Table 2.

Weight and atomic variation percentages of the elemental composition of MFCs electrodes.

Element	Abiotic MFC		Biotic MFC
	Weight %	Atomic %	Weight %	Atomic %
C K	48.27	59.06	9.77	14.8
O K	36.37	33.42	57.28	65.13
MgK	0.54	0.33	6.25	4.67
P K	4.77	2.26	13.16	7.73
K K	5.68	2.13	4.35	2.02
CaK	–	–	4.85	2.2
NaK	4.37	2.8	4.34	3.44