Does anyone know of a reliable automated system for monitoring TN in river water where it is usually between 0.2 and 9 mg/L?

I want to set up a water quality (mainly major nutrients N, P, K and perhaps Fe) monitoring system for various flow points in the Okavango, which has VERY low levels of these solutes. Ideally the...

26 November 2014 2,905 9 View