Many of t he p h ys ical-chemical properties of compo unds of low solu bili ty arc difficult to dete rmin e because of the necessaril y sma ll co nce ntrations of material. I n many cases advantage m ay be t aken of m easuremen ts of the absorp tion spectra if t he bands occur in favorable ranges of t he spectrum . The d ipheny l ketones fa ll in t hi s category a nd have been t he su bject of recent studi es.
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Sager et al. (1950) studied this question.