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Partitioning behavior of the antifouling booster biocide, Irgarol-1051 (2-methythio-4-
tert-butylamino-6-cyclopropylamino-
s-triazine), its production by-product, M3, and its environmental transformation products, M1 and M2, were studied. Octanol–water partition coefficients, log
K
OW, and organic matter–water partition coefficients, log
K
OC, of these
s-triazines were measured by reversed-phase HPLC and a triphasic SPME equilibrium model, respectively. The average log
K
OW (±SD) of the four
s-triazine species were: 4.39
±
0.07 (M3); 3.38
±
0.12 (Irgarol-1051); 2.92
±
0.12 (M2) and 2.54
±
0.11 (M1), while mean log
K
OC (±SD) of these species were: 2.47
±
0.03 (M3); 2.16
±
0.03 (Irgarol-1051); 1.97
±
0.03 (M2) and 1.79
±
0.04 (M1). These results were compared to reported physicochemical parameters of Irgarol-1051 in the literature. Partitioning behavior of these
s-triazine species in the coastal environment revealed by their
K
OW and
K
OC were also discussed.