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Modified EPA Method 8260 for the Analysis of Crude Oils by Purgepurge--Andand--Traptrap GCGC--MS.MS

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Modified EPA Method 8260 for the Analysis of Crude Oils by Purgepurge--Andand--Traptrap GCGC--MS.MS BP Gulf Oil Spill: Modified EPA Method 8260 for the Analysis of Crude Oils by PurgePurge--andand--TrapTrap GCGC--MS.MS. C. English, J. Konschnik, J. Cochran, M. Misselwitz, R. Lautamo, and G. Stidsen Restek Corporation, 110 Benner Circle, Bellefonte, PA 16823 1 Typical Crude Oil Analysis Inj………………..COC (oven track) Det……...............FID @ 330 C Oven……………50 > 300 @ 10/min > hold > 20 min Carrier gas……..H2 @ 40cm/sec MU………………30 mls/min N2 Sample…………. Light Crude Oil W / C10-40 overlay Conc……………. 500 PPM C10 Sample size…… 1ul C40 0 102030 Time (min) 2 TtCTarget Compoun ds 1 1,4-Difluorobenzene 17 n-octane 2 isobutane 18 ethylbenzene 3 n-butane 19 m/p-xylene 4 2-methylbutane 20 n-nonane 5 pentane 21 o-xylene 6 2-methylpentane 22 isopropylbenzene 7 3-methylpentane 23 n-propylbenzene 24 n-decane 8 hexane 25 sec-butylbenzene 9 methylcyclopentane 26 n-butylcyclohexane 10 cyclohexane 27 p-isopropyltoluene 11 benzene 28 n-butylbenzene 12 2,2,4-trimethylhexane 29 n-dodecane 13 heptane 30 naphthalene 14 methylcyclohexane 31 2-methylnaphthalene 16 toluene 32 1-methylnaphthalene 253 2 . 53 isobutane 2.79 n‐butane Oven: Rxi 3.71 ‐ 2‐methylbutane 4.22 624Sil pentane 35C(hold MS 6.25 2‐methylpentane 9.59 30m 6.73 isooctane 5min) 3‐methylpentane 7.24 hexane 9.76 x heptane 0.25mm 8.21 11C/60C methylcyclopentane 9.09 TIC: cyclohexane 9.42 9.75 benzene D10081026.D\data.ms x fluorobenzene 10.37 1.4df, (0 methylcyclohexane hold) 11.36 1ml/min, toluene 11.46 20C/320C octane 12.66 12.57 ethylbenzene chlorobenzene‐d5 13.08 m/p‐xylene / nonane 12.76 o‐xylene 13 53 45C 4‐bromofluorobenzene . 53 14.15 (hold 14.47 heated 1,4‐dichlorobenzene‐d4 15.61 1) n‐dodecane 16.26 5ml naphthalene purge 13.37 2‐methylnaphthalene Isopropylbenzene 1‐methylnaphthalene 17.28 13.71 n‐propylbenzene 13.82 n‐decane 13.85 1,3,5‐trimethylbenzene 14.11 t‐butylbenzene 14 16 . 1,2,4‐trimethylbenzene 16 14.28 sec‐butylbenzene 14.36 n‐butylcyclohexane p‐isoproyltoluene 14.40 14.72 n‐butylbenzene Crude Oil Chromatogram at 10 ppm toluene m/p-xylene isobutane o-xylene benzene butane zene nn e-be 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 Crude Oil Chromatogram at 10 ppm 43. 1 Isobutane Found in all samples BP -11C 41.1 Isobutane 39.0 57.0 37.1 45.0 51.1 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 Study: • Salt water vs. fresh water • Dispersed oil vs. nonnon--diperseddipersed oil • Feasibility of detecting ppb levels of total crude Require ppt levels of single analytes • Comparison of WAFs of different crude oils Mississippi Canyon, Maya & California Salt Water vs. Fresh Water Purge Fresh Water vs. Salt Water Analysis 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 Curve e sit Points nk o mp mposite 1, 10, 50, e o b BTEX n ne MC252 MC252 d Bla Co li C li pp o o o m m e 100, 200 h m s m de d a pp as ru 100 Met 1pp G 1 G 10ppCru 10ppC Target Compound Salt Salt Fresh Salt Fresh Salt 1,4-difluorobenzene %RSD %Rec. 22methyl-methyl pentane 8% ND 44.2 43.9 66.8 63.2 benzene 9% 107% ND 12.6 13.0 22.2 22.1 2,2,4-trimethylpentane 10% ND 28.1 27.7 0.0 0.0 n-heptane 10% ND 12.8 11.1 132.6 121.2 toluene 10% 106% ND 98.0 101.9 63.2 61.3 ethylbenzene 11% 109% ND 21. 2 22. 