TABLE 2.

Characteristics of the biofilm on plasticized polyvinyl chloride

Column(s)	Temp (°C)	ATP concn (avg ± SD)			Day 112 profile		Day 165 profile
		Biofilm (ng/cm2)	Water (ng/liter)	Ratio B/Wa	TCC (no./cm2)b	HPC (CFU/cm2)c	TCC (no./cm2)	CH (μg/cm2)d	Fe (μg/cm2)	Mn (μg/cm2)	Cu (μg/cm2)
1	38	27 ± 7	4.9 ± 2.0	6.8 ± 2.2	7.0 × 108	3.0 × 108	7.2 × 108	118	40	1.5	32
2	38	24 ± 11	4.6 ± 2.5	4.7 ± 2.3	6.7 × 108	1.4 × 108	5.0 × 108	108	38	1.4	28
3	38–42	22 ± 8	6.5 ± 3.7	4.6 ± 2.0	9.4 × 108	2.2 × 108	6.4 × 108	60	21	0.7	15
4	38	25 ± 7	4.3 ± 1.6	7.5 ± 3.2	5.3 × 108	1.3 × 108	5.1 × 108	96	42	1.8	35
5	38–42	23 ± 5	4.3 ± 3.2	7.7 ± 3.1	1.3 × 109	2.2 × 108	1.3 × 109	84	19	0.6	17
6	38	22 ± 6	5.7 ± 2.7	5.0 ± 1.5	9.5 × 108	2.0 × 108	6.9 × 108	132	30	1.1	24
7	38–42	26 ± 8	6.7 ± 2.4	4.3 ± 1.3	1.2 × 109	4.1 × 108	1.7 × 109	148	17	0.3	15
8	38	29 ± 8	7.3 ± 1.9	4.0 ± 1.1	5.3 × 108	2.2 × 108	4.3 × 108	113	25	0.9	15
9	38–42	22 ± 9	5.8 ± 1.4	3.1 ± 4.4	9.4 × 108	1.3 × 108	3.6 × 108	22	8.9	0.4	7
All (avg ± SD)	38	25.4 ± 2.8	5.4 ± 1.2	5.6 ± 1.5	(6.8 ± 1.7) × 108	(2.0 ± 0.7) × 108	(5.7 ± 1.3) × 108	113 ± 13	35 ± 7.2	1.3 ± 0.35	27 ± 7.8
All (avg ± SD)	38–42	23.2 ± 1.8	5.8 ± 1.1	4.9 ± 2.0	(11 ± 1.8) × 108e	(2.5 ± 1.2) × 108	(10 ± 6.1) × 108	79 ± 53	16.5 ± 5.3e	0.5 ± 0.2e	13.5 ± 4.4e

^aRatio of concentrations in biofilm (B) and water (W) from day 92 to day 154.

^bTCC, total cell count.

^cHPC, heterotrophic plate count.

^dCH, carbohydrate.

^eSignificantly different (P < 0.05) from concentrations in columns operated at 38°C.