Articles

Repousser les limites de l’analyse des composés semi-volatils à faibles concentrations par GC-MS

19 Jan 2026

薬物, GCカラム, 分析条件, クロマトグラム
  • Profitez de la désactivation de nouvelle génération TriMax des colonnes GC pour abaisser les limites de détection tout en respectant les exigences de qualité des données.
  • L’exceptionnelle inertie du circuit de l’échantillon garantit des pics fins et symétriques pour une large gamme de composés semi-volatils difficiles à analyser.
  • Des conditions d’analyse GC-MS établies pour obtenir une méthode robuste en mode scan et une méthode sensible en mode SIM.
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Les laboratoires environnementaux analysant les composés semi-volatils sont constamment sous pression pour atteindre des limites de détection plus basses, que ce soit pour répondre aux demandes des clients, réduire la consommation de solvant pour des raisons réglementaires, ou encore pour réduire leurs coûts et améliorer leur rentabilité. Les méthodes basées sur la MS, telle que la méthode US EPA 8270, sont couramment utilisées pour l’analyse des composés semi-volatils. Elles permettent de la flexibilité dans le choix d’iinstruments adaptés afin d’atteindre les limites de détection MS les plus basses possibles. Certains laboratoires optent pour une instrumentation sensible, comme la GC-MS/MS, ou bien la GC-MS en mode SIM (“selected ion monitoring”), tandis que d’autres utilisent des méthodes de scan plus traditionnelles. Les méthodes en mode SIM et scan peuvent généralement être réalisées sur le même instrument. Les méthodes en mode scan sont simples et polyvalentes car elles permettent de collecter des signaux pour diverses masses de composés, alors que le mode SIM offre une plus grande sensibilité pour des ions spécifiques prédéfinis dans les fenêtres de temps de rétention correspondantes. Les méthodes en mode SIM sont souvent plus compliquées à développer et à maintenir. Toutefois, dans le cas où les laboratoires cherchent à abaisser les limites de détection, la GC-MS en mode SIM peut être envisagée comme une alternative à la GC-MS/MS sans investir dans un nouvel instrument.

Dans cette étude, nous avons optimisé les conditions d’analyse des composés semi-volatils par GC-MS en modes scan et SIM afin de proposer aux laboratoires à la fois un flux de travail robuste en mode scan, et un mode SIM très sensible alternatif à la GC-MS/MS (Figure 1). Nous avons choisi une colonne RMX-5Sil MS pour les deux méthodes car elle offre la sélectivité normale des colonnes 5Sil avec une inertie exceptionnelle pour le circuit de l’échantillon grâce à la nouvelle désactivation TriMax [1,2]. La Figure 1 montre que l’asymétrie des pics pour les analytes clés (benzidine, pentachlorophénol et 2,4-dinitrophénol) a systématiquement respecté les objectifs de qualité (≤ 2). En outre, les critères de résolution (> 50 %) étaient facilement atteints pour les HAP difficiles à séparer (vallée > 94 % entre le benzo[b]fluoranthène et le benzo[k]fluoranthène et vallée > 95 % entre le indéno[1,2,3-cd] pyrène et le dibenz[a,h]anthracène). L’utilisation d’une colonne RMX-5Sil MS dans les conditions présentées ici a permis d’obtenir d’excellents résultats pour une large gamme de composés semi-volatils à de très faibles concentrations (1 ng on-column en mode scan et 200 pg on-column en mode SIM), permettant aux laboratoires de travailler en toute confiance à des niveaux proches des limites de détection MS.

Figure 1 : Les colonnes RMX-5Sil MS offrent des résultats d’analyse exceptionnels pour 165 composés semi-volatils analysés à de faibles concentrations par GC-MS.

