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Pesticide risk assessment of the active substance sodium silver thiosulfate

The conclusions were reached on the basis of the evaluation of the representative uses of this sodium silver thiosulfate complex as a plant growth regulator on cut flowers

Sodium silver thiosulfate (in solution with a ratio of at least 1 to 8 silver to thiosulfate ions) is a new active substance for which in accordance with Article 6(2) of Council Directive 91/414/EEC the Netherlands (hereinafter referred to as the ‘RMS’) received an application from Chrysal International (previously Enhold B.V., Netherlands), for approval of a substance that they named silver thiosulfate. Complying with Article 6(3) of Directive 91/414/EE the completeness of the dossier was checked by the RMS. The European Commission recognised in principle the completeness of the dossier by Commission Decision 2003/850/EC.

The RMS provided its initial evaluation of the dossier on sodium silver thiosulfate in the Draft Assessment Report (DAR), which was received by the EFSA on 4 July 2005. The peer review was initiated on 11 July 2005 by dispatching the DAR for consultation of the Member States and the applicant Chysal International (previously Enhold B.V., Netherlands). In accordance with Commission Regulation (EU) No 188/2011 Article 11(6) additional information was requested. The RMS’s evaluation of the additional information was submitted to the EFSA in the format of Addenda to the DAR. The Addenda were dispatched for consultation of the Member States and the applicant Chrysal International (previously Enhold B.V., Netherlands) on 5 October 2011.

Following consideration of the comments received on the DAR, it was concluded that EFSA should conduct an expert consultation. in the areas of all sections and should adopt a conclusion on whether the substance the applicant named silver thiosulfate can be expected to meet the conditions provided for in Article 5 of Directive 91/414/EEC, in accordance with Article 8 of Commission Regulation (EU) No 188/2011.

The conclusions laid down in this report were reached on the basis of the evaluation of the representative uses of sodium silver thiosulfate (in solution with a ratio of at least 1 to 8 silver to thiosulfate ions) as a plant growth regulator on cut flowers as proposed by the applicant. Full details of the representative uses can be found in Appendix A to this report.

In the area of identity, physical/chemical/technical properties and methods of analysis data gaps were identified for a method of analysis for the complex as well as storage stability data.

No areas of concern were identified in the area of mammalian toxicology and the risk assessment could be finalised.

Based on the representative use on cut flowers, no residues are expected to occur in food of plant or animal origin and therefore a quantitative consumer risk assessment is not required.

The information on environmental fate and behaviour was sufficient to carry out the necessary environmental exposure assessments at the EU level for the representative use assessed.

A low risk was concluded for birds, mammals, aquatic organisms, bees, foliar dwelling non-target arthropods, non-target plants and sewage treatment organisms. A data gap was identified for information to address the ecotoxicological risk assessment in situations and processes where sewage sludge may be spread on to agricultural land.

by S. C.
07 october 2013, World News > Europe

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