Method for the detection of fluoride or hydrogen fluoride...

G - Physics – 01 – N

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G01N 33/53 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2495558

The invention relates to a method for the detection and/or dosing of fluoride (F-) or hydrogen fluoride (HF) in a sample, comprising stages consisting in placing the sample in contact with a silylated organic compound in an aqueous solution in order to obtain a measuring solution, said organic silyl compound being desilylated when it is in the presence of fluoride or hydrofluoric acid, whereby the silylated organic compound and the deilsylated organic compound can be detected and/or dosed in a distinct manner; and in detecting and/or dosing in said measuring solution the appearance of the desilylated organic compound or the disappearance of the organic silylated compound which occurs if fluoride or hydrogen fluoride is present in the sample. The invention makes it possible to detect in a very practical and easy manner the presence of hydrogen fluoride or fluoride in concentrations of 10-?2¿ 1 of HF / 10?6¿ 1 air (10 ppb), or even 0.5 to 1 ?g/ml in HF in a solution. The inventive kit comprises the elements which are required to carry out said method. The inventive method makes it possible to detect fluoride in concentrations of 0,001?g/ml.

La présente invention se rapporte à un Procédé de détection et/ou de dosage de fluorure (F-) ou de fluorure d'hydrogène (HF) dans un échantillon comprenant les étapes consistant à mettre en contact en solution aqueuse ledit échantillon avec un composé organique silylé pour obtenir une solution de mesure, ledit composé organique silylé étant désilylé lorsqu'il est en présence d'acide fluorhydrique ou de fluorure, le composé organique silylé et le composé organique désilylé pouvant être détectés et/ou dosés distinctement l'un de l'autre; et détecter et/ou doser dans ladite solution de mesure l'apparition du composé organique désilylé ou la disparition du composé organique silylé qui a lieu si du fluorure ou du fluorure d'hydrogène est présent dans l'échantillon. Il permet de détecter très pratiquement et aisément la présence de fluorure d'hydrogène ou de fluor à des concentrations de 10-2 1 de HF / 106 1 d'air (10 ppb), ou encore de 0,5 à 1 ~g/ml en HF en solution. La trousse de la présente invention comprend les éléments nécessaires à la mise en ouvre de ce procédé. Le procédé de l'invention permet de détecter du fluor à des concentrations de l'ordre de 0,001~g/ml.

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