TABLE 1.

Experimental conditions of the B. subtilis spore inactivation study

Water sample	pH	t-Butanol present	DOC (mg/liter)	No. of exp. seta	No. of samples	C0 (mg/liter)b	No. of microorganisms (104 CFU/ml)	k′ (s−1) (10−2)c
pH-controlled distilled water	5.6	No		6	30	1.00-1.82	26-32	0.06
	7.1	No		5	20	1.38-1.50	26-32	0.18
	8.2	No		6	33	0.91-1.65	26-32	0.26
	5.6	Yes		3	12	1.30-1.63	25-39	0.06
	7.1	Yes		3	12	1.32-1.55	26-39	0.18
	8.2	Yes		3	12	1.55-1.75	26-39	0.26
Water containing humic acid	7.1	No	1.2	2	11	2.50-3.00	20-50	0.54
	8.2	No	1.5	2	11	2.85-3.85	23-49	0.71
	7.1	Yes	1.2	2	9	2.15-3.20	22-45	0.54
	8.2	Yes	1.5	2	11	3.20-4.05	18-35	0.71
River water	5.7	No	2.4	2	10	1.50-2.10	21-49	0.26
	7.1	No	2.4	2	9	1.40-1.90	30-45	0.38
	8.2	No	2.4	2	10	1.00-2.10	20-50	0.53
	8.2	Yes	2.4	2	9	1.00-2.10	33-45	0.53

^aNo. of exp. set, number of independent experimental set.

^bC₀, initial ozone concentration.

^ck′, first-order ozone decay constant [found in C = C₀ exp (−k′t)].