Chemistry: analytical and immunological testing – Including chromatography
Patent
1995-03-03
1996-11-05
Snay, Jeffrey
Chemistry: analytical and immunological testing
Including chromatography
436 79, 436110, 436124, 436125, 436175, 436177, 436178, 73 6155, 210656, 210660, G01N 3002, G01N 3096
Patent
active
055717250
ABSTRACT:
Selected polyvalent anions or cations are removed from a liquid sample stream as a pretreatment for the analysis of the liquid sample stream. A stream containing anions of interest, precipitable anions (e.g. sulfate ions) to be removed and an added displacing salt flow through a first cation exchange resin bed having precipitable exchangeable polyvalent ions (e.g. barium ions). Displacing polyvalent cation (e.g. calcium) displaces the exchangeable polyvalent ion from the cation exchange resin into the liquid sample at sufficient concentration to cause the precipitable anion and exchangeable cation to form a precipitate which remains in the resin bed and is thus is removed from the sample stream. Then the anions of interest in the soluble portion of the liquid sample stream are separated and detected. The invention is also applicable to the removal of precipitable cations (e.g. barium ions) by reversing the roles of the anions and cations.
REFERENCES:
patent: 3926559 (1975-12-01), Stevens
patent: 4357143 (1982-11-01), Scott
patent: 4814281 (1989-03-01), Byers
patent: 5227053 (1993-07-01), Brym
Alltech Bulletin #264.
Joyce et al. (1994) J. Chromatog. 165-171.
Alltech Data Sheet #D70264.
Dhillon Harpreet S.
Pohl Christopher A.
Siriraks Archava
Slingsby Rosanne W.
Dionex Corporation
Ludlow Jan M.
Snay Jeffrey
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