New standard method raises the stakes for hydrogen quality monitoring

Hydrogen is often discussed as a production and infrastructure challenge, but for analytical and process-monitoring professionals the more immediate issue is often much simpler.

Can anyone prove that the hydrogen being sold, transferred or dispensed is clean enough for the application it is meant to serve? 

That is why the publication of ISO 14687:2025, Hydrogen fuel quality—Product specification matters. 

The new edition, published in February 2025, sets minimum quality characteristics for hydrogen fuel across residential, commercial, industrial, vehicular and stationary applications, replacing the 2019 edition and broadening the standard’s relevance beyond the narrower fuel-cell-vehicle framing that many engineers still associate with the topic. 

ISO also says the new edition introduces grades F-1 and F-2 for hydrogen internal combustion engines in vehicular and stationary applications.

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Gearing up for the hydrogen economy 

The U.S. Department of Energy notes that impurities in fuel and air are among the realistic operating stresses that affect fuel-cell durability, while NREL says fuel-cell systems are becoming increasingly susceptible to contaminants as catalyst loadings fall and membranes become thinner. 

In other words, hydrogen quality matters more as the technology becomes more commercially serious, not less. A hydrogen economy built on variable purity would not merely create inefficiency; it would directly threaten stack performance, reliability and lifetime.

That is where the instrumentation story begins. NPL, which provides hydrogen purity services and reference materials, lists the kinds of impurities that have to be tracked against ISO limits using different analytical techniques: water, total hydrocarbons, oxygen, helium, argon, nitrogen, carbon dioxide, carbon monoxide, total sulphur compounds, formaldehyde, formic acid, ammonia and total halogenated compounds. 

The methods span quartz crystal microbalance, cavity ring-down spectroscopy, gas chromatography with different detectors, FTIR, UV-visible spectroscopy and TD-GC-MS. NPL’s hydrogen-quality case study also notes that hydrogen refuelling stations must prove compliance with ISO 14687 against extremely low impurity limits and that doing so requires correct sampling, high-end gas analysis and reliable gas standards. 

That is what makes hydrogen quality such a demanding monitoring field: it is not one analyser measuring one parameter but a multi-method analytical regime operating close to trace-level detection.

The hydrogen-quality problem is increasingly shifting from the lab to the station and distribution interface. 

ISO 19880-8:2024, published in December 2024, specifies the protocol for ensuring the quality of gaseous hydrogen at hydrogen distribution facilities and fuelling stations for PEM fuel cells for road vehicles.

That makes it a key companion to ISO 14687. One standard defines the required product quality; the other addresses how that quality is controlled in the infrastructure that handles and dispenses it. This is a familiar logic in fuels and petrochemicals, where the most difficult failures often occur not because a specification is missing, but because product integrity is lost somewhere between production, storage, transfer and end use.

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The end of the lab

That is also why hydrogen-quality monitoring is changing. Historically, much of the work has depended on periodic sampling and laboratory confirmation. 

NPL’s case study on online hydrogen fuel-quality monitoring says the current approach, in which samples are taken from hydrogen refuelling stations and then analysed using sophisticated laboratory instruments, is expensive, complicated and slow to return results. 

That delay matters. If hydrogen is out of specification, operators do not just need an answer; they need it before contaminated product has moved through a distribution chain or into vehicles. The case for online and near-real-time monitoring is therefore growing not because laboratories are becoming less important, but because the commercial hydrogen system is becoming less tolerant of analytical delay.

Yet the standards landscape shows that this transition is still incomplete. ISO’s current work item ISO/AWI 21087 is aimed at validation protocols for analytical methods used to ensure hydrogen quality for PEM fuel-cell road vehicles, and it explicitly says it is mainly intended for laboratory analysis after sampling from distribution bases or refuelling stations. 

It also states that the specific requirements for online monitoring are not covered. That is an important detail for the market. It suggests that the analytical backbone of hydrogen quality assurance is still being formalised around post-sampling laboratory methods, even while industry interest is moving toward continuous or near-continuous assurance. 

For instrument developers, that gap is an opportunity; for operators, it is a reminder that online hydrogen analysis still needs careful validation against recognised laboratory methods.

For the petrochemical and alternative-fuels sector, that makes hydrogen quality a much more familiar story than the hype often suggests. This is not just a future-energy narrative. It is a matter of trace contaminant measurement, method validation, sample integrity, reference gas quality, analyser selection and proving agreement between offline and online data.

The technologies may differ from those used in conventional hydrocarbon service, but the underlying challenge is recognisable: a high-value product is only commercially useful if its quality can be demonstrated repeatably and close enough to the process to support operational decisions. ISO 14687:2025 sharpens that requirement by broadening the product-specification framework and acknowledging a wider set of hydrogen end uses.

So the real significance of ISO 14687:2025 is not merely that hydrogen now has an updated specification. It is that hydrogen is moving further into the world of routine industrial accountability.

The more hydrogen is sold as a serious fuel rather than a pilot-project curiosity, the less room there is for vague assumptions about purity. That puts analysers, metrology and fuel-quality assurance much closer to the centre of the market. In hydrogen, as in every other fuel sector, the commercial promise only becomes real when someone can measure it properly.