Department Environmental Chemistry

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   0 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=36938, pid=124)
      originalId => protected36938 (integer)
      authors => protected'Chow, S. J.; Braxmaier, E.-M.; Haffter, F.; McArdell,&nb
         sp;C. S.; Hollender, J.' (109 chars)
      title => protected'Wide-spectrum target and total oxidizable precursor PFAS quantification with
          online enrichment and LC-HRMS: overcoming analytical and matrix complexity 
         in wastewater and sludge' (176 chars)
      journal => protected'Journal of Hazardous Materials' (30 chars)
      year => protected2026 (integer)
      volume => protected514 (integer)
      issue => protected'' (0 chars)
      startpage => protected'142842 (15 pp.)' (15 chars)
      otherpage => protected'' (0 chars)
      categories => protected'PFASs; high-resolution mass spectrometry; wastewater; sludge; total oxidizab
         le precursor assay; online solid-phase extraction; ion competition' (142 chars)
      description => protected'Monitoring chemically diverse per- and polyfluoroalkyl substances (PFASs) in
          complex environmental matrices requires robust, streamlined analytical work
         flows. This study developed a high-throughput peak-focusing online solid-pha
         se extraction (SPE) liquid chromatography high-resolution mass spectrometry 
         (LC-HRMS) workflow to quantify 63 PFASs (n<sub>CF</sub> = 1–17, excludin
         g trifluoroacetic acid) in wastewater, sludge, and total oxidizable precurso
         r (TOP) assay samples. Underreported analytical challenges including HRMS is
         obars and precursor leaching from micropipette tips were investigated. Co-ex
         tracted matrix constituents, tentatively identified as linear alkylbenzene s
         ulfonates and long-chain fatty acids, induced Orbitrap-specific ion competit
         ion that hindered quantification of long-chain PFASs in influent and sludge.
          Splitting the MS scan into two time- and mass-dependent ranges mitigated th
         ese effects and restored analyte sensitivity while maintaining full-scan cap
         abilities. Validation using contemporary samples from two wastewater treatme
         nt plants (WWTPs) and legacy NIST SRM 2781 sludge demonstrated high reproduc
         ibility (intra-batch precision 8–17% for 95% of analytes). Median matrix l
         imits of quantification were 2.5 ng/L (influent), 1 ng/L (effluent), and
          1 ng/g (sludge). WWTP measurements revealed zwitterionic 6:2 fluorotelome
         r sulfonamide alkylbetaine (6:2 FTAB) as a dominant precursor in wastewater 
         (max 405 ng/L) and sludge (max 60 ng/g), exceeding concentrations of ubi
         quitous perfluorocarboxylic acids (PFCAs), perfluorooctane sulfonic acid (PF
         OS), and other legacy PFASs. TOP assay results revealed substantial unknown 
         precursor gaps, particularly in sludges where &gt; 90% of oxidizable PFAS 
         mass could not be explained by target precursors. To fill such PFAS mass gap
         s, this scalable full-scan analytical approach can readily accommodate new t
         arget analytes and provide valuable HRMS data for retrospective screening.' (1974 chars)
      serialnumber => protected'0304-3894' (9 chars)
      doi => protected'10.1016/j.jhazmat.2026.142842' (29 chars)
      uid => protected36938 (integer)
      _localizedUid => protected36938 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected36938 (integer)modified
      pid => protected124 (integer)
   1 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=36410, pid=124)
      originalId => protected36410 (integer)
      authors => protected'Rougé,&nbsp;V.; Dax,&nbsp;A.; Köster,&nbsp;O.; von Gunten,&nbsp;U.; Jansse
         n,&nbsp;E.&nbsp;M.&nbsp;-L.' (103 chars)
      title => protected'Degradation of toxins and metabolites of cyanobacteria and micropollutants d
         uring biological sand filtration' (108 chars)
      journal => protected'Environmental Science and Technology' (36 chars)
      year => protected2026 (integer)
      volume => protected60 (integer)
      issue => protected'12' (2 chars)
      startpage => protected'9647' (4 chars)
      otherpage => protected'9659' (4 chars)
      categories => protected'cyanotoxin; drinking water treatment; enzymes; kinetic; biodegradation; biot
         ransformation products' (98 chars)
