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The Emission Spectrograph in Agriculture and Biology
Volume 6, Number 1 (Nov. 1951) Page 21-24
During the past few years, interest has grown in the role played in nutrition by the so-called trace elements. Present in minute quantities and either vital or toxic to plants or animals, these elements frequently elude all but the most sensitive analytical techniques; hence their name. With but a few exceptions, all of the trace elements are metallic and, as such are detectable by the emission spectrograph. For this reason, the spectrograph has turned out to be a valuable analytical tool in agriculture and biology.