Seay that “38py 3g a> ta Mee pLUTONIUMIN SEA WATERS, ETC. tad | M. WONG E dis-s. A plutonium-236 source electroplated on a stutniess steel disc and used as a detector standard over a period of 32 months showed Joss of neither activity (othe than its normal decay} nor resolution. red with by > being very Adsorption floss of plutonium on several laboratory wares was also checked. is. Radium. nium in the | E. Known amounts of plutonium-236 standard were evaporated in Pyrex beakers, Teflon e beakers, ceramic and Vycor crucibles with hydrochloric—nitric acid mixtures: the B standard was then transferred to an electroplating apparatus, electroplated and F counted. No significant difference was found in these standards from one that was ete yg y soar heend “oe Oe Caan “wal . 2 : directly electroplated. The author ts very grateful to Dr. V. T. Bowen for his advice and encouragement. This work was supported by the U.S. Atomic Energy Commission under > contract AT (30-!}-2174. Contribution No. 2712 from the Woods Hole Oceanographic - Institution, " igTASIESIN me op PranaBag, " SUMMARY sample} and 0.002 d.p.m. per kg of marine organisms (1-kg sample). An iron(IQ) sediments and ashed organisms. Factors influencing the recovery, contamination and blank activity are discussed. RESUME Une méthode radiochimique est décrite pour le dosage du plutonium dans des échantilons d’eaux de mer, de sédiments et dorganismes marins. avec des aration of iron - Sensibilités de 0.004 d.p.m./100 1 (prise d’échantilion 30 1), 0.02 d.p.m./kg (prise de y hydrochloric many columnlorium—nitrate dJrochtoric acid uilibrated with 100 g}) et 0.002 d.p.m./kg (prise de 1 kg) respectivement. Le plutonium est concentré par coprécipitation avec lhydroxyde de fer{I1). Un traitement au mélange acide AS age eg eee tneieee OTe oPRic ae ed eee 6 so : Nitrique~acide chlorhydrique est proposé pour sédiments et cendres d’organismes. ’ Divers paramétres sont examinés. imn plutonium peue'gaioan ZUSAMMENFASSUNG Es wird ein radiochemisches Verfahren beschrieben, mit dem Plutonium in grossen Proben von Meerwasser. Sedimenten und Organismen mit einer Empfindlichkeit von 0.004 d.p.m./100 1 in Meerwasser (bei einer 50 !-Probe), 0.02 d.p.m./kg in Sedimenten (100 g-Probe) und 0.002 d.p.m./kg in maritimen Organismen(1 kgProbe) bestimmt werden kann. Fiir die Anreicherung des Plutoniums in Meerwasser wird eine Eisen(II)-hydroxid-Mitfallungsmethode angewendet. Sedimente und veraschte Organismen werden mit einem Gemisch von Salpeter- und Salzsaure ausge- zogen. Die Faktoren. die den erfassten Antei). die Kontamination und Blindaktivitat ; bezinflussen. werden diskutiert. 2 re he » ‘ seteak Liat thaw . a tad "red ey i” Ppa B ai rait pi ny wee, Mel oe reas thorium Is ission of 7°° Puls eVfor platinum per 100 1 of sea water (for a 50-] sample}, 0.02 d.p.m. per kg of sediments ({100-g hydroxide coprecipitation methodis used for the concentration of plutonium in sea water. A mitric-hydrochloric acid leaching method is adapted for the treatment of recipitates and d for the mountbecause they are ‘d sample is not x-resolution and A radiochemical procedureis described for the determination of plutonium in large samples of sea water, sediments and organisms with a sensitivity of 0.004 d.p.m. a 900428 Anal. Chim. Acta, 36 (1971) 355-364