOA (ug/L)
Deionized W ater Samples PFOA
(ug/L)
Salt Solution PFOA (ug/L)
1,000 100 10 0
1,030 103 15.2 <LOQ
1,090 103 13.6 <LOQ
Filtered Primary Effluent PFOA M easured/Expected
(ug/L) 1,500/1280
150/198 88 /90.4
78/0
The test matrices were chosen to evaluate method efficacy in increasingly complex matrices. Deionized water solution was used in order to determine analytical capabilities in a clean background matrix while the salt solution simulates the major ionic components of the CW SET treatment effluent. The primary clarifier effluent represents the most complex wastewater matrix, composed of inorganics and a variety o f organic compounds.
The difference between the results for deionized water and salt solution are within the accuracy o f the analytical measurement. The expected PFOA concentration in the filtered primary effluent differs from measured due to background concentrations and dilution. The results show that the salt has no impact on the analytical results and that PFOA is present in the primary clarifier system. Increasing the complexity o f the test matrix does not appear to interfere with the ability o f the analytical method to detect the compound with a reasonable degree o f accuracy. For test expediency only single preparations were made for each sample represented in Table 1. Further experiments would define the statistical accuracy in this matrix.
B. M ethanol Extraction of PFOA All analytical data are included in Appendix C. The extraction testing used samples taken from the primary clarifer underflow (primary solids) and the secondary and tertiary mixed liquor suspended solids (MLSS). Secondary and tertiary mixed liquor samples were combined at a ratio o f 3:1 (mixed MLSS) to simulate the ratio o f tertiary to secondary solids in the CW system. A sample of PAC was also used.
Table II Methanol Extraction from Solids
Total PFOA m icrogram s Added
25 5
PAC
0.34 0.04
Total PFOA micrograms recovered
Prim ary Solids
Secondary MLSS
Tertiary MLSS
50.6 24.9 25.3 25.1 8.2 7.4
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Mixed MLSS
25.0 8.6
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0
<LOQ
6.6
2.7
1.9
5.2
Total
Suspended
Solids gm/L
N/A
140 11.0
8.1
11.9
Solid Test Weight gm
4.3
7.0 0.56 0.4
0.6
The results from the preliminary extraction experiments o f the MLSS samples show recoveries o f 68% and 110% o f the test compound (Table II) with extraction solids weights ranging from 0.4-0.6 grams. The recovery for the primary solids, which were tested at a significantly higher weight (7 grams), ranged from 176% to 369%. Less than 1% was recovered from the PAC samples, which also were tested at high solids weight. These results indicate that extraction with high solid weight samples require additional extraction steps and/or higher extraction volumes. However, optimization o f the extraction was beyond the scope o f these investigations.
References
N/A
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X
Appendices
Appendix A: Suggested Protocol For Sampling Appendix B: Liquid Chromatography with Tandem Mass Spectrometry for Perfiuorooctanoic Acid (PFOA) Quantitation Appendix C: Method Validation and Extraction Testing Results
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Distribution for Company Progress Reports
Copy of Reports Sent To: Authors): Additional recipients: Documentation Clerk:
Director(s): Associate Directors): Supervisor(s): Manager(s): Manager-Patent Section: CR&D Technical Records Center:
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APPENDIX A: SUGGESTED PROTOCOL FOR SAMPLING
The following is a suggested protocol for sample collection. Sample bottles should not be pre rinsed in the field prior to sample collection. Gloves should be worn during sampling activities and replaced between samples. A ll samples should be held at a nominal 4C (not frozen to 6C) with wet ice from collection to shipping. Sampling equipment may include stainless steel mixing bowls, trowels, and spoons. A ll o f these items w ill come in direct contact with the sample and have potential to impact analytical results. Therefore, care should be taken to ensure the cleanliness o f all sampling equipment. When possible, pre-cleaned or disposable sampling equipment should be used. Field decontamination may be permitted, provided the following method is applied:
0 Wipe o ff any residual sludge or water with a Chem-wipeTM. 0 Rinse the equipment with deionized water. 0 Rinse the equipment with methanol. 0 Place in zip-sealed bag until next use In addition to the decontamination procedures outlined above, the person collecting the sample should wear clean latex or nitrile disposable lab or exam gloves and should lim it his/her contact with the samples. Sample bottles should not be cleaned in the field. In order to minimize the possibility o f introducing PFOA contamination into samples, the following protocol should be followed: 0 Avoid polytetrafluoroethylene (PTFE). 0 Avoid aluminum foil. 0 Do not use self-stick memo notes. 0 Avoid blue ice. 0 Avoid pre-wrapped foods or snacks. 0 Wear clothing that has been washed at least six times. 0 U se only containers supplied by contract laboratory. Samples should be transferred to collection bottles. Sam ples should be collected and shipped to the designated laboratory follow in g standard ch ain -of custody procedures.
