CasNr: Tester. 96h NOEC 100 Selenastrum capricornutum 4. 21d NOEC h LC AMF basert på PNEC1 Laveste L(EC)

Transkript

1 Metamitron Fane 1 - Preparat Handelsnavn: Goltix Herbicid CasNr: Tester Test-type Test-varighet µg/l Art Litteratur PNEC1 PNEC2 Dafnia akutt Fisk akutt Fisk kronisk 96h EC Selenastrum 4 96h NOEC 100 Selenastrum 4 48h EC Daphnia magna 21d NOEC h LC d NOEC 200 Onchorhynchus mykiss Basert på µg/l Usikkerhetsfaktor Verdi (µg/l) AMF basert på PNEC1 Laveste L(EC) MF basert på PNEC2 LavesteNOEC Vurderingsgrunnlag for usikkerhetsfaktor: PNEC2: Kronisk NOEC tre trofiske nivå. Laveste NOEC brukes med UF=10 PNEC1: L(E)C50 tilgjengelig fra tre trofiske nivå. Alger mest følsom; UF=10 Tidligere MFI Var basert på alge 11 Fane 2 - Tester Alle tester Test-type Test-varighet µg/l Art Litteratur Vis Dafnia akutt Fisk akutt Fisk kronisk EC Scendesmus subspicatus 2 72h EC Selenastrum 1 96h EC Selenastrum 4 72d NOEC h NOEC 120 Selenastrum 1 96h NOEC 100 Selenastrum 4 48h EC Daphnia magna 21d NOEC d NOEC Daphnia magna 1 96h LC d NOEC 200 Onchorhynchus mykiss Fane - Kommentarer Fane 4 - r Litteraturreferanser 1 Miljøstyrelsen,2000. Miljømessig grundvurdering. Metamitron, Bilaga 1.a. Pesticidkontoret, Denmark.

2 Metamitron 2 Tomlin Ed. 2006: The Pesticide Manual Hance K., 199. Ecotoxicological evaluation of the herbicide Metamitron. National Chemical inspectorate. 4 Vaittinen S-L., Metamitron: upptrædande och verkan i naturen, KUIPIO, Finland. 5 Biologische Bundesanstalt fur Land - und Forstwirtschaft, BBA-Nr 456, 2006 Fane 5 - Diverse info om preparatet Godkjenelsesdato: Fornyet godkjenning: 2006 Trukket (dato): SpesialAnalyse Metode: M60 Bestemmelsesgrense: 0,1 Dato siste gjennomgang: GC-MULTI Kommentarer

3 Vedlegg for Metamitron Kilde: Svensk undersøkelse Metamitron Metamitron is a systemic herbicide of the triazinone group. The mode of action is by inhibition of photosynthesis and thereby plant growth is inhibited. Intended use against grass and broad-leaved weeds in beets and strawberries (). 1.1 Physico-chemical properties Physico-chemical properties of metamitron are summarised in table 1.1. Table 1.1: Physico-chemical properties of metamitron. Reference CAS-No Empirical formula C 10 H 10 N 4 O 1 Molecular weight [g/mol] Solubility in water [mg/kg] 1700 at 20 C 1 pka Not relevant Vapour pressure [Pa] at 20 C 1 Log P ow Henry s law constant [Pa m /mol] Toxicity to aquatic organisms The toxicity of metamitron to aquatic organisms is summarised in table 1.2. Table 1.2: Aquatic ecotoxicity data of metamitron. Species End-point Exposure duration Result [mg as/l] Reference Algae Selenastrum growth rate 72h, static E r C NOE r C 0.12 Selenastrum growth rate 96h, static E r C ) Selenastrum Crustaceans NOE r C 0.1 growth rate 72h, static E r C ) NOE r C 0.6 1) 1 4

4 Daphnia magna immobility 48h, static EC Daphnia magna immobility 48h EC ) Daphnia magna reproduction 21d NOEC 2 1 Daphnia magna reproduction 21d, semi-static NOEC 10 1 Fish Onchorhynchus sublethal effects 21d, semi-static NOEC 9.9 mykiss Onchorhynchus mykiss sublethal effects 21d, semi-static NOEC.2 1) 1) Test performed on preparation. Value expressed as active substance. 2) Effect concentration basis for calculation of PNEC. The most sensitive (acute effects) of the tested species was Selenastrum, with an EC 50 of 0.14 mg/l and NOEC of 0.1 mg/l. Since the acute/chronic ratio is low and does not guarantee appropriate protection against acute effects, the PNEC is based on acute toxicity data. Hence, the lowest EC 50 of 0.14 mg/l is divided by a factor of 100, which results in a PNEC of mg/l. 1. Bioaccumulation and persistence Metamitron is not expected to bioaccumulate. Log P ow is low hence no bioaccumulation studies have been performed. Metamitron is slowly partitioned into the sediment, and is evenly distributed between aqueous and the sediment phase after 50 days (). The substance is degraded with a DT 50 of 7-9 days. One major metabolite is formed, desamino-metamitron. The metabolite is not persistent, and shows lower toxicity towards aquatic organisms than the parent compound (1). Therefore, no separate water quality standard is proposed for that compound. 1.4 Proposed water quality objective Since PNEC is mg/l, the proposed water quality standard for metamitron is mg/l. 1.5 Comments The metabolite is mobile in soil and may reach ground and surface water due to leach through the soil profile (1). 1.6 Literature (1) MiljØstyrelsen, MiljØmaessig grundvurdering. Metamitron, Bilaga 1.a. Pesticidkontoret, Denmark. (2) Tomlin, C., The Pesticide Manual, 12 th edition. British Crop Protection Council.

5 () Hanze K., 199. Ecotoxicological evaluation of the herbicide Metamitron. National Chemicals inspectorate. (4) Vaittinen S-L., Metamitron: Uppträdande och verkan i naturen. KUIPIO, Finland.