Commission working document does not necessarily represent the views of the commission services




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EUROPEAN COMMISSION

HEALTH & CONSUMER PROTECTION DIRECTORATE-GENERAL


Directorate D - Food Safety: Production and distribution chain

Unit D.3 - Chemicals, contaminants and pesticides


MCPA

SANCO/4062/2001-rev. 5

07 April 2005


EU RESTRICTED


COMMISSION WORKING DOCUMENT - DOES NOT NECESSARILY REPRESENT THE VIEWS OF THE COMMISSION SERVICES


DRAFT


Review report for the active substance MCPA

Finalised in the Standing Committee on the Food Chain and Animal Health at its meeting on 15 April 2005

in view of the inclusion of MCPA in Annex I of Directive 91/414/EEC


1. Procedure followed for the re-evaluation process


This review report has been established as a result of the re-evaluation of MCPA, made in the context of the work programme for review of existing active substances provided for in Article 8(2) of Directive 91/414/EEC concerning the placing of plant protection products on the market, with a view to the possible inclusion of this substance in Annex I to the Directive.


Commission Regulation (EEC) No 3600/92(1) laying down the detailed rules for the implementation of the first stage of the programme of work referred to in Article 8(2) of Council Directive 91/414/EEC, as last amended by Regulation (EC) No 2266/2000(2), has laid down the detailed rules on the procedure according to which the re-evaluation has to be carried out. MCPA is one of the 90 existing active substances covered by this Regulation.


In accordance with the provisions of Article 4 of Regulation (EEC) No 3600/92, Law Offices of Samuel Pisar (now Nufarm UK Limited) on 25 June 1993, Rhône-Poulenc Agro on 15 July 1993, BASF AG on 13 July 1993, Agrolinz on 26 July 1003, ACI International (on behalf of Sanachem International) on 30 July 1993, CFPI on 28 July 1993, Akzo Chemicals on 20 July 1993, AH Marks & Co Ltd on 20 July 1993, B.V. Luxan on 21 July 1993 and Esbjerg Kemi A/S on 21 July 1993 notified to the Commission of their wish to secure the inclusion of the active substance MCPA in Annex I to the Directive.

In accordance with the provision of art. 4 of Regulation (EEC) No 3600/92, Sipcam-Ooxon (now Oxon Italia S.p.A) on 20 July 1993 notified to the Commission of their wish to secure the inclusion of the active substance MCPA–thioethyl ester in Annex I to the Directive, as confirmed on 10 October 1994 to RMS.


In accordance with the provisions of Article 4 of Regulation (EEC) No 3600/92, Industry Task Force on MCPA Research Data, comprising BASF AG, Nufarm UK Limited (leading the task force) and it affiliates Agrolinz and Akzo Chemicals, and AH Marks, notified to the Commission on 25 October 1994 of their wish to secure the inclusion of the active substance MCPA in Annex I to the Directive.

On 25 June 1994, Rhône-Poulenc Agro informed the Commission about the transfer of their business on MCPA to Nufarm UK Limited. CFPI informed, on 1st November 1994, the withdrawal of their notification. The same information was given by B.V. Luxan on 06 December 1994.


In accordance with the provisions of Article 5 of Regulation (EEC) No 3600/92, the Commission, by its Regulation (EEC) No 933/94(3), as last amended by Regulation (EC) No 2230/95(4), designated Italy as rapporteur Member State to carry out the assessment of MCPA on the basis of the dossier/s submitted by the notifier/s. In the same Regulation, the Commission specified furthermore the deadline for the notifiers with regard to the submission to the rapporteur Member States of the dossiers required under Article 6(2) of Regulation (EEC) No 3600/92, as well as for other parties with regard to further technical and scientific information; for MCPA this deadline was 31 October 1995.


The Industry Task Force on MCPA Research Data (comprising BASF, Nufarm and its affiliates Agrolinz and Akzo Chemicals, and AH Marks), as well as Oxon Italia SpA (which submitted information on MCPA thioethyl ester and got access to MCPA data by Agrolinz on 10 Jaunary 1995) and Sanachem (which, in December 1997, has been purchased by Dow Agrosciences, a member of the Industry Task Force on MCPA Research Data) each submitted dossiers to the rapporteur Member State which did not contain substantial data gaps, taking into account the supported uses. Therefore, Nufarm, being the designated representative of the MCPA task force, and Oxon Italia SpA (MCPA thioethyl ester) were considered to be the main data submitters.


