N-Tris(hydroxymethyl)methyl-2-aminoethanesulfonic acid, for HPLC, biological buffer..
Naphthalene-2-sulfonic acid sodium salt, Ion pair chromatography..
Neutral red, pure, indicator grade, C.I. 50040..
Nickel solution 10 000 ppm, for ICP, standard metal solution in approx. 1M nitric acid..