Copper content in CO and CO/Cu hydrolysates and in CO and CO/Cu solid residues after hydrolysis [mg L⁻¹]^a.

Designation of samples	Mass of sample [g]*	Cu [mg L−1]*	% Cu [%]	Mass of Cu in SR after hydrolysis of 1 g of sample [g]	Mass of Cu in H after hydrolysis 1 g of sample [g]
1 – SR	0.148	42.96	0.73	0.007	—
2 – SR	0.157	1548.43	24.52	0.199	—
3 – SR	0.136	57.79	1.07	0.009	—
4 – SR	0.134	4156.53	37.90	0.295	—
1 – H	3.090	3.73	∼0	—	0
2 – H	3.081	297.45	0.23	—	0.046
3 – H	3.041	1.97	∼0	—	0
4 – H	3.059	50.86	0.04	—	0.008

^aSR – solid residue, H – hydrolysate, *average results from three measurements, Cu% – wt in CO sample from ICP measurement = 0.02% (for 1 g sample of CO m_Cu = 0.002 g), Cu% – wt in CO/Cu sample from ICP measurement = 23.64% (for 1 g sample of CO/Cu m_Cu = 0.236 g).