The Effect of Dissolved Humic Acids on Aluminosilicate Formation and Associated Carbon Sequestration

Table 3

Composition of precipitates derived from solutions with initial 0.5, 0.75, and 1.0 mM initial Al; 0.5 mM initial Si and 0 or 0.5 mM (6 mg/L) DOC.

	Al-Si					Al-Si-DOC
	Initial	Precipitate				Initial		Precipitate
[Al] mM	Al/Si^1	Mass^2 (mg)	Al wt percent	Si wt percent	Al/Si^1	Al/Si^1	Al/C^1	Mass^2 (mg)	Al wt percent	Si wt percent	C wt percent	Al/Si^1	Al/C^1
0.5	1	72	22.7	10.9	2.2	1	1	58	17.9	8.6	12.0	2.2	0.7
0.75	1.5	190	23.3	9.2	2.6	1.5	1.5	169	25.9	9.8	9.3	2.7	1.2
1	2.1	142	20.3	9.0	2.3	2	2	182	20.2	7.8	5.2	2.7	1.7

¹Mole ratios.
²Uncertainty is ± 1 mg.