Chemistry: analytical and immunological testing – Metal or metal containing – Li – na – k – rb – cs – fr – be – mg – ca – sr – ba – ra
Patent
1985-09-13
1988-08-09
Richman, Barry S.
Chemistry: analytical and immunological testing
Metal or metal containing
Li, na, k, rb, cs, fr, be, mg, ca, sr, ba, ra
422 58, 422 68, 436 74, 436172, G01N 2177, G01N 3320
Patent
active
047627999
ABSTRACT:
The concentration of a selected alkali metal cation in an aqueous sample is determined using an aqueous fill solution containing a dissolved polymeric cationic material (e.g., copper--PEI) and a dissolved fluorescent anionic material (e.g., ANS) and, in contact with the fill solution, an ionophore selective for the selected alkali metal cation. The aqueous fill solution is contacted with an aqueous sample through a membrane, the membrane being permeable to alkali metal cations, but impermeable to the polymeric cationic material. Fluorescence is detected either from molecules of fluorescent anionic material which have migrated from adjacent to the polymeric cationic material to adjacent to ionophore-complexed alkali metal cations or from molecules of fluorescent anionic material which have remained adjacent to the polymeric cationic material, or from both, especially through a fiber optic.
REFERENCES:
patent: 4256834 (1981-03-01), Zuk et al.
patent: 4272485 (1981-06-01), Lubbers
patent: 4548907 (1985-10-01), Seitz et al.
patent: 4552697 (1985-11-01), Yip et al.
patent: 4649123 (1987-03-01), Charlton et al.
Freeman et al., Anal. Chem. vol. 50, No. 9; Aug. 1978 pp. :1242-1246.
Mullin Jerome
Seitz William R.
Zhujun Zhang
Doernberg Alan M.
Fisher Scientific Company
Hill Jr. Robert J.
Richman Barry S.
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