On Fri, 4 Oct 1996, Allen Dick wrote:
 
> >      Fluvalinate is slightly toxic to birds.  The acute oral LD50
> > for fluvalinate in bobwhite quail is > 2,510 mg/kg.
>
> If I got this right, it takes 2.510 kg *per kg of quail* to kill half the
> quail(s?).  ( if 1mg=.001kg)
 
 
Allen was just a few orders of magnitude off. 1 g (gram)=0.001 kg
(kilogram); a milligram (mg) is one-millionth of a kilogram. Another way
of expressing mg/kg is as parts per million (ppm).
 
Tom Culliney
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