Didn't do it myself but it want on a Seal AA3 Auto-Analsyer measuring NH3, NO2, DIN, PO4. Triplicate samples from each tank 3 times a week. NO3 range was 0.5 to 5 uM approxHi all, I know you were, it is just an example of why testing sea water maybe more straightforward than testing fresh water.
Which /www.nodc.noaa.gov/archive/arc0001/9900162/2.2/data/0-data/jgofscd/Files/protocols/chap9.html#:~:text=The%20concentration%20of%20reactive%20nitrate,mmol%20kg%20%2D1%20in%20seawater.&text=The%20determination%20of%20nitrate%20is,using%20a%20cadmium%2Dcopper%20column.']analytical method[/URL]"> to you use for your Coral work?
If you have enough time and money you can get accurate determination of all the solutes in water.
Sent from my Pixel 4 XL using Tapatalk