of major pollutants, including heavy metals, microplastics, persistent organic pollutants,

Overview

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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:

and mercury have decreased by 35–42% since 2013 following policy interventions like
60–90% at reduced costs. However, critical gaps remain in understanding chronic mixture
demand of South Africa. Agriculturally, the basin irrigates 40% of China’s arable land,
sion of 368 studies due to insufficient methodological detail (n = 142), geographic scope
outside the basin (n = 98), non-peer-reviewed status (n = 76), or data redundancy with
more comprehensive studies (n = 52). A total of 324 studies were retained for qualitative
following temporal distribution: 12% published between 1990 and 2005, 28% between 2006
and 2015, and 60% between 2016 and 2025. This distribution reflects the exponential growth
(n = 47), Environmental Pollution (n = 32), and Journal of Hazardous Materials (n = 28). This
contribute approximately 40% of total basin discharge, lack systematic contaminant moni-
median topsoil Cd concentrations of 2.1 mg kg−1 , approximately 3.5-fold higher than the
estimated 70% of metal-laden suspended particles in the reservoir. Fugacity-based fate
tions decline. Seasonal flood pulses remobilize an estimated 8–15% of sediment-bound
tions, which are the most bioavailable forms, constitute 15–45% of total Cd but only 3–8%
(≈ 64%), followed by vehicular emissions (≈22%) and biomass burning (≈14%). The
1500 to 17,800 particles m−3 , with fibers and fragments constituting 68% and 22%, respec-
25 ◦ C) fragment at rates of 12–18% mass loss per 90 days, potentially doubling particle
20–70% for particles < 500 µm (68). The absence of standardized reporting units (particles
sediment) exhibited significant reductions in filtration rate (32%) and condition index
(18%), suggesting sublethal population-level effects. Critically, these threshold-based
incomplete; cities such as Anqing and Jiujiang discharge > 30% of their wastewater with-
eralization of organic matter, potentially increasing sediment P flux by 40–70% during
increases of 8–15% in summer rainfall intensity, will amplify diffuse nutrient runoff from
increase by 30–45%, and the spatial extent of seasonal hypoxia in the Yangtze estuary may
framework. Basin-wide nutrient budgets indicate that approximately 65% of total nitro-
gen and 55% of total phosphorus entering the Yangtze originate from diffuse agricultural
sources, with the remaining fractions attributable to municipal wastewater (20–25% N,
30–35% P) and industrial discharge (10–15% N, 10% P) (38). A watershed-scale nutrient
reduction targets at 40–60% lower aggregate cost compared to uniform command-and-
single-substance assessments (Table 1). Sediment particles serve as common vectors
Table 1. Environmental contamination of the Yangtze River Delta and relevant sources causing soil,
7 million m3 d−1 of municipal wastewater; although 96% is now collected, only 65% re-
average dissolved Cd and Pb concentrations in the main stem declined by 42% and 38%,
further lowered industrial Zn loads by 55% in the Suzhou section. Nonetheless, legacy sed-
Yuan et al. (67) calculated an annual flux increase of 9.4% yr−1 from 2010 to 2020, mirroring
the monsoon season (June–August), when urban storm runoff delivers 60% of the annual
packaging now account for 47% of particles, up from 28% a decade ago. Environmental
Table 2. Summary of pollution indicator trajectories in the Yangtze Basin (2010–2022).
Highest in Shanghai Increase of 295% Plastic production
Microplastics estuary; storm-driven (2013–2022); 9.4% per growth; packaging Continuing (new)
Suzhou section Decline of 55% Permit system 2019 Wastewater
smelters (87). Basin-wide MEE monitoring shows that dissolved Cd declined by 42%

Methods (brief)

We propose an integrated basin-wide roadmap combining zero-liquid-discharge mandates,
system, several studies quantified PAH burdens in surface water and sediments collected
212 agricultural topsoil samples and detected atrazine, one of the most heavily applied
atrazine herbicides in China, in 89% of the samples at concentrations ranging from 0.8 to
Type of Sample Collection Type of Reference
Pollutants Point/Area Sample Study
Type of Sample Collection Type of Reference
Pollutants Point/Area Sample Study
7 million m3 d−1 of municipal wastewater; although 96% is now collected, only 65% re-
Pelteobagrus fulvidraco, Silurus asotus and Carassius auratus) collected along a 1200 km tran-
and quantitative PCR to profile soils collected from 15 electroplating-impacted sites in the
dominant pathway. Rice grain sampled across the Yangtze River Delta contained Cd levels
of 0.15–0.82 mg kg−1 , with 34% of samples exceeding the Chinese food-safety standard
A study by Chen et al. (91) analyzed pre- and posttreatment drinking water samples from
ter samples at levels up to 0.11 µg L−1 , approaching the European drinking water standard
collected 5 km upstream of the dam (pH 7.6, Eh −160 mV) and spiked with 50 µM each
below detection limits (LOD 0.05 µM), yielding stoichiometric amounts of phenol and 2,4-
Figure 7. Strategic roadmap for spatially differentiated, integrated basin management in the Yangtze

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 -layout was 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.

Commit	Date	Change	Description
b01ec52c	2026-08-04	major	2 sections added
d49e450f	2026-08-03	major	5 sections added; narrative text revised