Portions of the sorbent (0.2 g d.m.) and solutions (200 mL) containing the mixture of N–NO2, N–NO 3 , and P–PO
with concentrations ranging from 0.1:0.1:0.1 to 10.0:10.0:10.0 mmol/L were measured out to a series of 25-mL conical flasks.
The solutions had optimal pH, as determined in point 3.4. The
flasks were placed on a shaker (200 r.p.m.) for the period of
time specified in point 3.5. Afterward, analyses were conducted
for concentrations of nutrients (orthophosphate, nitrate III
and V) left in the solution. Parameters of these analyses are
provided in Table 4.