Spectrographic Determination of Rubidium in Plant and Animal Tissues

Abstract

Because wet chemical methods generally are unsatisfactory, rubidium usually is determined hy spectrographic methods. Excitation of prepared samples of natural products by an electric arc or spark produce spectral lines of other elements that interfere with reading those of rubidium. This difficulty may be reduced by using flame excitation and a spectrograph of high dispersion. If the potassium concentration of the sample is high, as usually occurs in plant tissue, interference due to scattered radiation from intense potassium lines may be reduced by a mask, which prevents the energy from the potassum lines striking the spectrographic plate. Under proper conditions the method presented here is satisfactory for as low a concentration as 1 p.p.m. of rubidium in plant or animal tissue. The rubidium content of a number of human and animal foods was

Levels of copper, nickel, rubidium, and strontium in institutional total diets

“…Limited data show Rb contents of soybeans to be 160 to 225 ppm; tomatoes, 140 ppm; white flour brehd, <1 ppm; and beef meat. 140 ppm on a dry basis (Glendenning et al, 1955).…”

Some Factors Affecting Flame Photometric Emmission of Rubidium in Oxygen-Acetylene Flame

“…A study of the reactivities of amidoximes with transition metal ions disclosed useful color reactions resulting 1 Present address, E. I. du Pont de Nemours & Co., Inc., Seaford, Del. from the coordination of cobalt(II) ion with oxamidoxime (7). Precipitation of nickel(II) ion with oxamidoxime, HON: (NH2)C-C(NH2): NOH, has been reported (1) and was observed in this study.…”

“…(1) (Table V), results by the flame photo-i v i d u a l n o t d i r e c t l y a s s o c i a t e d w i t h s c i t e i s p r o h i b i t e d .…”

Bibliography on flame spectroscopy analytical applications 1800-1966/

“…Rubidium 16,71,139,144,180,181,182,184,187,188,189,190,191,192,193,315,341,343,407,410,466,475,493,497,532,536,539,541,543,546,610,617,638,640,667,672,678,684,713,721,734,743,772,787,813,824,829,855,859,861,877,878,882,927,940,947,982,1003,1008,1013,1021,…”