In accordance with the provisions of Article 7(1) of Regulation (EEC) No 3600/92, Italy submitted on 5 April 2001 to the Commission the report of its examination, hereafter referred to as the draft assessment report, including, as required, a recommendation concerning the possible inclusion of MCPA in Annex I to the Directive. Moreover, in accordance with the same provisions, the Commission and the Member States received also the summary dossier on MCPA from Industry Task Force on MCPA Research Data and MCPA thioethyl ester from Oxon Italia SpA, on 20 December 2001.


In accordance with the provisions of Article 7(3) of Regulation (EEC) No 3600/92, the Commission forwarded for consultation the draft assessment report to all the Member States as well as to Nufarm, designated representative(s) of the MCPA task force, and Oxon Italia SpA being the main data submitters, on 23 May 2001.


The Commission organised an intensive consultation of technical experts from a certain number of Member States, to review the draft assessment report and the comments received thereon (peer review), in particular on each of the following disciplines:


- identity and physical /chemical properties ;

- fate and behaviour in the environment ;

- ecotoxicology ;

- mammalian toxicology ;

- residues and analytical methods ;

- regulatory questions.


The meetings for this consultation were organised on behalf of the Commission by the Pesticide Safety Directorate (PSD) in York, United Kingdom, from February to September 2002.


The report of the peer review (i.e. full report) was circulated, for further consultation, to Member States and the main data submitters, Industry Task Force on MCPA Research Data (MCPA) and Oxon Italia S.p.A. (MCPA thioethyl ester), on 11 October 2002 for comments and further clarification.


In accordance with the provisions of Article 7(3) of Regulation (EEC) No 3600/92, the dossier, the draft assessment report, the peer review report (i.e. full report) and the comments and clarifications on the remaining issues, received after the peer review were referred to the Standing Committee on the Food Chain and Animal Health, and specialised working groups of this Committee, for final examination, with participation of experts from all Member States. This final examination took place from February 2002 to December 2004, and was finalised in the meeting of the Standing Committee on 15 April 2005.


The review did not reveal any open questions or concerns which would have required a consultation of the Scientific Committee on Plants.


The present review report contains the conclusions of the final examination; given the importance of the draft assessment report, the peer review report (i.e. full report) and the comments and clarifications submitted after the peer review as basic information for the final examination process, these documents are considered respectively as background documents A, B and C to this review report and are part of it.


2. Purposes of this review report


This review report, including the background documents and appendices thereto, has been developed and finalised in support of the Directive 2005/57/EC concerning the inclusion of MCPA in Annex I to Directive 91/414/EEC, and to assist the Member States in decisions on individual plant protection products containing MCPA they have to take in accordance with the provisions of that Directive, and in particular the provisions of article 4(1) and the uniform principles laid down in Annex VI.


This review report provides also for the evaluation required under Section A.2.(b) of the above mentioned uniform principles, as well as under several specific sections of part B of these principles. In these sections it is provided that Member States, in evaluating applications and granting authorisations, shall take into account the information concerning the active substance in Annex II of the directive, submitted for the purpose of inclusion of the active substance in Annex I, as well as the result of the evaluation of those data.


In accordance with the provisions of Article 7(6) of Regulation (EEC) No 3600/92, Member States will keep available or make available this review report for consultation by any interested parties or will make it available to them on their specific request. Moreover the Commission will send a copy of this review report (not including the background documents) to all operators having notified for this active substance under Article 4(1) of this Regulation.


The information in this review report is, at least partly, based on information which is confidential and/or protected under the provisions of Directive 91/414/EEC. It is therefore recommended that this review report would not be accepted to support any registration outside the context of Directive 91/414/EEC, e.g. in third countries, for which the applicant has not demonstrated to have regulatory access to the information on which this review report is based.


3. Overall conclusion in the context of Directive 91/414/EEC


The overall conclusion from the evaluation is that it may be expected that plant protection products containing MCPA will fulfil the safety requirements laid down in Article 5(1)(a) and (b) of Directive 91/414/EEC. This conclusion is however subject to compliance with the particular requirements in sections 4, 5, 6 and 7 of this report, as well as to the implementation of the provisions of Article 4(1) and the uniform principles laid down in Annex VI of Directive 91/414/EEC, for each MCPA containing plant protection product for which Member States will grant or review the authorisation.


These conclusions were reached, in particular, for the acid of MCPA for which detailed information has been submitted. Further studies, in particular bridging studies, may be necessary in relation to the acceptance of salts or esters of MCPA (including MCPA-thioethyl) other than the acid evaluated.


