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nitrite-nitrogen vs. real nitrite?
My Tetra Laborett test kit makes the following statement about testing for
nitrite, and I am hoping someone more chemically-minded can explain it to me.
<<<Bear in mind that the scale readings only give the nitrite-nitrogen
concentration. To obtain the real nitrite concentration, multiply the
value obtained from the test by 3.3>>>
There are even two colour charts, one labelled "NO2-N" and the other just
"NO2-". The colours on the two charts are almost identical, but the
numbers are different, of course the numbers on the NO2- chart are 3 times
higher than those on the other chart.
Could anyone please explain?