USO DI ACIDI UMICI COME TENSIOATTIVI NATURALI e ...
USO DI ACIDI UMICI COME TENSIOATTIVI NATURALI e ...
USO DI ACIDI UMICI COME TENSIOATTIVI NATURALI e ...
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Table 3<br />
Assignments and relative area of CP MAS 13 C NMR bands for humic acid (HA)<br />
extracted from maize and others extracted from organic wastes and leonardite<br />
HAL a<br />
HAL C b<br />
HALO c<br />
HALO C d<br />
cHAL e<br />
cHAL2 f<br />
HA commercial<br />
g<br />
HA maize h<br />
Chemical shift<br />
(ppm)<br />
Alkyl-<br />
C<br />
0-50<br />
41.2<br />
41.0<br />
47.4<br />
49.6<br />
45.2<br />
49.5<br />
44<br />
26.78<br />
O/N-alkyl-<br />
C<br />
50-110<br />
33.3<br />
32.8<br />
31.3<br />
30.0<br />
21.1<br />
21.6<br />
14<br />
42.29<br />
Aryl-C<br />
(%)<br />
110-<br />
160<br />
17.9<br />
17.2<br />
12.3<br />
12.7<br />
21.6<br />
16.5<br />
24<br />
21.06<br />
Carbonyl-<br />
C<br />
160-200<br />
7.9<br />
9.1<br />
9.0<br />
7.7<br />
12.1<br />
9.7<br />
17<br />
9.88
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