Zur analytischen Bestimmung von Radium

Gübeli, O.; Jucker, Hans

doi:10.1002/hlca.19550380215

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…when the coprecipitation is carried out in a hot solution 0-1 Ν in sulphuric acid, buffered to a pH of 3, and by the dropwise addition of a slight excess of 0-1 Μ barium chloride. (24 ) Similar good results are obtained if the precipitation is carried out from homogeneous solution with sulphamic acid asthereagent. (25 ) No interference with the barium sulphate coprecipitation is caused by anions such as chloride, bromide, nitrate, and acetate.…”

Section: Separation By Coprecipitationsupporting

confidence: 56%

Radium

Korkisch

1969

Modern Methods for the Separation of Rarer Metal Ions

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RADIUMTRACES of radium are best isolated by coprecipitation with barium sulphate, or other insoluble salts, and then the radiometric assay of radium can be performed directly, or after its separation from the collector. For this purpose, cation exchange methods have proved to be most suitable. Separation on Ion ExchangersPractically all methods hitherto developed for the separation of radium from other elements by means of ion exchange are based on its retention by cation exchange resins from dilute acid, neutral, or weakly alkaline solutions, in the presence or absence of complexing agents. Among these complexing agents, EDTA is the most suitable for the separation of radium from barium and the other alkaline earth metals, because in such media the separation factor is significantly larger than in solutions containing citrate, lactate, acetate, formate or dilute mineral acids. When the pH of the solution is raised to 9 or higher, radium, in the presence of EDTA, is not appreciably adsorbed and thus can be eluted under these conditions. For example, in 0-01 Μ EDTA, the distribution coefficients of barium and radium on Dowex 50, X8 are respectively about 1-2 and 9 at pH 8-8, and much less than 0-5 and about 0-6 at pH 10-5.(1 )

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Section: Separation By Coprecipitationsupporting

confidence: 56%

Radium

Korkisch

1969

Modern Methods for the Separation of Rarer Metal Ions

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Der Aufschluß von Radiumsulfat mit Ionenaustauschharzen und die Abtrennung des Radiums D und Poloniums vom Radium

Dedek

1960

Z. Anal. Chem.

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Modified Determination of Radium in Water

Barker¹,

Thatcher²

1957

Anal. Chem.

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counts on the sample cell. The average of these two 10-minute counts was then compared with the interspersed comparison count. Table II gives the results of some typical determinations. ACKNOWLEDGMENT Grateful acknowledgment is made to G. E. Gerhardt who designed and constructed the housing and associated circuity for the photomultiplier tube and furnished valuable assistance in overcoming many instrumental difficultiesThe proposed method embodies a barium sulfate carrier precipitation, filtration through molecular filter membranes, and collection of activity after prescribed aging period. The method is sufficiently accurate and precise to indicate the potability of water and for use in general studies of radium in chemical hydrology. Amounts of radium as low as 0.1 µµ . can be detected by using 1 -hour counting times. Radium-226 is used as the standard and the results indicate about 100 to 110 % of the activity of the alpha-emitting radium isotopes as radium-223, radium-224, and radium-226. Considerableinterest in radioactivity in water has developed within the past several years. To the public health official and the waterworks engineer, radioactivity in the water supply is important as a possible health hazard. To the industrial engineer, it is a variable which may affect the quality of his industrial products. To the geologist and geochemist, it is a clue to subsurface conditions and processes.To the hydrologist, radioactivity in water is a potential tool for the study of water movement.Radium is a source of radioactivity in water. The isotope radium-226 is a member of the uranium series, radium-228 and radium-224 are members of the (7) Raben, M. S., Bloembergen, N.,

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Zur analytischen Bestimmung von Radium

Cited by 4 publications

References 2 publications

Radium

Radium

Der Aufschluß von Radiumsulfat mit Ionenaustauschharzen und die Abtrennung des Radiums D und Poloniums vom Radium

Modified Determination of Radium in Water

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