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Application of direct photometry to agricultural analysis
Author(s) -
Scott R. O.
Publication year - 1960
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740111007
Subject(s) - zinc , copper , manganese , ammonium acetate , magnesium , chemistry , acetic acid , analytical chemistry (journal) , soil water , coefficient of variation , nuclear chemistry , photometry (optics) , environmental chemistry , mineralogy , chromatography , environmental science , soil science , physics , organic chemistry , stars , high performance liquid chromatography , astronomy
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.