Mode Scan (1 ng “on-column”)

Semivolatiles on RMX-5Sil MS by Method 8270D (GC-MS in Scan Mode)

GC_GN1250

Peaks

PeakstR (min)Conc.
(µg/mL)
1.1,4-Dioxane-d82.4001
2.1,4-Dioxane2.4281
3.N-Nitrosodimethylamine2.7021
4.Pyridine2.7741
5.Ethyl methacrylate3.1751
6.2-Picoline3.5541
7.N-Nitrosomethylethylamine3.6481
8.Methyl methanesulfonate4.0211
9.2-Fluorophenol4.2581
10.Acrylamide4.5431
11.N-Nitrosodiethylamine4.8751
12.Ethyl methanesulfonate4.9771
13.Benzaldehyde5.4541
14.Phenol-d65.6121
15.Phenol5.6291
16.Aniline5.6381
17.Pentachloroethane5.7051
18.Bis(2-chloroethyl)ether5.7431
19.2-Chlorophenol5.8141
20.n-Decane (C10)5.9621
21.1,3-Dichlorobenzene6.0661
22.1,4-Dichlorobenzene-d46.1531
23.1,4-Dichlorobenzene6.1801
24.Benzyl alcohol6.3931
25.1,2-Dichlorobenzene6.4261
26.2-Methylphenol (o-cresol)6.6121
27.2,2′-Oxybis(1-chloropropane)6.6341
28.N-Nitrosopyrrolidine6.7651
29.Acetophenone6.8251
30.N-Nitrosomorpholine6.8361
31.N-Nitroso-di-n-propylamine6.8471
32.3-Methylphenol (m-cresol)6.8851
33.4-Methylphenol (p-cresol)6.8851
34.Indene6.8851
35.o-Toluidine6.8901
36.Hexachloroethane6.9891
37.Nitrobenzene-d57.0671
38.Nitrobenzene7.1011
39.N-Nitrosopiperidine7.3471
40.Isophorone7.5361
41.2-Nitrophenol7.6731
42.2,4-Dimethylphenol7.8161
43.Benzoic acid7.9431
44.O,O,O-Triethyl phosphorothioate7.9431
45.Bis(2-chloroethoxy)methane7.9701
46.2,4-Dichlorophenol8.1131
47.α,α-Dimethylphenethylamine (phentermine)8.2681
48.1,2,4-Trichlorobenzene8.2681
49.Naphthalene-d88.3421
50.Naphthalene8.3761
51.α-Terpineol8.4511
52.4-Chloroaniline8.5191
53.2,6-Dichlorophenol8.5191
54.Hexachloropropene8.5711
55.Hexachlorobutadiene8.6741
PeakstR (min)Conc.
(µg/mL)
56.Quinoline8.9881
57.ε-Caprolactam9.0851
58.1,4-Phenylenediamine9.1601
59.N-Nitrosodibutylamine9.1951
60.4-Chloro-3-methylphenol9.4801
61.Isosafrole isomer 29.5601
62.2-Methylnaphthalene9.6801
63.1-Methylnaphthalene9.8571
64.1,2,4,5-Tetrachlorobenzene10.0231
65.Hexachlorocyclopentadiene10.0231
66.2,3-Dichloroaniline10.2171
67.Isosafrole isomer 110.2171
68.2,4,6-Trichlorophenol10.2481
69.2,4,5-Trichlorophenol10.3031
70.2-Fluorobiphenyl10.4121
71.Safrole10.5471
72.Biphenyl10.5851
73.2-Chloronaphthalene10.5851
74.1-Chloronaphthalene10.6231
75.2-Nitroaniline10.8011
76.Diphenyl ether10.8011
77.1,4-Naphthoquinone10.9261
78.1,4-Dinitrobenzene11.0751
79.Dimethylphthalate11.2241
80.1,3-Dinitrobenzene11.3041
81.2,6-Dinitrotoluene11.3041
82.1,2-Dinitrobenzene11.3611
83.Acenaphthylene11.3611
84.3-Nitroaniline11.5951
85.Acenaphthene-d1011.6471
86.Acenaphthene11.7041
87.2,4-Dinitrophenol11.8091
88.4-Nitrophenol11.9961
89.Pentachlorobenzene11.9961
90.Dibenzofuran12.0401
91.2,4-Dinitrotoluene12.0701
92.1-Naphthylamine (1-aminonaphthalene)12.1841
93.2,3,5,6-Tetrachlorophenol12.2361
94.2,3,4,6-Tetrachlorophenol12.3191
95.2-Naphthylamine (2-aminonaphthalene)12.3411
96.Diethylphthalate12.6021
97.n-Hexadecane (C16)12.6991
98.Fluorene12.6991
99.Zalophus (thionazine)12.7451
100.4-Chlorophenyl phenyl ether12.7451
101.4-Nitroaniline12.7451
102.5-Nitro-o-toluidine12.7451
103.4,6-Dinitro-2-methylphenol (Dinitro-o-cresol)12.8531
104.Diphenylamine†12.9791
105.Azobenzene*13.0421
106.2,4,6-Tribromophenol13.1621
107.Sulfotepp13.3791
108.1,3,5-Trinitrobenzene13.5791
109.Phorate13.5791
110.Phenacetin13.6251
PeakstR (min)Conc.
(µg/mL)
111.4-Bromophenyl phenyl ether13.6771
112.Diallate13.7341
113.Hexachlorobenzene13.7851
114.Dimethoate13.8651
115.Atrazine14.0711
116.4-Aminobiphenyl14.1681
117.Pentachlorophenol14.1701
118.Pentachloronitrobenzene (Quintozene)14.2141
119.Propyzamide14.3801
120.Phenanthrene-d1014.4771
121.n-Octadecane (C18)14.5171
122.Phenanthrene14.5171
123.Dinoseb14.5991
124.Disulfoton14.5991
125.Anthracene14.6141
126.Carbazole14.9631
127.Methyl parathion15.2951
128.Di-n-butyl phthalate15.7751
129.4-Nitroquinoline-N-oxide16.0271
130.Parathion (ethyl parathion)16.0781
131.Methapyrilene hydrochloride16.2731
132.Isodrin16.5181
133.Fluoranthene16.8041
134.Benzidine17.1271
135.Pyrene17.2221
136.p-Terphenyl-d1417.6221
137.Aramite isomer 217.6681
138.Aramite isomer 117.8221
139.p-Dimethylaminoazobenzene17.9081
140.Chlorobenzilate18.0341
141.Famphur18.4851
142.3,3′-Dimethylbenzidine (o-tolidine)18.5481
143.Kepone18.5481
144.Benzyl butyl phthalate18.6401
145.Bis(2-ethylhexyl)adipate18.8911
146.2-Acetylaminofluorene19.0171
147.4,4′-Methylene-bis(2-chloroaniline)19.1081
148.3,3′-Dichlorobenzidine19.5601
149.Benz[a]anthracene19.5601
150.Chrysene-d1219.5601
151.Chrysene19.6121
152.Bis(2-ethylhexyl)phthalate19.8231
153.6-Methylchrysene20.4751
154.Di-n-octyl phthalate21.0301
155.Benzo[b]fluoranthene21.5901
156.7,12-Dimethylbenz[a]anthracene21.5901
157.Benzo[k]fluoranthene21.6411
158.Benzo[a]pyrene22.2481
159.Perylene-d1222.3791
160.3-Methylcholanthrene23.0821
161.Dibenz(a,h)acridine24.3571
162.Dibenz[a,j]acridine24.4831
163.Indeno[1,2,3-cd]pyrene24.8831
164.Dibenz[a,h]anthracene24.9691
165.Benzo[g,h,i]perylene25.5411

