Re: Lamotte 3121 phosphate w/octet comparator
Yes, I do, but you can still do a lot with the other test kits.
It uses a spec to measure light intensity and spectrum precisely, so it measures color in nanometers. You calibrate it and then start testing the samples. Then the data feeds into a an Excel file etc.
Takes a while to fire up but not if you need to do 5 to 1000 water samples.
They make very nice small ones, ion specific(singlke wavelength) for about 175$ea for NO3 that are accurate to 0.1ppm of NO3.
Reagents run about 45$.
Then you jump up to multiphotometers(these have preset wavelenghts of several sizes) and these run 500-1000$ new, and then spect's which cover any range of light from 400-700 or higher /lower ranges for 1200-5000$ or more depending on what they have.
There are also autoanalyzers that run even more, 10,000-50,000$ each.
I doubt many of the folks realize what I use and the level I've done some of these test.
It's not so much that, as it is ther assumptions you build in to the idea you want to test that's important, some times you need stuff like this for a number of things, we generally don't for hobbyists.
Even less so if you do EI, you don't need to test for non CO2 methods either, but it's nice to see what occurs there.
But it's not needed.
The non CO2 method can be improved on with some minimal dosing once every 1-3 weeks and I will discuss this later.