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Which exposure time should be used when doing ecotoxicity tests with tire wear particles? 

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Which concentrations of tire wear particles should be used for ecotoxicity testing? 

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Which kind of tire wear particle analyses do you prefer? 

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What has a greater impact on atmospheric transport?

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Which reference materials do you use and for what purpose?

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Which markers should be used for a marker based analyses of tire wear particles?

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Assessment of the current hazard potential

Probability of seeing effects is rather low

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Definition of future threshold values

Probability of seeing effects is higher

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Which markers would you recommend for ecotoxicity tests with plants? (e.g. chlorophyll content)

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Where do you see problems in the research field of tire wear?

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Missing reference standards and particles for experiments

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1. How do environmental factors such as photooxidation, ozonation, and shear stress influence the formation of tire and road wear particles?

2. Leaching and co-transport of microorganic pollutants to roadside soils occurs. Are these pollutants a great environmental concern or benign?

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What are the most effective methods for sampling and analyzing TRWPs on a road surface or roadside soils?

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What sampling preparation techniques are most reliable for enriching TRWPs collected from different environmental matrices?

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Identification and Quantification of TRWP

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Identification and Quantification of TRWP

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Which analytical methods, such as spectroscopy or chromatography, are best suited for accurately identifying and quantifying TRWPs in complex environmental samples?

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What other natural and man-made sources could tire wear markers possibly have?

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long term studies and  the combination of more markers could reveal chronic and less obvious effects.

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long term studies and  the combination of more markers could reveal chronic and less obvious effects.

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Guardrails, car-body parts, other rubber materials, anti-icing fluids,...

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Additives like antioxidants and plasticizers ara also common in other synthetic materials like (geo)textiles.

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Time efficiency?

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1. Degradation of polymer chains due to radiation?

2. Zink in high concentrations harmful, 6-PPD / 6-PPDQ toxic to salmon and other fish larva

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SBR as reference spectra because it's easy to obtain

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working with tire wear particles is quite challenging itself, for example the electrostatic charge makes it difficult to transfer the particles

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for zinc it could be the crash barrier on the side of the road

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Hydrogen peroxide

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Might depend on the purpose: mass based shows no information about particle size, shape and size distribution

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Pyr-GC-MS

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1. Higher shear stresses lead to a higher formation of twps

2. Adsorption of heavy metals to tire wear particles -> transport to other ecosystems where they are leached again

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electrical separation and density separation