This paper describes a new procedure for the direct determination of uranium In plutonium solutions using tlme-reeoived spectrofluorometry. The analytical method is based upon the use of sulfuric add as a dilution medium and leads to a detection limit of U/Pu = 0.2 ppm. A formula taking Into account both quenching and Inner-filter effects Is presented. It permits the calculation of the detection limit of uranium In complex solutions and could be used to obtain a theoretical limit of detection for similar applications.
SynopsisA combination of chain and step propagations is being used to prepare a series of segmented copolymers containing polyoxyethylene and polypivalolactone segments each with narrow molecular weight distributions. The incompatibility of the two segments coupled with the difference in surface energies of the two segments could result in good phase separation with the polyoxyethylene segment thereby being found on the surface. Poly(oxyethy1ene)-co-(pivalolactone) telechelomer, which is the precursor to the segmented copolymer, is used as a model to develop an XPS method for surface analysis. An angular resolution study shows that negligible amounts of poly(pivalo1actone) segments are present near the surface. Core level spectra of the telechelomer and its model compounds are presented to indicate that poly(oxyethy1ene) segment is richer near the surface.
1) Mlyaishi, K.; Kunlake, M.; Imasaka, T.; Ogawa, T.; Ishibashi, N. Anal. (2) Bradley, A,; Zare, R. J. Am. Chem. SOC. 1976, 98, 620. (3) Hirshfeld, T. Appl. Opt. 1976, 15, 2965-2966. (4) Dovlchl, N.; Martin, J. C.; Jett, J. H.; Trkula, M.; Keller, R. A.
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