Dialysis Pretreatment for Dissolved Organic Nitrogen Analysis in Freshwaters

Figure 3

The concentrations of selected nitrogen species [NH₃-N(2), NO₃-N(2), and DON(2)] after dialysis against phosphate buffer. (a) The concentrations for all samples were presented, and (b) samples 1–6 and 13–15 with much lower TN were presented. Please note the difference of -axis scale between (a) and (b).

(a)

(b)