Re: Freshwater phytoplankton

"P van Rijckevorsel" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> Jelena <[EMAIL PROTECTED]> schreef
> > Besides, in a surface layer of lake sometimes
> > I got negative values of concentration of chl a (?) and I am wondering
> > how it is possible to get negative value, minimal concentration should
> > be zero, not less then zero.
> 
> + + +
> Obviously, if you are measuring negative concentrations you are doing
> something wrong. More likely in your calculations than in your measurements,
> but who knows ...
> PvR

That is first what I had in my mind - wrong calculation, but formula
is OK actually, it is ISO method that I use. Unbelivable things
sometimes can happen in science, isn't it? Thanks anyway, if you have
more sugestions you are very welcome, I really need help!