Summary
Archived household tap-water measurements. Linear and branched isomers remain distinct. Medians and interquartile ranges are for detected samples only. Plasma measurements and modeled contributions are excluded. PFDA and PFBS descriptive rows remain valid as printed, but the paper excludes these analytes from downstream analyses because of nondetection frequency (p3).
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 | 0.57 (0.33, 1.36) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, nPFOA | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFOA | 0.39 (0.17, 0.51) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, brPFOA | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFNA | 0.23 (0.13, 0.29) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, nPFNA | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFNA | 0.19 (0.10, 0.34) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, brPFNA | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFDA | 0.22 (0.19, 0.94) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, PFDA | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFBS | 0.20 (0.19, 0.25) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, PFBS | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFHxS | 0.51 (0.23, 1.43) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, nPFHxS | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFHxS | 0.44 (0.18, 0.99) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, brPFHxS | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFOS | 0.69 (0.29, 1.80) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, nPFOS | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
| PFOS | 0.94 (0.51, 2.04) | ng/L | median (IQR), detected archived tap-water samples only | PDF p3, Table 2, brPFOS | Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3). |
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 and triple-quadrupole LC-MS/MS; target scope and isomer calibration in PDF pp2-3. EOF measured by combustion ion chromatography is a separate assay (p5).
Detection limits and censoring: Analyte-specific water LODs are in unstaged Table S3. Table 2 statistics use samples above LOD only; downstream analyses use ROS imputation (p3).
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: 2019_Hu_tap-water-contributions-to-plasma-concentrations.pdf. SHA-256: d76901c1fb80b7402839b138078f1af87bd467b91b0c226355b94515bad4d74a. 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.