Abstract
The advantages of the spectrograph as a means of performing qualitative and quantitative analyses for metals and for certain non-metallic elements are well recognized. The method is rapid, accurate and economical and may be applied to very small samples. Furthermore, the spectrographic plate gives a permanent record of the quantities of all the constituents in a sample, although only one or two may have been of interest at the time the analysis was performed. The spectrograph has not been much used in plant physiological research largely because the initial cost of instruments suitable for quantitative analysis of plant materials is rather high. The present paper describes a relatively inexpensive spectrograph which has been used with considerable success for the analysis of plant ash.
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