1. A PROPOSAL FOR THE DEFINITION OF “PFOS and its Derivatives” IN THE DIRECTIVE 2013/39/EU
(presented by Italy)

2. Definition of «PFOS derivatives»
(Ammonium, potassium,…) salts?
Precursors (releasing polymers, molecules such as perfluorosulphonamides, PFOSA, perfluorosulphonyl fluoride, POSF)?
The EQS template, developed in the CIS-WG E group, refers to anion perfluorooctane sulfonate.
The sheet explains that “PFOS is the perfluorooctane sulphonate anion and is not a substance as such and therefore does not have a specific CAS number. It is commercially available in the form of salts, derivatives (PFOS-substances) and polymers (PFOS-polymers). The term PFOS related substances is used to refer to any or all of the substances which contain the PFOS moiety and may break down in the environment to give PFOS (EA, 2004)”.

3. ? WATER MONITORING WFD REPORTING PRECURSORS RELEASE POLYMERS PFOS ACID
POSF
DEGRADE
PFOS
ANION ?
PFOS
ANION
SALTS
DISSOLVE

4. Proposal
It is necessary to amend the definition in Directive 2013/39/EU in order to specify which substances should be monitored.
From an operational point of view, in water PFOS is present and analysed only as its anion perfluorooctane sulfonate (C8F17O3S-) and therefore is usually reported in the analytical reports.
The term “derivatives” could be avoided or at least substituted by “salts”
alternatively, a footnote should be added in the Table to explicit the list of “derivative” compounds.
In addition, it is necessary to establish which compound must be reported by MS: the anion perfluorooctane sulfonate (C8F17O3S-) or the corresponding acid (C8HF17O3S).
EQS has been calculated for the anion