Table 2.

pH measured of series of dilutions of wood leachate with control medium to algae after exposure for 72 h and the mean and SD values (n = 3).

Concentration of leachate (% v/v)	pH
	Name of wood leachate
	Mahogany	Cedrela	Wawa	Emire	Ceiba
Control	7.3 ± 0.2	7.3 ± 0.1	7.3 ± 0.2	7.3 ± 0.2	7.3 ± 0.2
20	6.6 ± 0.1	8.4 ± 0.2	9.0 ± 0.2	7.2 ± 0.1	11.2 ± 0.1
30	6.4 ± 0.2	9.5 ± 0.1	8.8 ± 0.1	7.1 ± 0.2	11.1 ± 0.1
45	6.4 ± 0.1	9.7 ± 0.2	8.7 ± 0.2	6.8 ± 0.1	10.2 ± 0.1
67	6.3 ± 0.2	8.6 ± 0.2	8.5 ± 0.2	6.7 ± 0.1	9.0 ± 0.1
100	5.0 ± 0.1	7.4 ± 0.1	8.3 ± 0.1	4.7 ± 0.2	8.9 ± 0.2