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Are substances more persistent than test systems lead to believe? Non-extractable residues: experimental examination of suitable extraction methods in view of a long-term risk for the environment

In transformation tests with organic substances in soil non-extractable residues (NER) are formed which remain there as residues. Some can be released again into the environment in the long-term and should be considered in the persistent assessment. Besides substances properties and soil characteristics the proportion of NER strongly depends on the extraction procedure. Within the European authorisation procedures, there is no precise and generally applicable definition of how NERs are to be determined and characterised. In this project a widely applicable standardised extraction procedure for the determination of non-extractable residues was developed to improve the comparability of NER data. Further extraction methods for the characterisation of reversibly bound residues such as ⁠ EDTA ⁠ extraction and silylation are discussed. The report is aimed at regulators, industry and experts from science and research. Veröffentlicht in Texte | 133/2022.

Seismic test data and resolution analysis from the first borehole broadband seismometers at Mt. Etna, Sicily (Italy), as part of the SiC nano for PicoGeo project

Abstract

Are substances more persistent than test systems lead to believe? Non-extractable residues: experimental examination of suitable extraction methods in view of a long-term risk for the environment

In transformation tests with organic substances in soil non-extractable residues (NER) are formed which remain there as residues. Some can be released again into the environment in the long-term and should be considered in the persistent assessment. Besides substances properties and soil characteristics the proportion of NER strongly depends on the extraction procedure. Within the European authorisation procedures, there is no precise and generally applicable definition of how NERs are to be determined and characterised.In this project a widely applicable standardised extraction procedure for the determination of non-extractable residues was developed to improve the comparability of NER data. Further extraction methods for the characterisation of reversibly bound residues such as ⁠EDTA⁠ extraction and silylation are discussed.The report is aimed at regulators, industry and experts from science and research.

GTS Bulletin: SADL35 EDZO - Surface data (details are described in the abstract)

The SADL35 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SA): Aviation routine reports A1A2 (DL): Germany (The bulletin collects reports from stations: EDHA;EDHI;HAMBURG-FINKENWERDER ;EDHK;KIEL-HOLTENAU ;EDJA;MEMMINGEN ALLGAU ;EDMO;OBERPFAFFENHOFEN ;EDOP;SCHWERIN PARCHIM ;EDTD;DONAUESCHINGEN-VILLINGEN ;EDTL;LAHR ;EDTY;SCHWAEBISCH HALL ;EDVE;BRAUNSCHWEIG WOLFSBURG ;EDXW;WESTERLAND SYLT ;EDZO;)

GTS Bulletin: SADL40 EDZW - Surface data (details are described in the abstract)

The SADL40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SA): Aviation routine reports A1A2 (DL): Germany (The bulletin collects reports from stations: EDOP;SCHWERIN PARCHIM ;EDVK;KASSEL-CALDEN ;EDMO;OBERPFAFFENHOFEN ;EDXW;WESTERLAND SYLT ;EDTL;LAHR ;EDDV;HANNOVER ;EDDW;BREMEN ;EDFH;FRANKFURT-HAHN ;EDDR;SAARBRUECKEN ;EDDS;STUTTGART ;EDDT;BERLIN-TEGEL INT ;EDDM;MUNICH INT ;EDTD;DONAUESCHINGEN-VILLINGEN ;EDDN;NUERNBERG;EDHI;HAMBURG-FINKENWERDER ;EDHL;LUEBECK BLANKENSEE ;EDDP;LEIPZIG HALLE ;EDFM;MANNHEIM-CITY ;EDHK;KIEL-HOLTENAU ;EDBC;COCHSTEDT ;EDVE;BRAUNSCHWEIG WOLFSBURG ;EDDK;COLOGNE BONN ;EDJA;MEMMINGEN ALLGAU ;EDDL;DUESSELDORF INT ;EDDE;ERFURT ;EDDF;FRANKFURT AM MAIN INT ;EDDG;MUENSTER OSNABRUECK ;EDDH;HAMBURG ;EDLW;DORTMUND ;EDDC;DRESDEN ;EDDB;BERLIN-Brandenburg INT ;EDLV;NIEDERRHEIN ;EDLP;PADERBORN LIPPSTADT ;EDLN;MOENCHENGLADBACH ;EDNY;FRIEDRICHSHAFEN ;EDSB;KARLSRUHE BADEN-BADEN ;EDMA;AUGSBURG ;EDQM;HOF-PLAUEN ;EDRZ;ZWEIBRUECKEN ;EDAC;ALTENBURG-NOBITZ ;EDTY;SCHWAEBISCH HALL ;EDAH;HERINGSDORF ;EDGS;SIEGERLAND ;) (Remarks from Volume-C: COMPILATION FOR REGIONAL EXCHANGE)

