Formation of Humic Substances in Weathered MSWI Bottom Ash

Table 1

Elementary analysis of humic substance extracted from R-BA.

	Sample	C (%)	H (%)	N (%)	O (%)	C/N
Humic acid	Fresh R-BA	53.68	5.63	6.52	34.17	8.23
	24th weeks incubated R-BA	54.81	5.00	5.55	34.64	9.88
	Tan, 2003 [17]	53.8–58.7	3.2–6.2	2.6–5.05	39.7–48.8	12.3–17.3
Fulvic acid	Fresh R-BA	46.5	4.34	1.78	47.38	26.12
	Tan, 2003 [17]	40.7–50.6	3.8–7.0	0.8–4.3	32.9–51.9	18.4–37.8