Fig. 1. Measured ¹⁴C activity inside and outside the dialysis membrane after 48 h of equilibration. A schematic high performance liquid chromatography with ultraviolet detection (HPLC–UV) chromatogram (254 nm, total run of 15 min) is presented in relation to the five collected fractions used in the ¹⁴C analysis. The first fraction contains the sum of trinitrotoluene and its degradation products (TNT*) bound to dissolved organic matter (DOM), the second and fifth fractions are unknown ¹⁴C, and the third and fourth contain TNT and aminodinitrotoluene (ADNT), respectively.