Maybe you can give me some recommendation on this matter. I have two reactors, one of them contains a solution of 90% water type 2 and 10% banana peels. On the other hand in reactor two there is a solution of 90% swine wastewater and 10% banana peels. The question is, to determine nitrogen in both samples should I do it in the liquid (previous filtration) or should I do it in the suspended solids contained in both liquids?

Where to determine nitrogen?