Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For ion concentration
Patent
1995-03-02
1997-07-29
Tung, T.
Electrolysis: processes, compositions used therein, and methods
Electrolytic analysis or testing
For ion concentration
204403, 204416, 2057815, 422 8203, 436 8, 436 18, 436 79, G01N 27333
Patent
active
056518765
ABSTRACT:
The present invention is a reagent which, when added as a conditioning solution to samples containing calcium and magnesium, selectively converts the calcium into a complex which does not interfere with magnesium ISEs, and thus allows accurate magnesium determinations by ISE in a wide variety of samples. The conditioning solution also eliminates strontium and barium interferences by the same mechanism, but these are of secondary importance because they occur in samples less frequently and because they interfere less severely. Also, the formulation of the reagent was optimized solely in order to eliminate calcium interference and its ability to remove strontium and barium interferences was surprisingly fortuitous.
REFERENCES:
patent: 3754864 (1973-08-01), Gindler
patent: 4645744 (1987-02-01), Charlton et al.
patent: 5264348 (1993-11-01), Schick et al.
Rouilly et al, "Natural Ionophore-Based Selective Electrode for Assaying the Activity of Magnesium in Undiluted Blood Serum", Clinical Chemistry, vol. 36, No. 3, pp. 466-469, (1990).
Eugter et al, "Characterization Procedure for Ion-Selective Electrode Assays of Magnesium Activity in Aqueous Solutions of Physiological Composition", Clin. Chem., 39/5, pp. 855-859, (1993).
Tsagatakis John K.
Wen Xiaowen
West Steven J.
Linek Ernest V.
Orion Research Inc.
Tung T.
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