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Some factors in the Nessler method of nitrogen determination

✍ Scribed by James L. Leitch

Publisher
Elsevier Science
Year
1948
Tongue
English
Weight
245 KB
Volume
245
Category
Article
ISSN
0016-0032

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✦ Synopsis

The following factors involved in the use of the Nessler reagent for the determination of nitrogen are discussed in a paper by Miller and Miller (1): (1) effect of time and completeness of digestion, (2) effect of addition of hydrogen peroxide and the optimum use thereof, (3) rate of addition of reagent to digested sample, (4) rate of mixing of reagent with sample, (5) stability of color, (6) temperature of final solutions, and (7) effects of interfering substances. The purpose of this paper is to present additional data (a) dealing with the effect of the amount of sulfuric acid used for the digestion on the final color intensity, and (b) extending the range of the method by the use of various light filters.

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## Abstract 1. A modified Nessler reagent in which the ratio HgI~2~ : KI : NaOH is 1 : 2.2 : 20 is described. It is clear and ready for immediate use and is less susceptible to interference by various cations. Distillation with phosphoric acid was satisfactory for preparing ammonia‐free water. The

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## Abstract The total nitrogen content of plant tissue may be determined by direct nesslerization of sulphuric acid‐hydrogen peroxide digests with accuracy up to 5%. Similar application to soil extracts involves somewhat greater errors. In a spectrophotometric study of the Nessler colour, a filter