Appendix 14. Calculated values for sunlight exposure time (min) at specified solar UV-A intensities as a function of survival of Escherichia coli.

Appendix 14. Calculated values for sunlight exposure time (min) at specified solar UV-A intensities as a function of survival of Escherichia coli.
Bacterial Survival (%)	Solar UV-A intensity (W/m²)

	2.0	4.0	6.0	8.0	10.0	12.0	14.0	16.0	18.0	20.0	22.0	24.0

95	4.5	2.2	1.5	1.1	0.9	0.8	0.6	0.6	0.5	0.6	0.4	0.4
90	8.7	4.4	2.9	2.2	1.7	1.4	1.2	1.1	1.0	0.9	0.8	0.8
85	14	6.8	4.5	3.4	2.7	2.2	1.9	1.7	1.5	1.4	1.2	1.2
80	19	9.3	6.2	4.6	3.7	3.1	2.7	2.3	2.1	1.9	1.7	1.6
75	24	12	8.0	6.0	4.8	4.0	3.4	3.0	2.7	2.4	2.2	2.1
70	30	15	9.9	7.4	5.9	5.0	4.2	3.7	3.3	3.0	2.7	2.6
65	36	18	12	8.9	7.1	6.0	5.1	4.5	4.0	3.6	3.2	3.1
60	42	21	14	11	8.5	7.0	6.0	5.3	4.7	4.2	3.8	3.7
55	50	25	16	12	9.9	8.2	7.1	6.2	5.5	5.0	4.5	4.3
50	58	29	19	14	12	9.6	8.2	7.2	6.4	5.8	5.2	5.0
45	66	33	22	17	13	11	9.5	8.3	7.4	6.6	6.0	5.8
40	76	38	25	19	15	13	11	9.5	8.4	7.6	6.9	6.6
35	87	44	29	22	17	14	12	11	9.7	8.7	7.9	7.6
30	100	50	33	25	20	17	14	12	11	10	9.1	8.7
25	115	57	38	29	23	19	16	14	13	12	10	10
20	134	67	44	33	27	22	19	17	15	13	12	12
15	157	79	52	39	31	26	22	20	17	16	14	14
10	191	95	64	48	38	32	27	24	21	19	17	17
9	200	100	66	50	40	33	28	25	22	20	18	17
8	209	105	70	52	42	35	30	26	23	21	19	18
7	220	110	74	55	44	37	32	28	24	22	20	19
6	233	117	78	58	47	39	33	29	26	23	21	20
5	248	124	83	62	50	41	35	31	28	25	23	22
4	267	133	89	67	53	44	38	33	30	27	24	23
3	291	145	97	73	58	48	42	36	32	29	26	25
2	324	162	108	81	65	54	46	40	36	32	30	28
1	382	191	127	95	76	64	54	48	42	38	35	33
0.5	439	220	146	110	88	73	63	55	49	44	40	38
0.1	572	286	191	143	114	95	82	72	64	57	52	50
0.01	763	382	254	191	153	127	109	95	85	76	69	66
Note: Data were obtained using equation 3 and mean experimental values.