Pesticide half life and stock solution ?

[WESAM]

Hi ,

I wonder when i read that my analyte has a half life of 80 day .That's means after 80 days it will remain half of it ! .In this case , how can people prepare stock solution from this analyte in methanol or pure water and use this stock for more than six months ? .

Even when this solid is in a container how can u use the container for more than six months or a year ?

Any help to understand this , i feel something going wrong in my understanding to the concept of this

Best Regards

W

[tom jupille]

A half-life of 80 days under what conditions? at what temperature? exposed to air or not? exposed to light or not?

All of those factors will affect stability.

[WESAM]

Oh i see thanks Tom , actually i didn't find this specification for my analyte in stock solution of water

but you are right must put this consideration in mind