L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

L'air Liquide

V.g. Elemental Limited

Eric Coffre

Yves Marot

Gerard Loiseau

Robert Hutton

Gerard Torelli

Christophe Di Giulio

Martine Bridenne

Daniel Gary

Improvement to the process of elementary analysis of a specimen by high frequency inductively coupled plasma mass spectrometry, by means of an apparatus including a torch for producing plasma from a plasma producing medium and for injecting the specimen in this plasma and an interface for taking a sample in the specimen, comprising two consecutive conical members disposed along the same axis except that the conical members have angles with different apices and are each provided with an axial orifice enabling a fraction of the specimen to be analyzed to pass therethrough. According to the invention, a given quantity of a make-up gas is added to the specimen which is injected into the plasma, the make-up gas having a high heat producing power, so as to raise the temperature of the plasma for locally heating the sampling conical members thereby preventing the components of the specimen which are present in the plasma from depositing on the conical members. Preferably, the sampling conical members (18,19) are made of an alloy of niobium, hafnium, titanium.

Process for the elementary analysis of a specimen by high frequency

A pressure reducer, especially adapted for the supply of very pure gas in the electronics industry, which comprises a final stage having an inlet, pressure-reducing means and a low-pressure outlet. A filter having a filtration threshold lower than a micron is interposed between the pressure-reducing means and the low pressure outlet.

Pressure reducer for pure gases

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Trappes, France

Eric Coffre