GTS Bulletin: LCDL34 EDZO - Aviation Information in XML (details are described in the abstract)

The LCDL34 TTAAii Data Designators decode as: T1 (L): Aviation Information in XML A1A2 (DL): Germany T1T2 (LC): Aerodrome Forecast ("TAF") (VT<12 hours)"(The bulletin collects reports from stations: EDAC;ALTENBURG-NOBITZ;EDBC;COCHSTEDT;EDGS;SIEGERLAND;EDHL;LUEBECK BLANKENSEE;EDLN;MOENCHENGLADBACH;EDMA;AUGSBURG;EDQM;HOF-PLAUEN;EDNY;FRIEDRICHSHAFEN;EDZO;)

GTS Bulletin: LCDL35 EDZO - Aviation Information in XML (details are described in the abstract)

The LCDL35 TTAAii Data Designators decode as: T1 (L): Aviation Information in XML A1A2 (DL): Germany T1T2 (LC): Aerodrome Forecast ("TAF") (VT<12 hours)"(The bulletin collects reports from stations: EDHA;EDHI;HAMBURG-FINKENWERDER;EDHK;KIEL-HOLTENAU;EDJA;MEMMINGEN ALLGAU;EDMO;OBERPFAFFENHOFEN;EDTD;DONAUESCHINGEN-VILLINGEN;EDTL;LAHR;EDTY;EDVE;BRAUNSCHWEIG WOLFSBURG;EDXW;WESTERLAND SYLT;EDZO;)

Stabilization of chromium (VI) in the presence of iron (II): method development and validation

The presence of Cr (VI) in drinking water is mainly caused by leaching of chromium-containing aquifer material into groundwater. In contrast to Cr (III), it has been classified as highly toxic. For this reason, the WHO recommends the implementation of separate guideline values, instead of the so far used limit value of total chromium. The separate evaluation of Cr (VI) in raw water and during removal processes requires the Cr (VI) concentration to remain stable after sampling. In the presence of Fe (II), a stabilization of the samples is necessary to inhibit further reduction of Cr (VI) by Fe (II). In this study, two methods of Cr (VI) stabilization in Fe-(II)-containing water samples are investigated: Fe (II) oxidation by oxygen at high pH values in the presence of buffers and Fe (II) complexation by chelating agents. When adding hydrogen carbonate buffer, Cr (VI) recovery reached 100% at pH values of 10 to 12 in the presence of up to 3 mg L-1 Fe (II). Using hydrogen phosphate buffer, Cr (VI) recovery reached 100% only at pH 12 but for a Fe (II) concentration up to 6 mg L-1. Ammonium buffer was found to be less suitable for Cr (VI) stabilization. The addition of EDTA and citrate resulted in low recovery of Cr (VI), whereas citrate was found to accelerate the Cr (VI) reduction. Quelle: https://www.mdpi.com

Workshop zu den Risiken der Rückholung - Impulsvortrag AG 1: Radionuklidfreisetzung bei einem auslegungsüberschreitenden Lösungszutritt (AüL) (PDF, nicht barrierefrei)

Radionuklidfreisetzung bei einem auslegungsüberschreitenden Lösungszutritt (AüL) Horst Geckeis, KIT KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft www.kit.edu Szenario (schematisch, hypothetisch) Mgl. Radionuklidreaktionen im Grubengebäude 2 09.05.2023 Abschätzung der Radionuklidfreisetzung Radionuklidverhalten im Grubengebäude Leicht löslich z.B. Th, Pu, Am Komplexe mit EDTA, Citrat, Karbonat z.B. Cs, 3H Wenig sorbiert z.B. Cs, 3H U, Am, Sr U, Pu, Th, Am, Sr, 14CO 2- 3 Schwerlöslich: z.B. Th, Pu U, Pu, Th, Am, Sr, 14CO32- Schwer löslich Stark sorbiert Halbwertszeiten: kurz: 137Cs: 30 a; 3H: 12 a; lang: 239Pu: 24.100 a; 14C: 5730 a; 241Am: 432 a 3 09.05.2023 Zementmaterialien

Emissionsminderung schwer abbaubarer Komplexbildner

Projekt "Verminderung der Emission schwer abbaubarer Komplexbildner in Sachsen": Durch die Erarbeitung des qualitativen Stofflusses schwer abbaubarer Komplexbildner wie EDTA in Sachsen kann zukünftig auf eine Informationsbasis für künftige Entscheidungen - wie z.B. einer Einschätzung zur Betroffenheit eventueller Stoffbeschränkungen - zurückgegriffen werden.

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