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Freshwater phytoplankton
"P van Rijckevorsel" wrote in message .. .
Jelena 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! |
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