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Simultaneous spectrophotometric estimation of thorium and calcium in urine
M V Prasad1, D S Suryanarayana, R K Jeevanram
1Safety Research & Health Physics Programme, Indira Gandhi Centre for Atomic Research, Kalpakkam, India.
International Journal of Radiation Applications and Instrumentation. Part A, Applied Radiation and Isotopes
|June 1, 1992
Abstract:
A simple and rapid method for the simultaneous estimation of thorium and calcium in urine was developed. Thorium and calcium were coprecipitated as oxalates at pH 3-4 and were determined using Thoronol as reagent. A multi-wave-length linear regression analysis procedure was applied. Thorium recovery was found to be 78.3% +/- 5.1% (1 sigma) and that of calcium was 93.7 +/- 3.0% (1 sigma). The minimum detection limit for thorium was found to be 2.54 mBq/dm3. The analytical results of calcium agree very well with those determined by EDTA titrimetry.