2 13. 5 13. 8 m/p-xylene 12% 109% ND 77.7 81.5 70.1 68.0 o-xylene 12% 109% ND 31.5 32.8 25.4 25.6 1,2,4-trimethylbenzene 16% ND 35.9 36.7 33.5 33.1 naphthalene 21% ND 1.9 2.1 9.7 11.2 bflbbromofluorobenzene 12% 110% 106. 8% 102. 4% 100. 3% 96. 1% 89. 1% Curve: D100818 Dispersed Oil vs. NonNon--DispersedDispersed Oil Dispersed Oil vs. NonNon--DispersedDispersed Oil 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 de rude ru Points: X k C C 2 an 52 0.5, 10, 50, TE l 2 25 B B C C nt Added b sa 100, 200 p d M M r p tho pm pm 00 e 0p 0p Dispe 1 M 1 1 Target Compound Salt Salt Salt Salt 1,4-difluorobenzene (IS) %RSD %Rec. ppb ppb 2hl2-methyl pentane 10% ND 5101.0 63. 2 benzene 5% 119% ND 19.9 22.1 2,2,4-trimethylpentane 5% ND 0.0 0.0 n-heptane 11% ND 99.3 118.3 toluene 3% 114% ND 58.2 69.5 ethy lbenzene 13% 121% ND 13. 0 15. 3 m/p-xylene 11% 125% ND 67.7 87.1 o-xylene 10% 111% ND 24.7 30.5 1,2,4-trimethylbenzene 13% ND 30.6 40.2 naphthalene 20% ND 9.8 12.2 bromofluorobenzene 7% 110% 107. 1% 92. 1% 95. 8% curve: D100819 P&TP&T--GC/MSGC/MS--SIMSIM P&TP&T--GC/MSGC/MS--SIM:SIM: toluene, ethylbenzene, m, p, o, xylene Detection of TEX crude volatiles to 100 ppb total crude Bt10tBenzene at 10 ppt • calibration: 50, 100, 500, 1000, 2000 ppt • benzene did not pass calibration • toluene Low Point 100ppt (background ~ 75 ppt) • e-benzene low point 50ppt • m/p xylene Low Point 100ppt • o-xylene Low Point 50ppt SIM: toluene, ethylbenzene, m, p, o, xylene Recoveries of volatiles in 100ppb total crude. Target Compound 1,4-difluorobenzene (IS) %RSD %Rec. ppt ppt ppt toluene** ethylbenzene m/p-xylene o-xylene bromofluorobenzene Points: 50, ** 50 ppt point dropped. 100 500 BFB m/z 95 1000, 2000 , 500 ppt. , 12% 8% 10% 8% 100 ppt BTEX 10% 121% ND 574.2 544.8 355.1 99% ND 119.9Metho 121.2d Bla 116.7nk 102% ND 322.3 324.7 170.0 112% ND 238.2 238.2 138.2 82% 106% 122.9% 124.2% 103.8% 100ppb MC252 Crude 100ppb MC252 Crude Rep 100ppb Maya Crude Comparison Between SIM & Full Scan 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 TtCdT arge 1,4-difluorobenzene (IS) ppb ppb ppb ppb benzenet 2.56 2.40 C tolueneompoun 7.45 6.98 5.50 5.47 ethylbenzene 1.51 1.38 1.06 1.19 m/p-xylene 8.40 7.66 6.00 6.44 o-xylene 3.00 2.68 2.20 2.38 d bromofluorobenzene 104% 93.4% 142.5% 122.9% 1ppm MC252 Crude Curve#2 1ppm MC252 Crude Curve#3 500ppb (x2) MC252 Sim Curve#5 100ppb (x10) MC252 Sim Curve #6 Comparisons of MC252, Maya and California Crude Oil 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 e rud e C rude d a Points: C rni 52 a Cru 0.5,,,, 10, 50, lank 2 lifo B C ay a 100, 200 C pm p 0ppm M 0 Method 1 10ppm M 1 Target Compound 1,4-difluorobenzene (IS) %RSD ppb ppb ppb 2-methyl pentane 10% ND 51.0 22.6 12.0 benzene 5% ND 19.9 5.5 3.2 2,2,4-trimethylpentane 5% ND 0.0 0.0 5.6 n-heptane 11% ND 99.3 35.6 3.7 toluene 3% ND 58.2 16.6 20.6 ethylbenzene 13% ND 13. 0 535.3 464.6 m/p-xylene 11% ND 67.7 16.2 16.1 o-xylene 10% ND 24.7 6.9 6.4 1,2,4-trimethylbenzene 13% ND 30.6 7.8 7.0 naphthalene 20% ND 9.8 1.1 0.5 bromofluorobenzene 7% 107.1% 92.1% 110.4% 100.8% Analytical Challenges • Salt Clogging Autosamplers • Making up standards • Background BTEX limits this method • Proper choice of SS & IS is critical Observations • Salt water vs. fresh water • Dispersed oil vs. nonnon--diperseddipersed oil • Total crude detected at 100 ppb • Crude showed measurable differences • Butanes present in all crudes Questions ? .
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