Summary
Groundwater used as a drinking-water source. This record is supportive source-water context and does not supply finished tap-water concentration rows.
Key numbers
Source-reported values checked against the cited page of the filed PDF. Values are reported as printed, without conversion. These are selected records, not an exhaustive transcription.
No values from this source are published. It is filed as method or context evidence.
Evidence Fitness
Source classification: source_water_measurement. MANIFEST tier: SUPPORTIVE. This is a selected, bounded transcription, not an exhaustive extraction of every result in the paper. Each selected number has its own PDF page or table locator. Values for different matrices, isomers, statistics and aggregate assays are not interchangeable.
Methods (brief)
Liquid chromatography/tandem mass spectrometry with isotope dilution, PDF p2; detailed panel and method in unstaged SI Section S2.
Detection limits and censoring: Quality control and reporting limits depend on the source method and unstaged supplementary tables; not inferred for finished tap water.
Limitations
Provenance notes
Citation metadata verified against PDF p1, title, author byline, journal citation or masthead, and DOI.. Article DOI appears in the supplied PDF and matches the MANIFEST case-insensitively. Original file: 2022_McMahon_perfluoroalkyl-and-polyfluoroalkyl-substances-in-groundwater.pdf. SHA-256: 164c737af3ef2c79ff9f2d1d1b6b644c8c890a35fc07bfaa3340c9abdd45d85d. Original MANIFEST remains in the copied packet; discrepancies are listed without modifying it. Commercial analyte synonyms, instrument brands and manufacturer names are generalized in authored index prose.