      description => protected'Cyanobacteria produce complex mixtures of secondary metabolites (cyano-metab
         olites), some of which are toxic and pose a growing concern for water utilit
         ies. While physical treatments such as filtration can efficiently remove cel
         ls, their lysis can release dissolved cyano-metabolites. This study investig
         ated the efficiency of laboratory-scale sand filtration to abate 19 cyano-me
         tabolites representing various structural classes. Furthermore, abatement of
          cyano-metabolites in a full-scale sand filtration is presented. Most cyano-
         metabolites showed abatement similar to or higher than the biodegradable ben
         chmark micropollutants atenolol, paracetamol, and valsartan. Among cyano-met
         abolites, anabaenopeptins and cyanopeptolins had the highest abatement, whil
         e cyclamides and microcystin-LR had the lowest abatement. Abiotic controls a
         nd formation trends of 10 identified biotransformation products demonstrated
          that biodegradation played a major role in their removal. Laboratory-scale 
         sand filters showed a sharp increase in biodegradation efficiency within day
         s due to their adaptation to cyano-metabolites. Increasing the contact time 
         and temperature both enhanced the abatement of most compounds, which could b
         e kinetically modeled. High cyano-metabolite concentrations suppressed their
          own relative abatement, possibly due to metabolic enzyme inhibition or satu
         ration. These findings suggest that sand filtration can serve as a dual-barr
         ier against cyano-metabolites, including particle removal and biodegradation
         . However, biodegradation will be affected by the temperature and cyano-meta
         bolite intake dynamics.' (1619 chars)
      serialnumber => protected'0013-936X' (9 chars)
      doi => protected'10.1021/acs.est.5c16532' (23 chars)
      uid => protected36410 (integer)
      _localizedUid => protected36410 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected36410 (integer)modified
      pid => protected124 (integer)
   2 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=36440, pid=124)
      originalId => protected36440 (integer)
      authors => protected'Wehrli,&nbsp;M.; Meyer,&nbsp;A.; Souza da Silva,&nbsp;É.; van Loon,&nbsp;S.
         ; van Hall,&nbsp;B.&nbsp;G.; van Gestel,&nbsp;C.&nbsp;A.&nbsp;M.; Natal-da-L
         uz,&nbsp;T.; Döring,&nbsp;M.&nbsp;V.&nbsp;R.; Feldhaar,&nbsp;H.; Mair,&nbsp
         ;M.; Jordan,&nbsp;D.; Langer,&nbsp;M.' (265 chars)
      title => protected'COLLEMBOT: AI-based counting of Collembola for OECD 232 tests' (61 chars)
      journal => protected'Environmental Toxicology and Chemistry' (38 chars)
      year => protected2026 (integer)
      volume => protected0 (integer)
      issue => protected'' (0 chars)
      startpage => protected'' (0 chars)
      otherpage => protected'' (0 chars)
      categories => protected'soil ecotoxicology; Folsomia candida; automated counting; computer vision; r
         isk assessment' (90 chars)
      description => protected'Ecotoxicological tests with soil organisms, such as the collembola <em>Folso
         mia candida</em>, are essential for assessing chemical risks in terrestrial 
         ecosystems. However, the current Organization for Economic Co-operation and 
         Development (OECD) 232 reproduction tests rely on manual counting of juvenil
         e and adult Collembola, a process that is costly, labor-intensive, time-cons
         uming and prone to operator bias. These limitations restrict data availabili
         ty and hinder robust risk assessments. We therefore developed COLLEMBOT, an 
         automated counting tool based on a YOLOv11 convolutional neural network, des
         igned to integrate seamlessly into OECD workflows without protocol modificat
         ions. The model was trained on high-resolution images (<em>n = 3207</em>
         ) from multiple laboratories and validated using 22 independent datasets (<e
         m>n = 1704 images</em>) from Amsterdam (Netherlands), Basel (Switzerland
         ), Bayreuth (Germany), Coimbra (Portugal) and Aarhus (Denmark). Datasets con
         sisted of relevant standard soils (OECD artificial soils with 2.5%, 5% and 1
         0% sphagnum peat; LUFA 2.2) and the springtail <em>Folsomia candida.</em> Au
         tomated counts showed strong agreement with manual counts (<em>R² =</em> 0.
