I´m among those that have been very hesitant about the new HI781. This because I know how difficult it is to analyse low level of NO3 in salt water-. I had said - i believe it when I see it
Now I have seen it and even test it.
What do I think about it now?
I have not be able to test it according to accuracy and precision - it means I have not test it against a known good method - only compare it with other hobby tests there you need to have a good ability to interpret colors. And yes I´m a little bit impressed after my two readings I know of experiences that when you use a new testing methodology - the first 10 - 20 tests are like using a shotgun - bullets everywhere. these two was 2.40 and 2.47 ppm. The result is line with expected figures.
However all this types of analysis of nitrate will be affected if there is NO2 in the test sample before the test. I know that my aquarium normally run between 0.01 and 0.03 ppm. Therefore I always analyse NO2 when I analyse NO3. Problem with the Hanna checker - I can´t find the conversion factor för NO2 interference on the NO3 readings.
@Hanna Instruments can you give me that conversion factor? If it is a high factor - it will affect the result rather much
Sincerely Lasse
Now I have seen it and even test it.
What do I think about it now?
I have not be able to test it according to accuracy and precision - it means I have not test it against a known good method - only compare it with other hobby tests there you need to have a good ability to interpret colors. And yes I´m a little bit impressed after my two readings I know of experiences that when you use a new testing methodology - the first 10 - 20 tests are like using a shotgun - bullets everywhere. these two was 2.40 and 2.47 ppm. The result is line with expected figures.
However all this types of analysis of nitrate will be affected if there is NO2 in the test sample before the test. I know that my aquarium normally run between 0.01 and 0.03 ppm. Therefore I always analyse NO2 when I analyse NO3. Problem with the Hanna checker - I can´t find the conversion factor för NO2 interference on the NO3 readings.
@Hanna Instruments can you give me that conversion factor? If it is a high factor - it will affect the result rather much
Sincerely Lasse
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