Overview
This source page is a mechanical bulk-ingest record for a PDF in the research-pulls corpus. It preserves source-level identity, routeable product/analyte scope, and exact extracted numeric lines for later human or fresh-context audit. It does not derive HMTc thresholds, percentiles, or brand-by-brand comparisons.
Key numbers
The worker extracted the full PDF text with layout preservation twice and compared extraction hashes before commit. The following lines are copied from numeric/table-bearing regions of the PDF and retain the source units and wording where legible:
- the maximum acceptable level of 5.0 × 10−5 a−1 , with Cu, Mo, Ba, and V contributing
- one per ten routine samples (10%). For ICP–MS analysis, multi-point external calibration
- in Table 1, and the analytical methods, instruments, and QA/QC procedures are presented
- Table 1. Method detection limits (MDLs) of trace metals/metalloids analyzed in this study (µg/L).
- Table 2. Analytical methods, instruments, and QA/QC procedures for trace metals/metalloids.
- verification; duplicates (10%) indicate one duplicate sample per 10 routine samples.
- MDLs (Table 1) and therefore were excluded from the quantitative health-risk assessment
- in their models were selected as shown in Table 3 (7,38,47).
- Table 3. Heavy metal carcinogenicity intensity coefficient and non-carcinogenic reference dose.
- lation function (ACF) and partial autocorrelation function (PACF) plots (95% confidence
- considered acceptable when the residual autocorrelations fell within the 95% confidence
- Figure 3. Paired Comparison Plot of heavy metals in the study area. This figure displays the mean
- counts for more than 90% of the average annual non-carcinogenic health risk assessment,
- Reservoir, with a Cr(VI) mass concentration of 0.025 mg/L in May 2022; the lowest carcinogenic
- carcinogenic risks than adults, see Table 4 (4,53–56).
- Table 4. Comparison of carcinogenic risks of heavy metals in drinking water and surface water across
- also exceeded the maximum acceptable risk level of 1.0 × 10−6 a−1 recommended by the
- intake in children at three drinking water sources, as shown in Table 5. The statistical
- both greater than the critical values of 1%, 5%, and 10%, and the p-values were 0.26 and
- values t of −8.4 and −10.7, respectively, both less than the critical values of 1%, 5%, and
- 10%, and p-values of 0.00 and 0.00, respectively, less than 0.05 and 0.01. The null hypothesis
- statistical value t is −4.4, less than the critical values of 1%, 5%, and 10%, the p-value is
- Table 5. ADF test statistical table.
- 95% confidence interval. From Figure 6a,d, it can be seen that the correlation coefficient
- standard deviations, that is, both are within the 95% confidence interval. From Figure 6a, it
- deviation limit (95% confidence interval) of two times. As shown in Figure 6c,f, the q value
- −1 to 1), with the shaded area indicating the 95% confidence interval. ACF (a–c) = Autocorrela-
- As shown in Figure 6 and Table 6. To further verify the adaptability of the selected
- water source models are all within the 95% confidence interval, and the residual sequences
- The filled parts are the 95% confidence intervals, and the predicted carcinogenic risk results for
Methods (brief)
- sources, and the water samples were more representative.
- of water samples were performed according to the “Water Quality Sampling—Technical
- Regulation of the Preservation and Handling of Samples” (HJ 493-2009) (35).
- spectrometry (ICP–MS; Agilent 7800 ICP–MS, Agilent Technologies, Santa Clara, CA, USA)
- Field-coded samples, full-procedure blanks, and parallel samples were included dur-
- ing sampling and analysis. Duplicate (parallel) samples were analyzed at a frequency of
- one per ten routine samples (10%). For ICP–MS analysis, multi-point external calibration
- Agilent 7800 ICP–MS (Agilent internal standards;
- Mn, Mo, Co, Be, B, ICP–MS HJ 700-2014
- Note: ICP–MS, inductively coupled plasma–mass spectrometry; UV–Vis, ultraviolet–visible spectrophotometry;
- verification; duplicates (10%) indicate one duplicate sample per 10 routine samples.
- a non-parametric test for comparing multiple independent groups). p ≥ 0.05: The samples come
- from the same population, the populations are not significantly different. p < 0.05: The samples
-
- HJ 494–2009; Water Quality—Determination of Cadmium by Graphite Furnace Atomic Absorption Spectrometry. China
-
- HJ 493–2009; Water Quality—Determination of Lead by Graphite Furnace Atomic Absorption Spectrometry. China Environmental
-
- HJ 700–2014; Water Quality—Determination of 65 Elements—Inductively Coupled Plasma Mass Spectrometry. China Environ-
Implications
This page makes the source discoverable for category-level evidence routing. Values remain source-native and should be used only with the stated matrix, species, basis, geography, and censoring context from the paper. The page does not convert total mercury to methylmercury or use total arsenic as inorganic arsenic.
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Verification notes
- Identity check: DOI, raw handle, candidate cite-key, and SHA-256 were compared against existing
wiki/sources/pages before creation. - Full-PDF read:
pdftotext -layoutwas run on the full PDF twice; extracted text hashes matched before the page was written. - Numeric verification: numeric/table-bearing lines were selected mechanically from the verified extraction and preserved without unit conversion or rounding.
- Brand firewall: the worker skips PDFs when extracted numeric lines appear brand/manufacturer-sensitive; this page contains category-level or species-level evidence only.
- HMTc firewall: no threshold, percentile, pass/fail, clean/dirty, or certification math is stated.
Update history
The five most recent substantive edits to this page, classified major (evidence or structure moved), correction (a published value or statement was wrong and has been fixed), or minor (narrative rewritten without changing the underlying evidence). Each description is derived from what the edit did to this page; the linked commit is the authoritative record, routine regeneration passes are excluded, and the full version history lives in git. When DOI minting comes online (see schema docs), each entry below will also link to a version-pinned DataCite DOI.