Study on Dicarboxylic Acids in Aerosol Samples with Capillary Electrophoresis

Table 3

DCAs in the aerosol samples studied. Samples were pretreated following the optimized concept informed in the experimental. Separation conditions as in Table 1.

Atmospheric aerosols	C2(ng/m^3)	C3 (ng/m^3)	C4 (ng/m^3)	C5 (ng/m^3)	C6 (ng/m^3)	C7 (ng/m^3)	C8 (ng/m^3)	C9 (ng/m^3)	C10 (ng/m^3)
Air sample 1 (1st lot)	2.64	<MDL*	1.85	2.73	nd	nd	<MDL****	nd	nd
Air sample 2 (2nd lot)	3.66	4.21	nd	nd	nd	1.71	nd	nd	1.94
Air sample 3 (3rd lot)	3.80	1.16	nd	4.35	6.25	nd	2.92	nd	1.85
Air sample 4 (4th lot)	<MDL**	<MDL*	nd	0.472	nd	<MDL***	nd	nd	0.477

∗MDL 0.551 ng/m³; **MDL 0.477 ng/m³; ***MDL 0.472 ng/m³; ****MDL 0.463 ng/m³; signal-to-noise ratios (S/N) is 3.
aThe samples were taken on different days.
bUS + SPE means after ultrasonication of the sample it was treated with solid-phase extraction (Oasis).