TABLE 3

Biocide concentrations measured during spore treatment with various combinations of H2O2 and PAA

Time (min)Mean (SD) target biocide concna
1% H2O2–0.05% PAA1% H2O2–0.15% PAA3% H2O2–0.05% PAA
H2O2PAAH2O2PAAH2O2PAA
01.06 (0.04)0.047 (0.00)1.10 (0.04)0.142 (0.005)3.27 (0.02)0.048 (0.00)
51.03 (0.02)0.045 (0.001)1.07 (ND)0.137 (0.003)3.14 (0.07)0.046 (0.001)
150.99 (0.03)0.043 (0.001)1.07 (0.01)0.139 (0.000)3.18 (0.06)0.045 (0.001)
  • a For the 0- and 15-min time points, n = 2; and for the 5-min time point, n = 4 for 1% H2O2–0.05% PAA, n = 1 for H2O2 and n = 2 for PAA in 1% H2O2–0.15% PAA, and n = 2 for 3% H2O2–0.05% PAA. ND, not determined.