Member States shall take all necessary measures to ensure that the substances and materials listed as extraction solvents in Annex I comply with the following general and specific purity criteria:
((a))
they shall not contain a toxicologically dangerous amount of any element or substance;
((b))
subject to any exceptions deriving from the specific purity criteria adopted in accordance with point (d) of Article 4, they shall not contain more than 1 mg/kg of arsenic or more than 1 mg/kg of lead;
((c))
they shall satisfy the specific purity criteria adopted in accordance with point (d) of Article 4.