Summary
Secondary analysis of public drinking-water monitoring. This is a reuse of monitoring data, not a new sampling campaign. Selected maxima only; exposure models and regulatory comparisons are excluded.
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.
| analyte | value | unit | basis | source location | limits and qualifiers |
|---|---|---|---|---|---|
| PFOA | 349 | ng/L | maximum in reused public-supply monitoring data | PDF p3, Results and Discussion, paragraph beginning Six million | PFOA MRL 20 ng/L; PFOS MRL 40 ng/L; PFNA MRL 20 ng/L (PDF p3 Table 1). |
| PFOS | 1800 | ng/L | maximum in reused public-supply monitoring data | PDF p3, Results and Discussion, paragraph beginning Six million | PFOA MRL 20 ng/L; PFOS MRL 40 ng/L; PFNA MRL 20 ng/L (PDF p3 Table 1). |
| PFNA | 56 | ng/L | maximum in reused public-supply monitoring data | PDF p3, Results and Discussion, paragraph beginning Six million | PFOA MRL 20 ng/L; PFOS MRL 40 ng/L; PFNA MRL 20 ng/L (PDF p3 Table 1). |
Evidence Fitness
Source classification: secondary_monitoring_analysis. 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)
UCMR monitoring dataset and analyte scope: PDF p2, Methods; reporting levels: PDF p3 Table 1. The analytical assay is not independently revalidated here.
Detection limits and censoring: PFOA MRL 20 ng/L; PFOS MRL 40 ng/L; PFNA MRL 20 ng/L (PDF p3 Table 1).
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: 2016_Hu_detection-of-poly-and-perfluoroalkyl-substances.pdf. SHA-256: 0222d4bcda7c838a485c90f8c9890017aee55ce4788f67234e3346df9175db97. 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.