Patent ID: 8288161

Claim:
A method of calibrating a measurement device for measuring a concentration of an acid gas, the method comprising the steps of: A) providing an article of manufacture comprising: a) a container having an internal space and a passivated internal metal surface; and b) a composition comprising an acid gas and a balance gas contained within the internal space and in contact with the passivated internal metal surface; wherein i) the acid gas has an intended concentration in the balance gas of less than 500 ppb; ii) the acid gas is selected from the group consisting of carbon disulfide, carbonylsulfide, and compounds within the formula Yâ€”Sâ€”X wherein S is sulfur, X and Y are the same or different and are independently selected from the group consisting of hydrogen, alkyl, aryl, oxygen, hydroxyl, amine, aminosilane, oxygen, and alcohol; and iii) the passivated internal metal surface comprises I) the reaction product of a silicon-containing material and an oxygen-containing material, and II) an amount of the acid gas adsorbed on or in the passivated internal metal surface is at least 500 times greater than the intended concentration of the acid gas that is to be substantially maintained in the composition, which is effective to enhance the stability of the intended concentration over time; B) using a portion of the acid gas contained within the article of manufacture in a calibration of the measurement device; and C) repeating said step B) at least once, wherein a period of time commencing from a first performance of said step B) and expiring on a later repetition of said step B) is not less than 30 days.