CasNr: Tester. 72h LC h NOEC 1, d NOEC h LC Onchorhynchus mykiss 2

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1 Metribuzin Fane - Preparat Handelsnavn: Sencor Herbicid Casr: Tester Test-type Test-varighet µg/l Art Litteratur PEC PEC Alger kronisk Fisk kronisk Vannplanter akutt Vannplanter kronisk 7h LC h OEC,8 4 48h EC Daphnia magna d OEC h LC Onchorhynchus mykiss d OEC 5600 Onchorhynchus mykiss 4d EC50 60 Lemna gibba 4d OEC 40 Lemna gibba Basert på µg/l Usikkerhetsfaktor Verdi (µg/l) AMF basert på PEC Laveste L(EC) ,4 MF basert på PEC LavesteOEC,8 0 0,8 Vurderingsgrunnlag for usikkerhetsfaktor: PEC: Kronisk OEC tre trofiske nivå. Laveste OEC brukes med UF=0 PEC: L(E)C50 tilgjengelig fra tre trofiske nivå. Alger mest følsom; UF=0 Tidligere MFI alge, Fane - Tester Alle tester Test-type Test-varighet µg/l Art Litteratur Vis Alger kronisk Fisk kronisk Vannplanter akutt Vannplanter kronisk 7h LC h EC50 0 Scendesmus subspicatus, 3 7h OEC,8 4 48h LC h EC Daphnia magna d OEC 500 Daphnia magna d OEC d OEC 300 Daphnia magna 96h LC h LC Onchorhynchus mykiss d OEC 5600 Onchorhynchus mykiss 4d EC50 60 Lemna gibba 4d OEC 40 Lemna gibba Fane 3 - Kommentarer Fane 4 - r Litteraturreferanser

2 Metribuzin Dryselius, E.,994. Ecotoxicological evaluation of metribuzin. ational Chemicals Inspectorate, Sweden. Pesticide Ecotoxicity Database, 00. Environmental Fate and Effects Division of the Office og Pesticide programs, U.S.EPA, Washington, D.C. 3 Tomlin, Ed. 006: The Pesticide Manual 4 Biologische Bondesanstalt fur Land- und Forstwirtschaft, BBA,r.337, 006 Fane 5 - Diverse info om preparatet Godkjenelsesdato: Fornyet godkjenning: 006 Trukket (dato): SpesialAnalyse Metode: 3 M60 Bestemmelsesgrense: 0,0 Dato siste gjennomgang: GC-MULTI Kommentarer

3 Vedlegg for Metribuzin Kilde: Svensk undersøkelse 004. Metribuzin Metribuzin is a systemic herbicide, used in cultivation of potatoes and carrots. (CH 3 ) 3 C O SCH 3 H. Physico-chemical properties Physico-chemical properties of metribuzin are summarised in table.. Table.: Physico-chemical properties of metribuzin. Reference CAS-o Empirical formula C 8 H 4 4 OS 3 Molecular weight [g/mol] Solubility in water [mg/kg] 050 at 0 C 3 Vapour pressure [Pa] Log P ow.6 at ph 5.6, 0 C 3 Henry s law constant [Pa m 3 /mol] 0-5 at 0 C 3. Toxicity to aquatic organisms The toxicity of metribuzin to aquatic organisms is summarised in table.. Table.: Aquatic ecotoxicity data of metribuzin. Species End-point Exposure duration Result [mg as/l] Reference Algae Scenedesmus subspicatus biomass 96 h, static E b C E r C ) growth rate Higher aquatic plants Lemna gibba 4 d, static EC OEC 0.04 Crustaceans Daphnia magna 48 h, static EC Daphnia magna 48 h, static EC 50 4 Daphnia magna 48 h, static EC Penaeus duorarum 96 h, static LC Penaeus duorarum 96 h, semi-static LC Daphnia magna d, flow-through OEC.3 Daphnia magna d, static-renewal OEC 3.3

4 Daphnia magna immobilisation reproduction d, semi-static OEC.5 OEC.5 Molluscs Crassostrea virginica shell deposition 96 h, static EC EC 50 5 Crassostrea virginica shell deposition 96 h, static-renewal EC 50 4 Fish Oncorhynchus mykiss mortality 96 h, static LC 50 4 Lepomis macrochirus mortality 96 h, static LC 50 9 Ictalurus punctatus mortality 96 h, static LC 50 >00 Lepomis macrochirus mortality 96 h, static LC Oncorhynchus mykiss mortality 96 h, static LC Cyprinodon variegatus mortality 96 h, static LC 50 85, Leuciscus idus melanotus mortality 96 h, static LC 50 4 Lepomis macrochirus mortality 96 h, static LC Oncorhynchus mykiss mortality 96 h, static LC Oncorhynchus mykiss mortality 96 h, static LC Oncorhynchus mykiss d, semi-static OEC 5.6 ) Effect concentration basis for calculation of PEC. Test substance purity 99% The most sensitive (acute effects) of the tested species was Scenedesmus subspicatus, with an E r C 50 of 0.0 mg/l and. Since the acute/chronic ratio is low, a PEC based on the long term data does not guarantee appropriate protection against acute effects, hence the PEC is based on acute toxicity data. The lowest EC 50 of 0.0 mg/l is divided by a factor of 00, which results in a PEC of mg/l..3 Bioaccumulation and persistence Metribuzin is not expected to bioaccumulate. The compound is hydrolytically stable, and slowly degraded in soil ()..4 Proposed water quality objective Since PEC is mg/l, the proposed water quality standard for metribuzin is 0-4 mg/l..5 Comments Due to potential for leach through the soil profile Metribuzin may reach surface- and ground waters. Metribuzin have three metabolites of interest, desaminometribuzin (DA), diketometribuzin (DK) and desaminodiketometribuzin (DADK) ()..6 Literature () Dryselius, E., (994). Ecotoxicological evaluation of metribuzin. ational Chemicals Inspectorate, Sweden.

5 () Pesticide Ecotoxicity Database, 00. Environmental Fate and Effects Division of the Office of Pesticide programs, U.S.EPA, Washington, D.C. (3) Tomlin, C., 000. The Pesticide Manual, th edition. British Crop Protection Council.