120hEC50 20, h NOEC h LC Onchorhynchus mykiss 1. 21d NOEC Onchorhynchus mykiss 1

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1 Tribenuron-metyl Fane - Preparat Handelsnavn: Express Herbicid Tester Casr: Test-type Test-varighet µg/l Art Litteratur PEC PEC Alger kronisk Dafnia akutt Fisk akutt Fisk kronisk Vannplanter akutt Vannplanter kronisk 0hEC50 0,8 3 7h OEC h EC Daphnia magna d OEC 0000 Daphnia magna 96h LC Onchorhynchus mykiss d OEC Onchorhynchus mykiss 4d EC50 4,3 Lemna gibba 4d OEC Lemna gibba Basert på µg/l Usikkerhetsfaktor Verdi (µg/l) AMF basert på PEC Laveste L(EC)50 4,3 0 0,43 MF basert på PEC LavesteOEC 0 0, Vurderingsgrunnlag for usikkerhetsfaktor: PEC: OEC tre trofiske nivå. For alger er imidletid laveste OEC i databasen høyere enn laveste EC50. Imidlertid er vannplanter mer følsomme enn alger og blir utslagsgivende. Derfor brukes OEC-verdien folemna gibba med UF=0. PEC: (E)C50 tilgjengelig fra tre trofiske nivå. Vannplanter mest følsomme organisme. Derfor brukes EC50-verdien for L. gibba med UF=0 Tidligere MFI vannplante Fane - Tester Alle tester Test-type Test-varighet µg/l Art Litteratur Vis Alger kronisk Dafnia akutt Fisk akutt Fisk kronisk Vannplanter akutt Vannplanter kronisk 0h LC hEC50 0,8 3 4hEC50 80 Chlorella fusca vaculata 7h OEC h EC Daphnia magna 48h LC d OEC 0000 Daphnia magna 96h LC Onchorhynchus mykiss d OEC Onchorhynchus mykiss 4d EC50 4,3 Lemna gibba 4d OEC Lemna gibba Fane 3 - Kommentarer Fane 4 - r Litteraturreferanser

2 Tribenuron-metyl European Commission Peer Review Programme. Tribenuron methyl Monograph, 003. Rapporteur Member Srata: 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.: The Pesticide Manual, Biologische Bundesanstalt fur Land- und Forstwirtschaft. BBA- r Fane 5 - Diverse info om preparatet Godkjenelsesdato: Fornyet godkjenning: 000 Trukket (dato): SpesialAnalyse Metode: #Feil Bestemmelsesgrense: 0,0 Dato siste gjennomgang: #Feil Kommentarer

3 Vedlegg for Tribenuron-metyl Kilde: Svensk undersøkelse 004. Tribenuron methyl Tribenuron methyl is a sulfonylurea herbicide, intended for use in cereals and pasture. The mode of action is inhibition of the plant enzyme acetolactate synthase. The inhibition leads to rapid cessation of shoot and root cell division and growth. Tribenuron methyl has been evaluated within the framework of EU Dir. 9/44. SO HCO CO CH 3 CH 3 OCH 3 CH 3. Physico-chemical properties Physico-chemical properties of tribenuron methyl are summarised in table.. Table.: Physico-chemical properties of tribenuron methyl. Reference CAS-o Empirical formula C 5 H 7 5 O 6 S Molecular weight [g/mol] Solubility in water [mg/kg] 48.9 at 0 ph at 0 ph at 0 ph 9 pka 4.7 Vapour pressure [Pa] Log P ow.6 at ph at ph at ph 9 Henry s law constant [Pa m 3 /mol] Toxicity to aquatic organisms The toxicity of tribenuron methyl to aquatic organisms is summarised in table.. Table.: Aquatic ecotoxicity data of tribenuron methyl. Species End-point Exposure duration Result [mg as/l] Reference Algae Chlorella fusca growth 4h EC vaculata Aquatic plants Lemna gibba frond number 4d EC )

4 OEC 0.00 nominal Crustaceans Daphnia magna immobility 48h EC 50 >894 Daphnia magna immobility 96h EC Daphnia magna growth d OEC 0 Fish Oncorhynchus mortality 96h LC mykiss Lepomis mortality 96h EC 50 >000 macrochirus Oncorhynchus mykiss growth d OEC 560 ) Effect concentration basis for calculation of PEC. Test substance purity 9.6% The most sensitive (acute effects) of the tested species was Lemna gibba, with an EC 50 of mg/l and a OEC of 0.00 mg/l. Since the acute/chronic ratio is low and does not guarantee appropriate protection against acute effects, the PEC is based on acute toxicity data. Hence, the lowest EC 50 of mg/l is divided by a factor of 00, which results in a PEC of mg/l..3 Bioaccumulation and persistence Tribenuron methyl has a low P ow, , depending on ph, and is therefore not expected to bioaccumulate. In water tribenuron methyl degrades through hydrolytic cleavage, more rapidly at acidic conditions. In water/sediment systems the degradation occurs with a DT 50 of 3-3 in the water phase, and 7-3 days for the whole system. The major degradation products (exceeding 0%) in water are triazine amine, acid sulfonamide and saccarin. The metabolites are found mainly in water phase except triazine amine which partitions into sediment. Studies indicate that metabolites formed in water/sediment system are not more toxic to aquatic organisms than the parent compound..4 Proposed water quality objective Since PEC is mg/l, the proposed water quality standard for tribenuron methyl is mg/l..5 Comments Tribenuron methyl is rapidly transformed in aerobic soil (DT 50 days) to the metabolites triazine amine, acid sulfonamide and saccarin. Triazine amine degrades fairly rapid (DT days), while acid sulfonamide and saccarin degrade more slowly, DT days and 3 days. Tribenuron methyl may leach through the soil profile. Leach potential is increased in alkaline soils. Tribenuron methyl is not volatile.

5 .6 Literature () European Commission Peer Review Programme. Tribenuron methyl Monograph, 003. Rapporteur Member State: Sweden. () Pesticide Ecotoxicity Database, 00. Environmental Fate and Effects Division of the Office of Pesticide programs, U.S.EPA, Washington, D.C.