The analyses of KCL soil extracts for nitrate, nitrite and ammonium using a TRAACS 800 analyzer

Autor:	D.A. Tel, C. Heseltine
Rok vydání:	1990
Předmět:	Potassium Inorganic chemistry Soil Science chemistry.chemical_element Nitrogen chemistry.chemical_compound Sodium phenoxide chemistry Nitrate Sodium hypochlorite Ammonium Indophenol Nitrite Agronomy and Crop Science Nuclear chemistry
Zdroj:	Communications in Soil Science and Plant Analysis. 21:1681-1688
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629009368331
Popis:	Potassium chloride extracts of soils are often coloured due to organic or colloidal matter. A dialyzer was used to remove these interferences and reduce the sensitivity of the method to attain the optimum range in concentration for the simultaneous determination of nitrate, nitrite and ammonium at an analysis rate of 100 samples per hour. Highly coloured plant extracts were also analysed without interference. Ammonium is determined by the Berthelot Reaction, through the formation of a blue coloured compound apparently related to indophenol from the reaction of ammonium and sodium phenoxide, followed by the addition of sodium hypochlorite. Sodium nitroprusside is added to intensify the blue colour. Nitrate is reduced to nitrite at pH 7.5 in a copper‐cadmium reductor coil. The nitrite produced reacts under acidic conditions with sulfanilamide to form a diazo compound that couples with N‐1‐Naphthylethylenediamine dihydrochloride to form a reddish‐purple azo dye measurable at 520 nm.
Databáze:	OpenAIRE
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