Conditions

ColumnRMX-5Sil MS, 30 m, 0.25 mm ID, 0.25 µm (cat.# 17323)
Standard/Sample
Methapyrilene (cat.# 32460)
Appendix IX mix #1, revised (cat.# 32459)
SVOC additions (cat.# 31909)
Benzoic acid (cat.# 31879)
8270 MegaMix (cat.# 31850)
Appendix IX mix #2 (cat.# 31806)
Acid surrogate mix (4/89 SOW) (cat.# 31025)
Base neutral surrogate mix (4/89 SOW) (cat.# 31024)
Revised SV internal standard mix (cat.# 31886)
Diluent:Methylene chloride
Conc.:1 µg/mL
Injection
Inj. Vol.:1 µL split (split ratio 10:1)
Liner:Topaz 4.0 mm ID single taper liner w/wool (cat.# 23303)
Inj. Temp.:250 °C
Split Vent Flow Rate:12 mL/min
Oven
Oven Temp.:40 °C (hold 1 min) to 280 °C at 12.4 °C/min to 330 °C at 3.3 °C/min (hold 3.65 min)
Carrier GasHe, constant flow
Flow Rate:1.2 mL/min
Linear Velocity:39.7 cm/sec
DetectorMS
Mode:Scan
Scan Program:
GroupStart Time
(min)
Scan Range
(amu)
Scan Rate
(scans/sec)
1235-5505
Transfer Line Temp.:280 °C
Analyzer Type:Quadrupole
Source Temp.:330 °C
Quad Temp.:180 °C
Solvent Delay Time:2 min
Tune Type:PFTBA
Ionization Mode:EI
InstrumentAgilent 7890B GC & 5977B MSD
NotesTo simplify ordering, the SVOC MegaMix 150 kit (cat.# 31907) contains one ampul each of the following standards that were used in this experiment.
• 8270 MegaMix (cat.# 31850)
• SVOC Additions standard (cat.# 31909)
• Appendix IX mix #1, revised (cat.# 32459)
• Methapyrilene (cat.# 32460)
• Appendix IX mix #2 (cat.# 31806)
• Benzoic acid (cat.# 31879)

Mode SIM (200 pg “on-column”)

Semivolatiles on RMX-5Sil MS by 8270D (GC-MS in SIM Mode)

