On 13/05/2013 17:10, hmandmpsaunders wrote:

Can anyone help with advice on the safe disposal of a small bottle of
malathion?

DO NOT DRINK IT! MSDS is reasonably helpful:

http://npic.orst.edu/factsheets/malatech.html

Probably the most environmentally friendly and easiest thing to do
(maybe no longer licensed as a pesticide) is to use it up on pests that
are not immune to its effects. Problem is too many pests are now immune.

Failing that dilute with water add a teaspoon of lime, stir and leave
outside for 24 hours and it will hydrolyse into much less toxic
component parts. It is still sold for treating head lice according to
Boots website so that gives you a rough idea of its toxicity.

--
Regards,
Martin Brown