Sorption of Sulfonamide Antibiotics to Soil Organic Sorbents: Batch Experiments with Model Compounds and Computational Chemistry

Table 3

Speciation data for the sulfonamides SAA, SPY, and SDT at the examined pH values (data calculated using p𝐾_a values from [18]).

	pH	Cation	Neutral	Anion	Zwitterion
SAA	4.5	21.59	78.40	0	0.01
	6.0	0.86	99.10	0	0.01
	7.5	0.02	99.90	0.07	0.01
SPY	4.5	62.40	37.51	0.01	0.08
	6.0	4.96	94.56	0.40	0.08
	7.5	0.10	88.65	11.18	0.07
SDT	4.5	29.42	70.23	0.16	0.19
	6.0	1.13	93.70	4.99	0.18
	7.5	0.03	37.50	62.40	0.07