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Appendix B
Liquid Chromatography and Liquid Chromatography Tandem Mass Spectrometry for Perfluorooctanoaic Acid
(PFOA) Quantitation
For the rail car grab samples, Perfluorooctanoaic acid (PFOA) was quantitated by liquid chromatography (LC) at Parkersburg lab. PFOA was quantitated in all other samples by the CCAS lab at die Experimental Station using LC combined with tandem mass spectrometry (MS/MS). Both techniques are described below
I. Liquid Chromatosravhv (LC):
Perfluorooctanoaic acid (PFOA) was quantitated by liquid chromatography (LC) at Parkersburg lab in accordance with the following:
Instrument Detector Column
Agilent 1150 U V @ 2 1 0 n m (Diode Array) Zorbax XDB-C18 (Reverse Phase)
Mobile Phase Flow Rate Sample Size Detection Limit
40/60 Acetonitrile/Water + 0.1% Perchloric Acid 0.4 ml/min 1 -1 0 0 microliters (concentration dependant) 1 ppm
I I Liquid Chromatosravhv (LC) combined with tandem mass spectrometry (MS/MS):
Perfluorooctanoaic acid (PFOA) was quantitated by liquid chromatography (LC) (Agilent 1100 Liquid Chromatograph) combined with tandem mass spectrometry (MS/MS) (Micromass Quatro Ultima). Negative ion electrospray was used to produce the molecular anion for the perfluorooctanoic acid, which was then subjected to collisioninduced dissociation producing the decarboxylated anion. The MS/MS transition was specific to perfluorooctanoic acid and the area o f the chromatogram was proportional to the concentration o f PFOA.
The standard operating conditions for the method are provided below. Samples were submitted in polystyrene conical bottom tubes which were refrigerated prior to analysis. The samples were diluted (if required) with the appropriate diluent and transferred to polypropylene vials (Agilent 5182-0567) sealed with a natural rubber crimp seal (Agilent 5182-1210).
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Appendix B
Samples were analysed by duplicate injections and quantified using a calibration curve generated the day o f analysis. Sample concentrations were reported at or above the limit o f quantitation (LOQ) for this study.
LC Conditions
W ater Samples
The LC column (Waters Symmetry Cis 5 pm 2.1x50 mm part# 186000206) is equilibrated with 100% Solvent A (1% Methanol in 2mM Ammonium Acetate) and Solvent B (100% Methanol). The method utilizes a linear gradient with the following conditions:
Time Solvent B F'
(min) % (ml/min)
0 0 0.25
5 0 0.25
10 100 0.25
14 100 0.25
15 0
0.25
17 0
0.25
The flow is diverted to waste between 0-5 minutes and directed to the mass spectrometer between 5 to 18.9 minutes. The injection volume is 25 microliters.
Methanol Extracts The LC column (Agilent Spherisorb ODS 5 pm 2.1x150 part #779160D-572) is equilibrated with 80% Solvent A (1% Methanol in 2mM Ammonium Acetate) and 20% Solvent B (100% Methanol). The method utilizes a linear gradient with the following conditions:
Time Solvent B Flow
(min) % (ml/min)
0 20 0.25
17 67 0.25
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17.01 20 20 20
0.25 0.25
Appendix B
No flow is diverter is used for this method. The injection volume is 25 microliters.
MS Conditions The mass spectrometer is optimized for the molecular anion at 413 m/z with the Capillary Voltage set at 2.6 kV, Cone Voltage set at 10V, the source block temperature is set at
125C and desolvation temperature is set at 250C. The collision cell is maintained at a pressure o f argon 1.0 E-3 and nitrogen flow is maintained at 100 psi. The mass spectrometer monitors the transition 413 > 369.
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