GC_GN1251

Peaks

PeakstR (min)Conc.
(ng/mL)
SIM IonDwell Time (ms)Ion Group
1.1,4-Dioxane-d82.40120096251
2.1,4-Dioxane2.42720088251
3.N-Nitrosodimethylamine2.70220074251
4.Pyridine2.77420079251
5.Ethyl methacrylate3.17520069251
6.2-Picoline3.55420093251
7.N-Nitrosomethylethylamine3.64820042251
8.Methyl methanesulfonate4.02120080251
9.2-Fluorophenol4.258200112251
10.Acrylamide4.54320071251
11.N-Nitrosodiethylamine4.977200102251
12.Ethyl methanesulfonate4.977200109251
13.Benzaldehyde5.45420077112
14.Phenol-d65.61220099112
15.Phenol5.63320094112
16.Aniline5.63320093112
17.Pentachloroethane5.7200167112
18.Bis(2-chloroethyl)ether5.74320063112
19.2-Chlorophenol5.814200128112
20.n-Decane (C10)5.96220057112
21.1,3-Dichlorobenzene6.066200146112
22.1,4-Dichlorobenzene-d46.154200150112
23.1,4-Dichlorobenzene6.18200148112
24.Benzyl alcohol6.39320079112
25.1,2-Dichlorobenzene6.426200111112
26.2-Methylphenol (o-cresol)6.611200108112
27.2,2′-Oxybis(1-chloropropane)6.63420045112
28.N-Nitrosopyrrolidine6.765200100112
29.Acetophenone6.825200105112
30.N-Nitrosomorpholine6.82520056112
31.N-Nitroso-di-n-propylamine6.82520043112
32.3-Methylphenol (m-cresol)6.88520080112
33.4-Methylphenol (p-cresol)6.885200107112
34.Indene6.885200117112
35.o-Toluidine6.885200106112
36.Hexachloroethane6.989200119112
37.Nitrobenzene-d57.06820082112
38.Nitrobenzene7.1200123112
39.N-Nitrosopiperidine7.347200114173
40.Isophorone7.53120082173
41.2-Nitrophenol7.671200139173
42.2,4-Dimethylphenol7.811200122173
43.Benzoic acid7.898200105173
44.O,O,O-Triethyl phosphorothioate7.942200121173
45.Bis(2-chloroethoxy)methane7.96920093173
46.2,4-Dichlorophenol8.113200162173
47.α,α-Dimethylphenethylamine (phentermine)8.17820058173
48.1,2,4-Trichlorobenzene8.264200180173
49.Naphthalene-d88.34200136173
50.Naphthalene8.378200128173
51.α-Terpineol8.45320059173
52.4-Chloroaniline8.518200127173
53.2,6-Dichlorophenol8.518200164173
54.Hexachloropropene8.572200213173
55.Hexachlorobutadiene8.674200225173
56.Quinoline8.993200129154
57.ε-Caprolactam9.08520055154
58.1,4-Phenylenediamine9.160200108154
59.N-Nitrosodibutylamine9.19520084154
60.4-Chloro-3-methylphenol9.477200107154
61.Isosafrole isomer 29.563200181154
62.2-Methylnaphthalene9.681200142154
63.1-Methylnaphthalene9.858200141154
64.1,2,4,5-Tetrachlorobenzene10.024200216154
65.Hexachlorocyclopentadiene10.024200237154
66.2,3-Dichloroaniline10.221200161154
67.Isosafrole isomer 110.221200104154
68.2,4,6-Trichlorophenol10.25200196154
69.2,4,5-Trichlorophenol10.303200198154
70.2-Fluorobiphenyl10.41200172154
71.Safrole10.549200131154
72.Biphenyl10.586200154154
73.2-Chloronaphthalene10.586200162154
74.1-Chloronaphthalene10.624200127154
75.2-Nitroaniline10.803200138135
76.Diphenyl ether10.803200170155
77.1,4-Naphthoquinone10.927200158135
78.1,4-Dinitrobenzene11.073200168135
79.Dimethylphthalate11.223200163135
80.1,3-Dinitrobenzene11.30120076135
81.2,6-Dinitrotoluene11.301200165135
82.1,2-Dinitrobenzene11.36320050135
PeakstR (min)Conc.
(ng/mL)
SIM IonDwell Time (ms)Ion Group
83.Acenaphthylene11.363200152135
