Table 2.

Selected compounds identified in extracts of produced water from the Bakken and Three Forks Formations with estimated concentration ranges.

Compounds by class	Samples with detection∗ (From Table 1)	Estimated Concentration Range (μg/L)
1. Polycyclic aromatic hydrocarbons
Naphthalene	01-10,12	<1.0-1.2
1-Methyl-naphthalene	01-10,12	1.1-2.3
2-Methyl-naphthalene	01-10,12	<1.0-1.5
1,6-Dimethyl-naphthalene	01	1.6
2. Aromatics
p-Xylene	01-09,12	5.1-9.7
Mesitylene	01-09,12	2.3-8.0
Trimethyl-benzenes (not including Mestiylene)	01-03,05,09,12	1.8-3.9
N-Phenyl-formamide	07	11.5
3. Phenols
Phenol	01-10,12	12-46
p-Cresol	01-09,12	4.9-19
2-Methyl-phenol	01-05,07-09,12	4.5-18
Dimethyl-phenols	01-03,12	<1.0-3.7
2,2′-Methylenebis-phenol	04-09	3.8-28
4,4′-Methylenebis-phenol	04-10	8.3-63
4,4’-(1-Methylethylidene)bis-phenol	05	2.4
4. Glycol ethers
2-Butoxy-ethanol	10	>400
2-Phenoxy-ethanol	06,07	1.8-11
1-(2-methoxy-1-methylethoxy)-2-propanol (all isomers)	06,07	57-75
5. Alkanes
Dodecane	01	1.4
Tetradecane	01	1.4
Pentadecane	01	1.5
Hexadecane	01	1.7
Heptadecane	01	1.1
Octadecane	01	1.0
6. Cyclic non-aromatics and heterocycles
2-Methyl-2-cyclopenten-1-one	01,03,05-07	3.1-37
3-Methyl-2-cyclopenten-1-one	02-04,06-09,12	3.1-17
3-Ethyl-2-hydroxy-2-cyclopenten-1-one	04,07,08	1.2-9.5
3-Methyl-1,2-cyclopentanedione	04,07-09	6.8-54
Tetrahydro-2,5-dimethyl-furan	12	5.0
Dihydro-5-methyl-2(3H)-furanone	02,03	3.2-3.8
5,6,7,8-Tetrahydro-N,N-dimethyl-1-naphthalenamine	01,03,12	1.1-2.5
1,2,3,4,5,6,7,8-Octahydro-acridine	01	<1.0
6(5H)-Phenanthridinone	08	1.6
4-Methyl-2-(2-methyl-1-propenyl)-pyridine	01-03,12	1.8-4.0
3-Benzyl-6-isopropyl-2,5-piperazinedione	04,09	4.4-4.6
Hexahydro-3-(2-methylpropyl)-pyrrolo[1,2-a]pyrazine-1,4-dione	04,07-09	4.9-13
Hexahydro-3-(phenylmethyl)-pyrrolo[1,2-a]pyrazine-1,4-dione	04,06-08	1.6-12
7. Other Compounds
Octanoic acid	09	1.9
9-Octadecenamide	03	2.3
N,N-Dimethyloctylamine	01,02	4.9-17.7

^∗Sample 11 was not collected for extractable hydrocarbon analysis.