NOTE: Please do not delete this question. It is not a personal health question. The question has broad utility, in cases where others find themselves in social-distancing or quarantine with need for surface sanitizer, and their only available ingredients are water and powdered oxy-bleach.
I need a quantity of surface sanitizer to decontaminate boxes delivered to the house during the Coronavirus19 social-distancing period.
CDC and WHO say 0.5% hydrogen peroxide solution will destroy coronavirus19. And powdered oxy-bleach a.k.a. Sodium percarbonate contains 32.5% by weight of hydrogen peroxide, I'll call it roughly a third.
So to make a water solution of hydrogen peroxide using powdered oxy-bleach, I'm thinking I need to add enough powdered oxy-bleach (by weight) to equal 3 x 0.5% of the weight of the water. I.e, for a gallon of solution, 1.5% of 8.3 pounds, thus 0.12 lb, or ~2 oz.
A friend checked this and agreed, saying: "A 0.5% H2O2 solution in water will consist of (per gallon): 0.42 lbs of H2O2 and 7.9 lbs of H2O. To get 0.42 lbs of H2O2 out of Oxy-bleach (32.5% H2O2), divide 0.42 by 0.325, which = 0.128 lbs or 2.0529230769 ounces...😁"
Can anyone poke holes in our thinking? Or refine it? Or suggest ways to make it easier for the lay-person locked-in without access to other surface sanitizers?
Thank you in advance!