What Ratio of Peracetic acid?

[paz1]

Hi,

I am being very thick here, but can some please spell it out for me. I have read several post regarding the ratio of dilution of Peracetic Acid, but I am still just as confused as before reading them. I can not get my head round the figures of making up x% solution.

Can someone please provide me a ratio for how many mls of Peracetic acid (5%) I add to 1 litre of water. Any help will be greatly appreciated.

[Kev888]

I have some 5% solution from the Malt Miller (though I just noticed it seems to have disappeared from his site..). It suggests a rate of 3-to-5ml added to 250ml of water, so that would equate to 12-to-20ml added to 1L of water. To be honest, I just went with that suggested ratio and haven't bothered to calculate what it means in terms of 'actual' dose, but here goes:

20ml of 5% peracetic in 1000ml = 2ml in 100ml, but the solution is only 5% to begin with, so the actual amount of peracetic acid is 5% of 2ml = 0.1ml in 100ml, or 0.1% If you wanted to make about 250ml or so at a strength of 0.1%, then the quantity of acid needed is about 250 x 0.1 / 100 = 0.25ml. But the original mix is only 5% acid, so 0.25ml is only 5% of what must actually be added; the total (100%) of whats needed would be 100 / 5 x 0.25 = 5ml

At least that 'seems' right.. As I mentioned I've not worked it out before so anyone able to confirm that this is about right would be most welcome..

Cheers
kev

[paz1]

Thanks Kev, thats really helpful. Thanks alot.

I was going crazy thinking will I burn my hands or will I leave the equipment unsanitiased.

Having followed your equation through, it also makes sense and seems logical.

Thanks once again.