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Determination of strontium-90 in Milk Samples Using a Controlled Precipitation Clean-Up Step Prior to Ion-Chromatography

Determination of strontium-90 in Milk Samples Using a Controlled Precipitation Clean-Up Step Prior to Ion-Chromatography

J Cobb, P Warwick, R C Carpenter, R T Morrison

Sci Total Environ. 1995 Dec 1;173-174:179-86.

PMID: 8560223

Abstract:

Strontium-90 may be determined by beta-counting its yttrium-90 daughter following separation by ion-chromatography, using a three column system comprising a chelating concentrator column, a cation-exchange column and an anion-exchange separator column. The column system has previously been applied to the determination of strontium-90 in water and urine samples. The applicability of the system to the analysis of milk is hampered by the large concentrations of calcium present, which significantly reduces the extraction of yttrium-90 by the concentrator column. A maximum of approximately 200 mg of calcium can be present for the successful extraction of yttrium-90, which greatly limits the quantity of milk that can be analysed. The quantity of milk analysed can be increased by the inclusion of a controlled precipitation step prior to the ion-chromatographic separation. The precipitation is carried out on acid digested milk samples by the addition of ammonia solution until the addition of one drop causes a reduction in pH resulting in the precipitation of calcium hydrogenphosphate. Under these conditions, approximately 20% of the calcium present in the original milk sample is precipitated, yttrium-90 is precipitated whereas strontium-90 is not precipitated. Dissolution of the precipitate, followed by separation of yttrium-90 using the ion-chromatography system facilitates the analysis of a litre of milk with recoveries of greater than 80%.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13450992	Strontium hydrogenphosphate		13450-99-2	Price

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