. Author manuscript; available in PMC: 2009 Jul 1.

Published in final edited form as: Environ Sci Technol. 2008 Jul 1;42(13):4927–4933. doi: 10.1021/es800408u

Table 1.

Comparison of E. coli inactivation of several compounds in aqueous solution

No.	Compound	Conditions ^c (concentration, contact time, aeration etc.)	Log inactivation	Log inactivation / (mg/L·hr)
1	Iron(II,III) oxide nanoparticle ^a Magnetite (Fe₃O₄), spherical < 50 nm, >60 m²/g	9 mg/L, 1 hr, deaerated	< 0.1	-
2	Oxidized nano-Fe⁰^b	9 mg/L, 1 hr, deaerated
3	Oxidized nano-Fe⁰^b	90 mg/L, 1 hr, air saturation
4	Iron (Fe⁰) powder ^a < 10 μm, 0.26 m²/g	1 g/L, 1 hr, deaerated
5	Fe(III) ion (FeCl₃)	1 mM, 1 hr, air saturation and deaerated
6	Fe(II) ion (FeSO₄)	0.1 mM, 1 hr, air saturation
7	Fe(II) ion (FeSO₄)	0.1 mM, 1 hr, deaerated	> 3	-
8	Nano-Fe⁰ < 100 nm, 31.5 m²/g	9 mg/L, 10 min, deaerated	3.4 ^d	2.3
9		90 mg/L, 1 hr, air saturation	2.6 ^d	0.029
10		90 mg/L, 1 hr, air saturation, 1 mM phosphate	1.3	0.014
11		45 mg/L, 1 hr, air saturation, 1 mM oxalate	3.1	0.069
12	Nano-Ag⁰^e 15 ∼ 20 nm	10 mg/L, 1 hr, deaerated	3.0	0.30
13	Nano-Ag⁰^e 15 ∼ 20 nm	10 mg/L, 1 hr, air saturation	4.1	0.41

Obtained from Sigma-Aldrich Co.

Oxidized for 2 hr under air saturation

Unless otherwise specified: pH = 8.0 (carbonate buffer), T = 21±0.5°C, air saturation indicates open system to atmosphere

From the data of Figure 2

Prepared by photoreduction of silver ion in aqueous solution containing poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) block copolymers (Supporting Information, S3)