         79–0.99). Dose-response curves derived from automated and manual counts st
         rongly overlapped and effect concentrations (EC10 and EC50) differed minimal
         ly (Median %Δ 6.2 ± 23 and EC10–EC90 <em>R<sup>2</sup> ≥</em> 0.977), 
         remaining within acceptable limits for regulatory risk assessment and confir
         ming reliability. Time efficiency improved significantly: a test with approx
         imately 300 images and up to 1,500 individuals per image was processed in le
         ss than 3 hr, compared to approximately 137 hr needed for manual countin
         g, a reduction of approximately 97%. By reducing labor and improving reprodu
         cibility, COLLEMBOT enables broader hazard data generation for collembola, s
         upporting science-based chemical risk assessment. The code and workflow are 
         publicly available to fa...' (2051 chars)
      serialnumber => protected'0730-7268' (9 chars)
      doi => protected'10.1093/etojnl/vgag068' (22 chars)
      uid => protected36440 (integer)
      _localizedUid => protected36440 (integer)modified
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      _versionedUid => protected36440 (integer)modified
      pid => protected124 (integer)
   3 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=35695, pid=124)
      originalId => protected35695 (integer)
      authors => protected'Bernet,&nbsp;N.&nbsp;M.; Soldini,&nbsp;C.; Felder,&nbsp;T.&nbsp;M.&nbsp;O.; 
         Lapčíková,&nbsp;K.; Neubauer,&nbsp;C.; Queen,&nbsp;W.&nbsp;L.; Kaegi,&nbs
         p;R.; Tamburini,&nbsp;F.; Hofstetter,&nbsp;T.&nbsp;B.' (205 chars)
      title => protected'Oxygen isotope analyses of phosphate and organophosphorus compounds by elect
         rospray ionization orbitrap mass spectrometry' (121 chars)
      journal => protected'Analytical Chemistry' (20 chars)
      year => protected2025 (integer)
      volume => protected97 (integer)
      issue => protected'41' (2 chars)
      startpage => protected'22777' (5 chars)
      otherpage => protected'22786' (5 chars)
      categories => protected'' (0 chars)
      description => protected'Orbitrap mass spectrometry with electrospray ionization (ESI-Orbitrap MS) en
         ables<sup>18</sup>O/<sup>16</sup>O ratio measurements in phosphate and organ
         ophosphorus compounds, which offers promising avenues for the study of metab
         olic, biogeochemical, and environmental processes. While the instrumental fe
         asibility of such<sup>18</sup>O/<sup>16</sup>O ratio measurements has been s
         hown, the applicability of such analyses in aqueous matrices on multipurpose
          mass spectrometers remains unaddressed. Here, we (i) evaluated the interpla
         y between instrument parameters and the long-term accuracy and precision of 
         ESI-Orbitrap MS for the determination of δ<sup>18</sup>O(PO<sub>4</sub>) fr
         om H<sub>2</sub>PO<sub>4</sub><sup>–</sup>vs PO<sub>3</sub><sup>–</sup>f
         ragments of phosphate, (ii) identified properties of methanolic sample solut
         ions that are critical for accurate and precise measurements, and (iii) prop
         ose a sample purification procedure for the elimination of matrix-based inte
         rferences. In 10 measurement campaigns over two years, we observed a long-te
         rm reproducibility of δ<sup>18</sup>O(PO<sub>4</sub>) within ±2.8‰. Resu
         lts of in-source fragmentation experiments of H<sub>2</sub>PO<sub>4</sub><su
         p>–</sup>to PO<sub>3</sub><sup>–</sup>show excellent agreement of δ<sup
         >18</sup>O and offer promising opportunities to probe for<sup>18</sup>O/<sup
         >16</sup>O ratios in organophosphorus compounds. By investigating the effect
          of the aqueous matrix and interfering anions on<sup>18</sup>O/<sup>16</sup>
         O ratio measurements, we found that a water content exceeding 50 vol % and t
         he presence of oxyanions such as nitrate and sulfate limit measurement accur
         acy due to interferences of matrix constituents in the ESI source. To overco
         me these challenges, we evaluated selective phosphate extraction with a zirc
         onium-based metal–organic framework (MOF) as sorbent. The resulting purifi
         cation procedure allowed for successful extraction and recovery of phosphate
          from nitrate- and sulfa...' (2161 chars)
      serialnumber => protected'0003-2700' (9 chars)
      doi => protected'10.1021/acs.analchem.5c04367' (28 chars)
      uid => protected35695 (integer)
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