Complexation of Copper(II) with Humic Acids Studied by Ultrasound Spectrometry

Table 1

Elemental analysis and total acidity of humic sample (normalized on dry ash-free sample).

C (% at.)	H (% at.)	N (% at.)	S (% at.)	O (% at.)	Total acidity (mmol·g^−1)
43.9	40.2	0.7	0.2	15.0	5.0