Reference materials at emission levels of NH 3 and HCl

Wijk, Janneke I T van; Nieuwenkamp, Gerard; Hafkenscheid, T.L.

doi:10.1007/s002160100825

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2019

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“…The mixture was analysed using CRDS technique (Cavity Ring Down Spectroscopy) resulting 45.5 µmol/mol, that was fairly consistent with the gravimetric value 55.2 µmol/mol [9]. The discrepancy could be evidenced because of the lack of stability of these mixtures that leads to recommend the use of cylinders with an adequate internal wall treatment [10,11].…”

Section: Resultsmentioning

confidence: 73%

Preparation of hydrogen chloride in hydrogen standard gas mixtures for hydrogen purity requirements

Rojo

Santamaría

2019

19th International Congress of Metrology (CIM2019)

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The hydrogen gas dispensed as fuel in refuelling stations for Fuel Cell Electric Vehicles (FCEV) should meet with purity requirements according to the actual normative. In this report we approach the preparation of hydrogen chloride/hydrogen (HCl/H2) standard gas mixtures, required to support the purity analysis of hydrogen fuel. The preparation of these mixtures was perform according to the gravimetric method, using dilution steps to reach the concentration level of 10 µmol/mol as the lowest. The mixtures were prepared in 5 L aluminium alloy cylinders with no internal treatment.

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Section: Resultsmentioning

confidence: 73%