[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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?