Effect of Aging on the Adsorption of Tetracycline by Humic Acid: Insight into the Morphology and Chemical Composition

Table 3

Signs of each cross peak in the synchronous () and asynchronous () maps.

Position (cm^-1)	Sign
	912	1032	1401	1572	3416
912	+	+	—	—	+
1032		+	—	—	+
1401			+	+	+
1572				+	+
3416					+

(signs were obtained in the maps of 2D-COS map, + positive and - negative).