As of 2026-09-11 · the last 10 years
Chlorine’s research intensity currently sits at about 64% of its all-time peak, a level that has remained essentially flat over the last decade.
Research intensity ran from about 65% of the element's own all-time peak in 2016 to about 64% in 2026 — essentially flat across the window, and the all-time peak (1960) lies before this window. Over the same span its share of research attention across all elements rose. Among the 118 elements, chlorine has a larger-than-average research literature.
The number of papers involving the element rose from about 86,373 in 2016 to about 183,700 in 2025 (2.13x). That matches the growth of the literature as a whole over the same years: the general tide of scientific output, not a surge specific to the element.
The bulk of chlorine’s recent research is organized around the management of chlorine-containing pollutants and the protection of materials from chloride corrosion. The largest community, Dechlorination of PVC Waste and Polychlorinated Biphenyls, accounts for about 16% of the element's recent research and has held steady. This work focuses on reductive dechlorination processes and the thermal stability of PVC waste to manage pollutants, with chlorine serving as one strand of a broader community where about 19% of papers involve the element. A key paper in this area, "Microplastics and Nanoplastics in Atheromas and Cardiovascular Events" (2024), has been cited over 1,000 times, highlighting the intersection of plastic waste and health.
A similarly sized community, Chlorine Disinfection and By-Products in Water Distribution, represents about 15% of recent research and is also steady. Here, chlorine is central to the study of dosing, residual decay, and disinfection by-product formation in municipal systems, though it remains one strand of a broader water treatment field where about 13% of papers involve chlorine. The community is anchored by "Assessing the Use of Probes and Quenchers for Understanding the Reactive Species in Advanced Oxidation Processes" (2023), cited over 610 times.
In the materials sector, Chloride Ingress and Corrosion in Reinforced Concrete makes up about 7% of the element's recent research, a steady share. This community examines chloride binding and diffusion mechanisms that drive steel corrosion, where chlorine is a minor presence in a much larger field of low-carbon binders (about 5% of papers). "Durability Performance of Geopolymer Concrete: A Review" (2022), cited over 370 times, is a key reference here.
The only community showing a significant shift is Chloride-Induced Corrosion Inhibition in Mild Steel, which has declined from about 10% to 5% of the element's research. This work evaluates organic inhibitors for carbon steel in hydrochloric acid environments, where chlorine is one strand of a broader corrosion protection community (about 23% of papers). Recent work, such as "Investigations of corrosion inhibition of ethanolic extract of Dillenia suffruticosa leaves..." (2024), cited about 88 times, reflects this ongoing but shrinking focus.
The remainder of the literature, held by other smaller communities, accounts for about 57% of the element's recent research. For a deeper look at the current state of these fields, see the element's Last 12 Months and Executive Brief reports.
What changed in the past year: new papers, shifting applications, emerging collaborators. See the momentum over a shorter window than the decade view.
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