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Inorganic Interferences in the 2,4-Xylenol Spectro-photometric Method for Nitrate and Their Elimination by George Norwitz; Peter N. Keliher is a Chemistry article available to read on EtoBox.

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A study of inorganic interferences with the 2,4-xylenol spectrophotometric method for nitrate and their elimination is reported. Fifty-three substances do not interfere with the original method. Nitrite interferes somewhat by producing a faint yellow color. Certain reducing agents (Fe"', S'; S,O,'; and SCN-) cause low results by reducing the nitrate in the strong sulfuric acid solution, while some oxidizing agents (Mn'+, Crb+, V", and ClO;) cause low results by inactivating or destroying the 2,4-xylenol. Persulfate and small amounts of HzO, produce a slight deepening of the co!or; larger amounts of H,O1 cause low results, as do Cl; Br; I; and metals. The recommended maximum permissible limits (mg per IO-ml aliquot) for the original method are NOZ=N, Fe", S'; SCN; V'+, C!lO,; Cl; I; 0.2; Mn", CY+, S,O,'; 5; H20t, 0.02; S,O,'; Br; 0.1; metals, none. Procedures for the elimination of most of the interferences are described\_ Nitrite is destroyed with sulfamic acid. The interferences of reductants (Fe'+, S'; S,O,'; and SCN -) and oxidants (Mn'+ and CY+) are eliminated with hydrogen peroxide, the excess of which (and S2082-) is destroyed by boiling in the presence of Fe'\*. The interfer

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Author

George Norwitz; Peter N. Keliher

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1978

Language

EN

Field

Chemistry (Physical Sciences)