An X-Ray Flourescence Spectrometer will determine elemental analysis without the use of any reagents. I am not aware of an "automated" machine, so you'd have to figure that out. Out of curiosity I checked ebay.....found two used machines....one for 16,000 and the other for 99,000. Maybe we can do a group buy and move it from house to house.....although it is rather large.....throw in a fork truck.
anyone use the Hanna Nitrite Checker?