UNCIASSIFTED The simplest method of analysis is the direct solution of bdme ash in HNOa, dilution to suitable volume and determination of strontiua content by flame photometry. This method is subject to errdrs of suppression by extraneous elements in the solution. The defree of this svepression was determined by the addition of known quintities of strontium to solutions of bone ash which had previously Been messured. The direct analysis did not he7ve eufficient. yensitivity, sq@ separation of strontium from calcium was made by a double precipitation. The results of the first set of tests on bone samples are shown in Table A-3. the ditrate sgiked Table A-8 of Samvle No. Sr Added 1 2 3 y - O ag 10 20 x” S Found. O ag 7.5 2 26 50 L7 $s 75 100 37 94 The low recovery of the 10 ug quantity and the absence off strontium tn the nonspiked sample is attributed to the lack of suitable aaterial to form sufficient precipitate to carry down the tration of strontium. It is suggested that 10 ng of bargus be used as @ collecting agent for low concentrations of stronti Wth the carrier, the recovery for low strontium was brobzht uw to over 90%. A set of spiked bones were mm at lower stronBium levels, with the results shown in Table A-?. Be .¥E Jf ye We ) Yael ee ae La, S yeBeg. wee a: :. geet . OG *%. et ree ra ¥ : aR, . “ Table Aw? Strontium Recove Sample No. wempie 1 2 3, S Sr Added ee] O mg 1 3 5 Barium Carrier Photometer Re SCL 9 ¥ L6 Off-acale The bone sancle used for spiking (Amputation from Bell vue Hospital) was shown to contain 0.019% Sr. tts Cy UNCLASSIFIED 00131986.053 1057082