84.3-Nitroaniline11.59120065135
85.Acenaphthene-d1011.649200162135
86.Acenaphthene11.706200153135
87.2,4-Dinitrophenol11.809200184135
88.4-Nitrophenol11.996200139135
89.Pentachlorobenzene11.996200250135
90.Dibenzofuran12.04320084135
91.2,4-Dinitrotoluene12.18320089135
92.1-Naphthylamine (1-aminonaphthalene)12.235200143135
93.2,3,5,6-Tetrachlorophenol12.339200232135
94.2,3,4,6-Tetrachlorophenol12.339200230135
95.2-Naphthylamine (2-aminonaphthalene)12.339200115135
96.Diethylphthalate12.596200149135
97.n-Hexadecane (C16)12.70320057296
98.Fluorene12.703200166296
99.Zalophus (thionazine)12.746200107296
100.4-Chlorophenyl phenyl ether12.746200204296
101.4-Nitroaniline12.74620065296
102.5-Nitro-o-toluidine12.746200152296
103.4,6-Dinitro-2-methylphenol (Dinitro-o-cresol)12.852200198296
104.Diphenylamine†12.98200169296
105.Azobenzene*13.04420077296
106.2,4,6-Tribromophenol13.162200330296
107.Sulfotepp13.385200322147
108.1,3,5-Trinitrobenzene13.581200213147
109.Phenacetin13.581200108147
110.Phorate13.61820075147
111.4-Bromophenyl phenyl ether13.677200248147
112.Diallate13.73520043147
113.Hexachlorobenzene13.788200284147
114.Dimethoate13.85720087147
115.Atrazine14.064200200147
116.4-Aminobiphenyl14.17200169147
117.Pentachlorophenol14.17200266147
118.Pentachloronitrobenzene (Quintozene)14.213200237147
119.Propyzamide14.377200173147
120.Phenanthrene-d1014.477200188147
121.n-Octadecane (C18)14.5220057147
122.Phenanthrene14.52200178147
123.Dinoseb14.616200211147
124.Disulfoton14.61620088147
125.Anthracene14.616200179147
126.Carbazole14.961200167308
127.Methyl parathion15.296200109308
128.Di-n-butyl phthalate15.779200149308
129.4-Nitroquinoline-N-oxide16.026200190308
130.Parathion (ethyl parathion)16.075200291308
131.Methapyrilene hydrochloride16.27320058308
132.Isodrin16.52200193308
133.Fluoranthene16.806200202308
134.Benzidine17.124200184308
135.Pyrene17.223200203308
136.p-Terphenyl-d1417.627200244279
137.Aramite isomer 217.627200175279
138.Aramite isomer 117.818200135279
139.p-Dimethylaminoazobenzene17.905200120279
140.Chlorobenzilate18.041200251279
141.Famphur18.487200218279
142.3,3′-Dimethylbenzidine (o-tolidine)18.553200254159
143.Kepone18.553200272279
144.Benzyl butyl phthalate18.64200149279
145.Bis(2-ethylhexyl)adipate18.89200129279
146.2-Acetylaminofluorene19.015200181279
147.4,4′-Methylene-bis(2-chloroaniline)19.561200231159
148.3,3′-Dichlorobenzidine19.561200212279
149.Benz[a]anthracene19.5612002281510
150.Chrysene-d1219.5612002401510
151.Chrysene19.612002261510
152.Bis(2-ethylhexyl)phthalate19.8242001671510
153.6-Methylchrysene20.4732002421510
154.Di-n-octyl phthalate21.0312001491510
155.Benzo[b]fluoranthene21.589200571510
156.7,12-Dimethylbenz[a]anthracene21.5892002561510
157.Benzo[k]fluoranthene21.6372002521510
158.Benzo[a]pyrene22.2492002531510
159.Perylene-d1222.3772002641510
160.3-Methylcholanthrene23.082002681510
161.Dibenz(a,h)acridine24.3572002791510
162.Dibenz[a,j]acridine24.482002801510
163.Indeno[1,2,3-cd]pyrene24.8822002771510
164.Dibenz[a,h]anthracene24.9682002781510
165.Benzo[g,h,i]perylene25.5372002761510

