Toxicity Assessment of Sediments with Natural Anomalous Concentrations in Heavy Metals by the Use of Bioassay

Table 3

Toxicity index of the water extract at 5 min (I5) and 15 min (I15). (M: mean; SD: standard deviation; a, b: significant differences (𝑃<.05) in Tukey test).

	Sample	1	2	3	4	5	6	7	8	9	10	11	12
I5	M	−0.13a	−0.01b	−0.07b	−0.21a	0.10b	0.05b	0.04b	−0.03b	0.01b	−0.03b	−0.14a	0.08b
	SD	0.02	0.07	0.08	0.05	0.10	0.03	0.02	0.01	0.08	0.03	0.03	0.10
I15	M	−0.15a	−0.02b	−0.09b	−0.19a	0.08b	0.08b	−0.03b	−0.06b	0.00b	−0.04b	−0.15a	−0.01b
	SD	0.02	0.09	0.05	0.03	0.09	0.05	0.02	0.04	0.08	0.05	0.01	0.05