Safe re-entry for workers into plant protection product treated crops

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The report analyses how long a worker should wear gloves when working in crop that has been treated with plant protection products. Normally a period of 2 weeks is recommended for wearing protective gloves but the RIVM method allows a more specific calculation of the length of that period. The report recommends including the approach into the authorisation of plant protection products. 

Workers are exposed to plant protection products (PPPs) when they enter treated crops for crop treatment, harvest or crop inspections. Before a plant protection product is authorized for sell and use, a safety assessment has to be performed. Commissioned by the ministry of SZW (Dutch Ministry of Social Affairs and Employment) RIVM has provided information to answer three itself independent questions which all relate to worker PPPs safety assessment.

RIVM developed a methodology to calculate product-specific personal protective equipment required interval for workers entering pesticide -sprayed crops. Currently for workers gloves can be prescribed on the label of a PPP. However there is no information on the label about the duration of the obligatory use of gloves. In most cases a general period of twee weeks is used, the new methodology provides a way to refine the two week period. RIVM recommends to include the period into the EU harmonised method for worker exposure estimation, the period can then be set on the label of national authorised PPP.

RIVM proposes a protocol to investigate the dermal absorption of dried residue which was available in the scientific literature. To assess if crops can be handled safely, dermal absorption absorption of dried residue is required. Currently dermal absorption is investigated with fluids. Before the protocol can be used internationally, it should be approved by the Organisation for Economic Co-operation and Development (OECD). RIVM therefore recommends to further investigate whether this protocol can be submitted for OECD approval.

Chemical substances can be classified based on their properties: for example a notification for health hazard. A substance can cause irritation of the skin or eyes or can cause allergic reactions. This is also applicable substances in PPPs. PPPs are used and sprayed diluted. For safety of workers it is therefore of importance to know the hazardous properties of the diluted PPP and it’s dried foliar residue. RIVM recommends to test the hazardous properties of some diluted PPPs and it’s dried foliar residue.