B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 35/143 (2006.01) A61L 2/28 (2006.01) B01J 47/14 (2006.01) C02F 1/00 (2006.01)
Patent
CA 2271969
A method of monitoring the removal by a filter medium of a target substance from a liquid passing through the filter medium. The method involves: providing an indicator means; providing a filter medium having a plurality of binding sites which have a first affinity for the target substance and a second affinity for the indicator means; introducing the indicator means into the liquid; passing the liquid through the filter medium; and determining the presence or absence of the indicator means in the liquid which has passed through the filter medium. The first and second affinities are adapted to require binding of the indicator means by the filter medium only so long as binding sites are available to the target substance. Thus, the indicator means is adapted to compete with the target substance. As a practical matter, the liquid typically will be water. The indicator means may denote when the filter medium is not effective by altering the taste of the water passing through the filter medium. Alternatively, the indicator means may denote when the filter medium is not effective by altering the color of the water passing through the filter medium. For example, the indicator means may impart a color to the water passing through the filter medium.
L'invention a trait à un procédé de contrôle de l'extraction par un milieu filtrant d'une substance cible dans un liquide traversant ledit milieu filtrant. Ce procédé fait intervenir un indicateur et un milieu filtrant possédant plusieurs sites de fixation ayant une première affinité pour la substance cible et une seconde pour l'indicateur. On introduit l'indicateur dans le liquide, ou fait passer le liquide par le milieu filtrant et l'on vérifie la présence ou l'absence de l'indicateur dans le liquide ayant traversé le milieu filtrant. Les deux affinités sont conçues pour ne provoquer de fixation de l'indicateur par le milieu filtrant que tant qu'il existe des sites de fixation disponibles pour la substance cible. De la sorte, l'indicateur est à même d'entrer en concurrence avec la substance cible. Le liquide est, d'ordinaire, de l'eau. L'indicateur peut signaler l'inefficacité du milieu filtrant en modifiant le goût de l'eau traversant ce milieu ou, dans une variante, en changeant la couleur de cette eau. Il peut, par exemple, colorer l'eau traversant le milieu filtrant.
Borden Ladner Gervais Llp
Kimberly-Clark Worldwide Inc.
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