Table 3.

Concentration (μg·g⁻¹) of Carboxylic Acids (Saturated, Unsaturated, Branched, and Dicarboxylic) in the Dallol Samples

Carboxylic acids	Abbreviationa	D6	D7	D8	D10	D11
Octanoic acid	C8	0.011	0.014	0.001	0.001	0.011
Nonanoic acid	C9	0.003	0.028	0.002	0.002	0.003
Decanoic acid	C10	0.013	0.018	0.001	0.001	0.013
Undecanoic acid	C11	0.002	0.001	0.001	n.d.	0.002
Octanedioic acid	di-C8	0.004	0.003	0.004	0.005	0.004
Dodecanoic acid	C12	0.024	0.070	0.010	0.008	0.02
Nonanedioic acid	di-C9	0.014	0.011	0.005	0.003	0.005
Tridecanoic acid	C13	0.002	0.002	0.010	0.019	0.002
Decanedioic acid	di-C10	0.002	0.001	0.002	0.003	0.002
Tridecanoic acid, 12-methyl-	isoC14	n.d.	0.002	0.002	n.d.	n.d.
cis-9-Tetradecenoic acid	anteisoC14	n.d.	0.004	n.d.	n.d.	n.d.
Tetradecanoic acid	C14	0.019	0.050	0.012	0.071	0.019
Methyl 13-methyltetradecanoate	isoC15	0.003	0.003	n.d.	n.d.	0.003
Tetradecanoic acid, 12-methyl	anteisoC15	n.d.	0.005	n.d.	0.001	0.001
Pentadecanoic acid	C15	0.01	0.058	0.013	0.041	0.010
Pentadecanoic acid, 13-methyl	isoC16	0.001	0.002	n.d.	0.001	n.d.
Pentadecanoic acid, 14-methyl	anteisoC16	n.d.	0.002	n.d.	0.002	0.002
9-Hexadecenoic acid (Z)	C16:1 (ω7)	0.017	0.022	n.d.	0.001	0.020
Hexadecanoic acid	C16	0.27	0.413	0.374	0.280	0.174
Hexadecanoic acid, 15-methyl	isoC17	0.006	0.011	0.004	n.d.	0.004
Methyl 8-heptadecenoate	anteisoC17	0.003	0.009	n.d.	n.d.	0.003
Heptadecanoic acid	C17	0.017	0.021	n.d.	0.046	0.017
Heptadecanoic acid, 16-methyl	isoC18	n.d.	0.012	0.011	0.018	n.d.
9,12-Octadecadienoic acid (Z,Z)	C18:2 (ω6,9)	0.021	0.023	0.015	0.011	0.021
9-Octadecenoic acid (Z)-	C18:1 (ω9)	0.056	0.062	0.065	0.093	0.056
8-Octadecenoic acid (E)-	C18:1 (ω10)	0.024	0.042	0.035	0.024	0.004
Octadecanoic acid	C18	0.244	0.463	0.322	0.237	0.214
Nonadecanoic acid	C19	0.006	0.030	n.d.	0.037	0.006
Octadecanoic acid, 10-oxo-	Oxo-C19	0.002	0.002	n.d.	n.d.	0.002
Eicosanoic acid	C20	0.025	0.076	0.018	0.019	0.025
Heneicosanoic acid	C21	0.023	0.057	n.d.	0.015	0.023
Methyl 11-docosenoate	MM-C22	n.d.	0.004	0.004	0.010	n.d.
Docosanoic acid	C22	0.052	0.017	0.012	0.037	0.042
Tricosanoic acid	C23	0.020	0.074	n.d.	0.011	0.02
Tetracosanoic acid	C24	0.053	0.146	n.d.	0.030	0.034
Methyl,22-methyl-tetracosanoate	MM-C24	n.d.	0.016	0.007	0.015	0.010
Pentacosanoic acid	C25	0.013	0.029	n.d.	0.004	0.013
Hexacosanoic acid	C26	0.036	0.115	n.d.	0.021	0.026
Heptacosanoic acid	C27	0.003	0.020	n.d.	n.d.	0.003
Octacosanoic acid	C28	0.007	0.070	n.d.	0.001	0.007
Σ n-carboxylic acids		0.853	1.772	0.776	0.881	0.684
Σ unsaturated carboxylic acids		0.118	0.149	0.115	0.129	0.101
Σ dicarboxylic acids		0.020	0.015	0.011	0.011	0.011
Σ iso/anteiso carboxylic acids		0.013	0.050	0.017	0.022	0.013
Σ MM carboxylic acids		n.d.	0.020	0.011	0.025	0.010

^aC_x is used to denominate the linear and saturated (normal) carboxylic acids, where x is the number of carbons; C_x:y is used to denominate the unsaturated carboxylic acids, where x is the number of carbons and y the number of unsaturations; MM stands for mono-methyl chains and Oxo for the ketoacids.