ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The colorimetric determination of nitrates in water

E. Hlucháň and J. Mayer

Institute of Hygiene, Bratislva

Abstract: A colorimetric method for detn. of small amts. of nitrates in water by Na salicylate and trichloroacetic acid is described. The max. absorption of the yellow-colored solns. is at 410 mμ. The direct dependence of color intensity on the amt. of nitrates is up to 70 γ NO₃^- in 50 ml. The interfering effect of cations can be eliminated by filtration through an ion exchanger. Of the anions NO₂^- increases the color intensity; it can be eliminated by the addn. of a small amt. of Na azide in the ion exchanger before filtration. I^- and Br^- decrease the yellow-color intensity in amts. over 25 γ.

Full paper in Portable Document Format: 106a387.pdf (in Slovak)

Chemical Papers 10 (6) 387–395 (1956)