Analysierte PFAS – die Spitze des Eisbergs?

Held, T.; Reinhard, Michael

doi:10.37307/j.1864-8371.2016.05.03

Cited by 2 publications

(10 citation statements)

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“…In addition to diffuse discharges via the atmospheric pathway and the agricultural application of contaminated materials such as sewage sludge and residual materials from paper production, in recent decades there have been numerous, sometimes massive PFAS discharges into soil and groundwater through so-called point sources [61,62]. Aqueous Film Forming Foam (AFFF) with PFOS as film-forming agent is of particular importance in this context.…”

Section: Pfas-contaminated Sitesmentioning

confidence: 99%

“…Alternative treatment processes, however, are not yet technically mature [61,62]. Large-scale soil washing (on-site) is in its infancy for PFAS, as are in-situ remediation processes.…”

Section: Pfas-contaminated Sitesmentioning

confidence: 99%

“…Both, drinking water treatment and the remediation of contaminated groundwater, therefore, face major challenges. In a publication of the German UBA, Held and Reinhard give an overview of the different processes and their strengths and weaknesses [61,62]. As Li et al point out, treatment of short-chain PFAS is usually even less effective than for long-chain homologues [86].…”

Section: Purification Of Pfas-contaminated Watermentioning

confidence: 99%

“…For example, precipitation of the anionic PFAS with cationic liquid polymers such as perfluorAd R is suitable for this purpose [334][335][336]. The process of ozofractionation, in which fine ozone bubbles cause enrichment at interfaces and oxidation of precursors, is apparently effective [61,62,337]. The process is commercially available.…”

Section: Purification Of Pfas-contaminated Watermentioning

confidence: 99%

“…The process is commercially available. Furthermore, sonolysis, in which PFAS accumulate in cavitation bubbles that are formed under the influence of ultrasound, is an interesting approach [61,62].…”

Section: Purification Of Pfas-contaminated Watermentioning

confidence: 99%

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PFAS: forever chemicals—persistent, bioaccumulative and mobile. Reviewing the status and the need for their phase out and remediation of contaminated sites

Brunn

Arnold²,

Körner

et al. 2023

Environ Sci Eur

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Background Per- and polyfluorinated alkyl substances (PFAS) have received increasing scientific and political attention in recent years. Several thousand commercially produced compounds are used in numerous products and technical processes. Due to their extreme persistence in the environment, humans and all other life forms are, therefore, increasingly exposed to these substances. In the following review, PFAS will be examined comprehensively. Results The best studied PFAS are carboxylic and sulfonic acids with chain lengths of C4 to C14, particularly perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS). These substances are harmful to aquatic fauna, insects, and amphibians at concentrations of a few µg/L or less, accumulate in organisms, and biomagnify in food webs. Humans, as the final link in numerous food chains, are subjected to PFAS uptake primarily through food and drinking water. Several PFAS have multiple toxic effects, particularly affecting liver, kidney, thyroid, and the immune system. The latter effect is the basis for the establishment of a tolerable weekly dose of only 4.4 ng/kg body weight for the sum of the four representatives PFOA, PFOS, perfluorononanoic acid (PFNA) and perfluorohexane sulfonic acid (PFHxS) by the European Food Safety Authority (EFSA) in 2020. Exposure estimates and human biomonitoring show that this value is frequently reached, and in many cases exceeded. PFAS are a major challenge for analysis, especially of products and waste: single-substance analyses capture only a fragment of the large, diverse family of PFAS. As a consequence, sum parameters have gained increasing importance. The high mobility of per and polyfluorinated carboxylic and sulfonic acids makes soil and groundwater pollution at contaminated sites a problem. In general, short-chain PFAS are more mobile than long-chain ones. Processes for soil and groundwater purification and drinking water treatment are often ineffective and expensive. Recycling of PFAS-containing products such as paper and food packaging leads to carryover of the contaminants. Incineration requires high temperatures to completely destroy PFAS. After PFOA, PFOS and a few other perfluorinated carboxylic and sulfonic acids were regulated internationally, many manufacturers and users switched to other PFAS: short-chain representatives, per- and polyfluorinated oxo carboxylic acids, telomeric alcohols and acids. Analytical studies show an increase in environmental concentrations of these chemicals. Ultra-short PFAS (chain length C1–C3) have not been well studied. Among others, trifluoroacetic acid (TFA) is present globally in rapidly increasing concentrations. Conclusions The substitution of individual PFAS recognized as hazardous by other possibly equally hazardous PFAS with virtually unknown chronic toxicity can, therefore, not be a solution. The only answer is a switch to fluorine-free alternatives for all applications in which PFAS are not essential.

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Section: Pfas-contaminated Sitesmentioning

confidence: 99%

“…Alternative treatment processes, however, are not yet technically mature [61,62]. Large-scale soil washing (on-site) is in its infancy for PFAS, as are in-situ remediation processes.…”

Section: Pfas-contaminated Sitesmentioning

confidence: 99%