Application of direct photometry to agricultural analysis

Autor:	R. O. Scott
Rok vydání:	1960
Předmět:	Nutrition and Dietetics Magnesium Analytical chemistry chemistry.chemical_element Manganese Zinc Copper Acetic acid chemistry.chemical_compound chemistry Soil water Boron Agronomy and Crop Science Ammonium acetate Food Science Biotechnology Nuclear chemistry
Zdroj:	Journal of the Science of Food and Agriculture. 11:584-592
ISSN:	1097-0010 0022-5142
DOI:	10.1002/jsfa.2740111007
Popis:	The applications of two direct-reading spectrometers (porous-cup spark method) to the analysis of agricultural materials are described: (1) a two-channel instrument for the determination of 0.3–24 p.p.m. of magnesium in acetic acid and ammonium acetate extracts of soils and HCl extracts of plant materials; a coefficient of variation in direct analysis of about ±2.0% is found. The major composition of agricultural samples does not affect the determinations; (2) the eleven-channel Hilger Medium Direct Reader for the determination in soil extracts of 0.1–24 p.p.m. copper, 1–400 p.p.m. manganese and 1–50 p.p.m. zinc, the coefficients of variation being ±1.10%, ±1.64% and ±7.01%, respectively. A tentative pelleted rotating disk method is given for the determination of zinc, boron, manganese and copper in ashed plant materials with coefficients of variation of ±1.9%, ±2.8%, ±3.3% and ±5.4%, respectively.
Databáze:	OpenAIRE
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