Conditions

ColumnRMX-5Sil MS, 30 m, 0.25 mm ID, 0.25 µm (cat.# 17323)
Standard/Sample
Methapyrilene (cat.# 32460)
Appendix IX mix #1, revised (cat.# 32459)
SVOC additions (cat.# 31909)
Benzoic acid (cat.# 31879)
8270 MegaMix (cat.# 31850)
Appendix IX mix #2 (cat.# 31806)
Acid surrogate mix (4/89 SOW) (cat.# 31025)
Base neutral surrogate mix (4/89 SOW) (cat.# 31024)
Revised SV internal standard mix (cat.# 31886)
Diluent:Methylene chloride
Conc.:200 ng/mL
Injection
Inj. Vol.:1 µL split (split ratio 10:1)
Liner:Topaz 4.0 mm ID single taper liner w/wool (cat.# 23303)
Inj. Temp.:250 °C
Split Vent Flow Rate:12 mL/min
Oven
Oven Temp.:40 °C (hold 1 min) to 280 °C at 12.4 °C/min to 330 °C at 3.3 °C/min (hold 3.65 min)
Carrier GasHe, constant flow
Flow Rate:1.2 mL/min
Linear Velocity:39.7 cm/sec
DetectorMS
Mode:SIM
SIM Program:
GroupStart Time
(min)
Ion(s) (m/z)Dwell (ms)
12see peak list 300
25.2see peak list 286
37.2see peak list 289
49.35see peak list 285
510.7see peak list 273
612.45see peak list 290
713.29see peak list 280
814.8see peak list 300
917.4see peak list 297
1019.3see peak list 285
Transfer Line Temp.:280 °C
Analyzer Type:Quadrupole
Source Temp.:330 °C
Quad Temp.:180 °C
Solvent Delay Time:2 min
Tune Type:PFTBA
Ionization Mode:EI
InstrumentAgilent 7890B GC & 5977B MSD
NotesTo simplify ordering, the SVOC MegaMix 150 kit (cat.# 31907) contains one ampul each of the following standards that were used in this experiment.
• 8270 MegaMix (cat.# 31850)
• SVOC Additions standard (cat.# 31909)
• Appendix IX mix #1, revised (cat.# 32459)
• Methapyrilene (cat.# 32460)
• Appendix IX mix #2 (cat.# 31806)
• Benzoic acid (cat.# 31879)

