title: Simultaneous spectrophotometric estimation of thorium and calcium in urine.
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.
authors.affiliation: Safety Research & Health Physics Programme, Indira Gandhi Centre for Atomic Research, Kalpakkam, India.
authors.forename: M V
authors.initials: MV
authors.lastname: Prasad
authors.forename: D S
authors.initials: DS
authors.lastname: Suryanarayana
authors.forename: R K
authors.initials: RK
authors.lastname: Jeevanram
mesh_terms: D002118:Calcium / Q000652:urine*; D006801:Humans; D013053:Spectrophotometry / Q000379:methods; D013910:Thorium / Q000652:urine*
chemical_list: D013910:Thorium; D002118:Calcium