2.2. Chemical composition of charcoal after cavitation
To characterize the properties of the charcoal suspension after
cavitation (CHAR-C), the following properties were determined in the
material: electrical conductivity – conductometrically, pH –
potentiometrically, and the content of N-NH4 and
N-NO3 – using ion selective electrodes. The contents of
macroelements (P, K, Ca, and Mg) and trace elements (Cu, Fe, Mn, and Zn)
were determined after mineralising the sample in a mixture of
concentrated HNO3 and HClO4 (3:2). The
contents of the studied elements were determined in the obtained
solutions by inductively coupled plasma optical emission spectrometry
(ICP-OES, Perkin Elmer Optima 7300 DV, Waltham, USA) (Oleszczuk et al.
2007). The material chemical composition is presented in Table 1.