Références

  1. E. Pack, J. Hoisington, C. English, R. Dhandapani, and C. Myers, Méthode GC-MS/MS complète pour l’analyse des composés semi-volatils à l’état de traces, Note d’application, EVAN4920-FR, Restek Corporation, 2025.
  2. RMX GC columns brochure, GNBR4923-UNV, Restek Corporation, 2026.
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Produits Mentionnés


Colonne capillaire GC RMX-5Sil MS, L 30 m, DI 0.25 mm, 0.25 µm
Insert Topaz, Gooseneck Splitless, 4.0 mm x 6.5 x 78.5, pour GC Agilent, avec laine de quartz, désactivation Premium, lot de 5
Détecteur électronique de fuites de gaz Restek
Kit de solutions-étalons SVOC MegaMix 150, 1 ml/ampoule ; 6 ampoules/kit
Solution étalon pour le réglage des GC-MS, 1000 µg/ml, chlorure de méthylène, ampoule de 1 ml
Solution étalon de composés de substitution acides (4/89 SOW), 2000 µg/ml, méthanol, ampoule de 1 ml
Solution étalon de composés de substitution basiques ou neutres (4/89 SOW), 1000 µg/ml, chlorure de méthylène, ampoule de 1 ml
Mélange d’étalons internes de SV révisé, 4000 µg/ml, chlorure de méthylène, ampoule de 1 ml

Authors

  • Jessi Collier

    Jessi is an advanced scientist in the GC applications group where her work focuses on environmental and food contaminants. Prior to joining Restek in 2023, she worked for the Mississippi State Chemical Lab as a pesticide residue analyst, primarily testing regulatory samples, agricultural samples, environmental samples, foods, and other consumer products via GC-MS, GC-MS/MS, GC-FID, and GC-ECD. Jessi holds a BS in chemistry and a BA in Mandarin Chinese from Mississippi State University.

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  • Erica Pack, PhD

    Erica is an interdisciplinary GC applications and technologies scientist at Restek. She obtained her bachelor's degree in forensic biology from The Pennsylvania State University, and her doctorate from Virginia Tech in plant pathology, physiology, and weed science. Since joining Restek in 2021, she has worked with a wide variety of GC columns, including fused silica, MXT, PLOT, and packed columns as well as accessories, such as liners, valves, and methanizers.

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  • Ramkumar Dhandapani

    Dr. Ramkumar Dhandapani is a seasoned analytical chemist with over 23 years of experience in the chromatography industry and a Ph.D. in analytical chemistry. During his career, he has specialized in method development, validation, and the troubleshooting of chromatography methods. He has developed numerous regulatory-compliant methods across diverse sectors, including environmental analysis, food quality and safety, pharmaceutical, fuels, and chemical industries. Currently, Dr. Dhandapani is the Director of Product Management at Restek, he is keen on innovation in chromatography and scaling breakthrough innovations to market as commercial products.

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  • Colton Myers

    Colton Myers is the R&D manager for sample preparation at Restek Corporation with over 10 years of experience in product development and application innovation, particularly in solid phase microextraction (SPME) and volatile analysis. He has made contributions across various industries, authoring multiple peer-reviewed publications. Starting his career in quality control before transitioning to the GC Innovations team, Colton now leads a team dedicated to advancing sample preparation and collection technologies. He holds a BS in chemistry from Juniata College.

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EVFA4921-FR