Furthermore, these conclusions were reached within the framework of the uses which were proposed and supported by the main data submitter and mentioned in the list of uses supported by available data (attached as Appendix IV to this Review Report).


Extension of the use pattern beyond those described above will require an evaluation at Member State level in order to establish whether the proposed extensions of use can satisfy the requirements of Article 4(1) and of the uniform principles laid down in Annex VI of Directive 91/414/EEC.


With particular regard to residues, the review has established that the residues arising from the proposed uses, consequent on application consistent with good plant protection practice, have no harmful effects on human or animal health. The Theoretical Maximum Daily Intake (TMDI; excluding water and products of animal origin) for a 60 kg adult is 36.2 % of the Acceptable Daily Intake (ADI), based on the FAO/WHO European Diet (August 1994). Additional intake from water and products of animal origin are not expected to give rise to intake problems.


The review has identified several acceptable exposure scenarios for operators, workers and bystanders, which require however to be confirmed for each plant protection product in accordance with the relevant sections of the above mentioned uniform principles.


The review has also concluded that under the proposed and supported conditions of use there are no unacceptable effects on the environment, as provided for in Article 4 (1) (b) (iv) and (v) of Directive 91/414/EEC, provided that certain conditions are taken into account as detailed in section 6 of this report.


4. Identity and Physical/chemical properties


The main identity and the physical/chemical properties of MCPA and MCPA-thioethyl are given in Appendix I.


The active substance shall comply with the FAO specification and there seem not to be reasons for deviating from that specification; the FAO specification is given in Appendix I of this report.


The review has established that for the active substances notified by the main data submitters, the Industry Task Force on MCPA Research Data and Oxon Italia SpA, none of the manufacturing impurities considered are, on the basis of information currently available, of toxicological or environmental concern.


In accordance with the provisions of Article 13(5) of Directive 91/414/EEC, Italy is also satisfied, on the basis of the information currently available, that the substances notified by the other data submitters Sanachem do not, in the meaning of Article 13(2) and (5) of the Directive, differ significantly in degree of purity and nature of impurities from the composition registered in the dossier submitted by the main data submitter.


5. Endpoints and related information


In order to facilitate Member States, in granting or reviewing authorisations, to apply adequately the provisions of Article 4(1) of Directive 91/414/EEC and the uniform principles laid down in Annex VI of that Directive, the most important endpoints were identified during the re-evaluation process. These endpoints are listed in Appendix II.


6. Particular conditions to be taken into account on short term basis by Member States in relation to the granting of authorisations of plant protection products containing MCPA


On the basis of the proposed and supported uses (as listed in Appendix IV), the following particular issues have been identified as requiring particular and short term attention from all Member States, in the framework of any authorisations to be granted, varied or withdrawn, as appropriate:


  • Member States must pay particular attention to the protection of aquatic organisms and must ensure that the conditions of authorisation include, where appropriate, risk mitigation measures.



7. List of studies to be generated


No further studies were identified which were at this stage considered necessary in relation to the inclusion of MCPA in Annex I under the current inclusion conditions.


Some endpoints however may require the generation or submission of additional studies to be submitted to the Member States in order to ensure authorisations for use under certain conditions. This may particularly be the case for additional bridging studies in relation to the acceptance of salts and esters of MCPA (including MCPA-thioethyl) other than the acid which was evaluated.


8. Information on studies with claimed data protection


For information of any interested parties, Appendix III gives information about the studies for which the main data submitter has claimed data protection and which during the re-evaluation process were considered as essential with a view to annex I inclusion. This information is only given to facilitate the operation of the provisions of Article 13 of Directive 91/414/EEC in the Member States. It is based on the best information available to the Commission services at the time this review report was prepared; but it does not prejudice any rights or obligations of Member States or operators with regard to its uses in the implementation of the provisions of Article 13 of the Directive 91/414/EEC neither does it commit the Commission.


9. Updating of this review report


The technical information in this report may require to be updated from time to time in order to take account of technical and scientific developments as well as of the results of the examination of any information referred to the Commission in the framework of Articles 7, 10 or 11 of Directive 91/414/EEC. Such adaptations will be examined and finalised in the Standing Committee on the Food Chain and Animal Health, in connection with any amendment of the inclusion conditions for MCPA in Annex I of the Directive.


