Re: Arsenic carcinogenicity: numbers ERIC!!!

[Guest guest]

Your math is incorrect..

And it's extreme;y hard to convert ppb to micrograms as the density of

the material is part of the equation..

but a quick and dirty calculation shows approximately:

5 ppb = .005 mg/L ... so you're off by a decimal place.

Barb

>

> Thanks . I noticed the very low chronic-exposure

> carcinogenicity threshholds the other night, but your document has a

> good-looking ref for that info, which spurred me to nail down the

> numbers.

>

> The apparant carcinogenicity threshhold for lifetime exposure in

> drinking water is disturbingly low at ~3-10 ppb. Ten ppb is only 0.01

> mg /day, by my claculation, if you drink 1L of water. (I am assuming

> ppb indicates a mass ratio as implied by my second URL below; the term

> is ambiguous, as wikipedia discusses.)