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:
- anthropogenic and natural sources (Figure 1). According to (10), 68.95% of chromium con-
- the sites affected, 56.43% had hexavalent chromium concentrations within the range of
- 0–10 mg/L. However, at sites with naturally occurring high concentrations of hexavalent
- chromium in groundwater, 75.00% exhibited levels below 0.2 mg/L. Wu et al. (11) collected
- data on chromium content from 1331 soil samples, with an average value of 85.01 mg/kg,
- range of 6.5 to 14, CrO4 2− dominates; at pH 0.7 to 6.5, HCrO4 − and Cr2 O7 2− prevail; below
- correlations between CEC and Cr(VI) content (r = −0.69, p < 0.05), acid-extractable Cr, and
- requires continuous application (31). In contrast, biochar possesses a stable aromatic carbon
- to hexavalent chromium are summarized in Table 1 (47–50).
- Table 1. Summary of tolerance and uptake capacity of selected plant species to hexavalent chromium.
- and geological matrix properties (Table 2).
- Table 2. The influence of various ions on hexavalent chromium and its mechanism.
- gence (p < 0.05) in microbial composition between low-Cr(VI) (<50 µg/L) and high-Cr(VI)
- (>50 µg/L) groundwater, with elevated diversity and richness under high Cr(VI) stress
- table (84). This submerges Cr(VI)-contaminated soil originally located in the unsaturated
- Immobilization of Chromium in Unsaturated Soil: Groundwater Table Fluctuations Induced by Rainfall. Chemosphere 2024, 365,
- during Groundwater Table Fluctuations Induced by Rainfall. J. Hazard. Mater. 2021, 416, 126229. (CrossRef)
-
- Wei, Y.; Chen, Y.; Cao, X.; Xiang, M.; Huang, Y.; Li, H. A Critical Review of Groundwater Table Fluctuation: Formation, Effects on
Methods (brief)
- chromium in groundwater, 75.00% exhibited levels below 0.2 mg/L. Wu et al. (11) collected
- data on chromium content from 1331 soil samples, with an average value of 85.01 mg/kg,
-
- Gonçalves, R.A.; Holmberg, K.; Lindman, B. Cationic Surfactants: A Review. J. Mol. Liq. 2023, 375, 121335. (CrossRef)
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.