APPENDIX I


Identity, physical and chemical properties


MCPA








MCPA-acid

MCPA-thioethyl

Common name (ISO)

MCPA

MCPA technical acid

2,4-MCPA (France)

MCPA-thioethyl (BSI, E-ISO)

Phenothiol (JMAF)

Chemical name (IUPAC)

4-chloro-o-tolyoxyacetic acid

S-ethyl 4 chloro-o-tolyloxythioacetate

Chemical name (CA)

(4-chloro-2 methylphenoxy) acetic acid

S-ethyl (4-chloro-2methylphenoxy)ethanethioate

CIPAC No

2

not available

CAS No

94-74-6

25319-90-8

EEC No

202-360-6

not available

FAO SPECIFICATION

 930 g/kg  15 g/kg (1994)

not available

Minimum purity

930 g/Kg minimum

920 g/Kg minimum

Molecular formula

C9H9ClO3

C11H13ClO2S

Molecular mass

200.6


244.7

Structural formula









MCPA-acid

MCPA-thioethyl

Melting point

115.4°C to 116.8°C Purity = 99.5%

41°C to 41.5°C Purity 100%

Boiling point

Decomposition is observed at approx. 290°C

Not determinable

Appearance

Pure: White Solid

Technical: Off white solid

Solid Purity = 100%

Relative density

D4 20 = 1.410 Purity 99.9%

1291 Kg/m3 at 22°C Purity 100%

Vapour pressure

4 x 10-4 Pa at 32°C; 4 x 10-3 Pa at 45°C Purity 99.4%

1.30 x 10-2 Pa at 25°C Purity 100%

Henry's law constant

5.5 x 10-5 Pa.m3/mol at 25°C

2.102 x 10-1 Pa.m3/mol at 25°C

Solubility in water

Unbuffered(pH1) 0.395g/l at 25°C

pH5: 26.22 g/l at 25°C

pH7: 293.90 g/l at 25°

pH9:320.09 g/l at 25°C

Purity 99.4%

2.28 mg/l at 20°C

Purity 100%

Solubility in organic solvents

Solvent

Solubility at 25°C g/l


Toluene 26.5

Dichloromethane 69.2

Methanol 775.6

Propanol-2 425.6

Acetone 487.8

Ethylacetate 289.3

n-Hexane 0.323

n-Octanol 218.3

Purity = 99.4 %

Solvent Solubility at 25°C g/l


Acetone >1000

Methanol 144

Dichloromethane >1000

Ethyl acetate >1000

n-hexane 369

Xylene >1000

Purity 100%

Partition co-efficient (log Pow)

pH1: 2.70 (0.001 Mol/l); 2.80 (0.0001 Mol/l)

pH5: 0.28 (0.01 m/l); 0.59 (0.001 m/l)

pH7: -0.81 (0.01 m/l); -0.71 (0.001 m/l)

pH9: -1.07 (0.01 m/l); -0.88 (0.001 m/l)

Purity 99.4%

4.45 at 25°C

Purity 100%

Hydrolytic stability (DT50)

14C-MCPA acid was stable to hydrolytic degradation

at pH 5, 7 and 9 at 25°C for 30 days.

pH1: DT50 = 5.42 days at 37°

pH4: DT50 = 35.58 days at 25°C; 11.92 days at 40°C

pH7: DT50 = 10.90 days at 25°C; 2.21 days at 40°C

pH9: DT50 = 8.69 hours at 25°C; 1.14 hours at 40°C

Purity 100%

Dissociation constant

pKa = 3.73 (s = 0.07) at 20°C

pKa = 3.73 (s = 0.00) at 25°C

Not determinable

Quantum yield of direct photo-transformation in water at  >290 nm

Estimated Quantum efficiency   0.093

The wavelength applied in this test was 304nm.

Purity = 99.0 %

The quantum yield of Phenothiol was determined to be 8.3 x 10-2 at pH 7

Purity 93.4%

Flammability

MCPA technical acid is not considered highly flammable

Not flammable

Technical purity = 93.8 %

Explosive properties

Study not required

Not explosive. Purity 93.8%

UV/VIS absorption (max.)

No absorption > 290 nm

No absorption > 290 nm

Photostability in water (DT50)

DT50 (aqueous) 25.4 days

Artificial light: DT50 (buffer solution) 17.8 hours

Artificial light: DT50 (river water) 14.8 hours

Natural light DT50 (buffer solution) 74.1 hours

Natural light DT50 (river water) 61.6 hours



APPENDIX II

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