Summary
Tap-water sampling in the southern key economic region of Vietnam. MANIFEST geography says China; the PDF identifies Vietnamese provinces. The discrepancy remains logged.
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 | 0.03-0.76 | ng/L | reported detected concentration range; source method has panel LOQ range | PDF p4, section 3.1 | LOD 0.02 to 0.05 ng/L; LOQ 0.05 to 0.17 ng/L (panel ranges), PDF p3. Do not assign a panel endpoint to an individual analyte. |
| PFOS | 0.06-0.82 | ng/L | reported detected concentration range; source method has panel LOQ range | PDF p4, section 3.1 | LOD 0.02 to 0.05 ng/L; LOQ 0.05 to 0.17 ng/L (panel ranges), PDF p3. Do not assign a panel endpoint to an individual analyte. |
Evidence Fitness
Source classification: primary_measurement. MANIFEST tier: PRIMARY. 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)
SPE-UPLC-MS/MS, PDF p3 section 2.2; target panel in Table 1.
Detection limits and censoring: LOD 0.02 to 0.05 ng/L; LOQ 0.05 to 0.17 ng/L (panel ranges), PDF p3. Do not assign a panel endpoint to an individual analyte.
Limitations
- MANIFEST_MATRIX_GEOGRAPHY: MANIFEST describes region as China. Comparison: PDF identifies Vietnam and named Vietnamese provinces. Locator: PDF pp1-2 and sample locations pp5-6. Retain MANIFEST unchanged; PDF geography governs draft description; HOLD discrepancy.
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: 2025_TRAN_perfluoroalkyl-and-polyfluoroalkyl-pfas-in-tap.pdf. SHA-256: 2901df51b1e75a8df9533ccd011207d7ae1aa56d2c9f2bc1684731b200fb9f06. 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.