Chemical profiles.

The chemical profile for the BGC types were divided by ICP-OES, FT-IR and 1H-NMR variables (omitted groups of variables are those with no high positive statistical dependence for the BGC type). Variables for ICP-OES are elements. Variables for FT-IR are the integrated area corresponding to the chemical bond in interval of wavelength (cm−1) showed in parentheses. Variables for 1H-NMR are the integrated area for the buckets (chemical shifts) in ppm; values in parentheses are chemical shifts assigned to the same compound or organic function.Chemical profiles.