Figure 3

Fourier transform ion cyclotron mass spectrometry (FTICR MS) derived molecular compositions unique to (A) pristine and (B) effluent dissolved organic matter (DOM); left: van Krevelen diagrams; right: mass-edited H/C ratios. Colour code: blue, CHO; green, CHOS; orange, CHNO; and red, CHNOS molecular series. Circled area reflects the relative mass peak amplitude.