A tested product is not the same as method approval
Water and acetonitrile for PFAS analysis should be assessed against the manufacturer’s stated tests and specifications. A statement that a product passes EPA 533/537.1 tests does not mean EPA separately approves that commercial product or guarantees the same result in every laboratory application.
Scharlab’s relevant range addresses analyses requiring low background. Select the exact product code by reviewing current technical documentation alongside the laboratory’s method requirements.
Do not extend drinking-water scope to every matrix
EPA Methods 533 and 537.1 were developed for PFAS analysis in drinking water. Their names on a product page do not automatically establish suitability for wastewater, soil or food. Confirm target analytes, sample type and quality-control requirements in the applicable method.
Blank assessment is part of product acceptance
Containers, caps, preparation materials and the analytical system can contribute background in addition to the solvent. Changing the bottle alone may therefore leave the source of contamination unresolved. Choose materials and blank types according to the laboratory’s applicable method.
- Review the manufacturer’s test statement and any stated detection limit.
- Link product and lot identity to blank records.
- Assess a new lot against method acceptance criteria before use.
Do not interpret PFAS-free as an absolute zero
An absence claim must be read within the tested compound scope and the method’s measurement capability. It does not establish that every PFAS is absolutely absent under all conditions. For a quotation, specify the method version, target analytes, required water or acetonitrile, packaging and documentation scope.
Sources
Primary and institutional sources consulted in preparing this article.
Weltnexx Editorial TeamExpert content on European sourcing, laboratory products and technical documentation.Image credit: James Reynolds / USGS · Source · Public Domain (source declaration)
