Table 2. Concentration of metals and metalloids in Ash Dam Water before and after the four week experiment under different CO₂ addition regimes.

Element	Initial	Final (after 4 weeks of culturing)
		No CO2	3L min-1 CO2	6L min-1 CO2
Al	110 ± 23	13 ± 0.42	32.5 ± 9.52	53 ± 11.63
As	33.5 ± 3	16 ± 0.23	16.3 ± 2.13	17.5 ± 8.12
B	4650 ± 95	4438 ± 51	4300 ± 109	4355 ± 17
Cd	0.6 ± 0.1	<LOD4	<LOD4	<LOD4
Ni	29.8 ± 1	4.5 ± 0.13	4.8 ± 0.93	9.8 ± 0.83
Se	42.5 ± 3	45.0 ± 3	40 ± 0	35 ± 5
Zn	52.5 ± 11	8.0 ± 1.02	10.8 ± 0.82	10.0 ± 0.72

Bold values exceed the ANZECC water quality criteria for natural freshwater bodies at the 95% protection level [21]

All data are mean concentrations (µg L^-1) ± S. E. (n = 4)

Superscript numbers indicate the week in which ADW concentrations first fell below ANZECC trigger values (Table 1).