Methods and criteria to assess the eco-toxicity of construction products

Raindrops on coated exterior railings

Statements on the environmental compatibility of exterior construction products are made via eco-toxicological test systems. TZW conducts supplementary screening analysis for organic compounds in eluates.

The project should contribute to harmonising eco-toxicological test methods for construction products to implement life cycle requirements of the Construction Products Regulation. The recommendations prepared in a previous project for a battery of tests for the eco-toxicological assessment as part of the environmental compatibility of construction products for outdoor use (German Environment Agency document 74/2016) were included in the Technical Rule DIN CEN/TR 17105. This shall gain a more binding status when it is converted into a Technical Specification (TS) in the future.

A ring trial according to the provisions of DIN ISO 5726 should be organised and conducted for the quality assurance and validation of the prepared draft guidelines. About 30 construction products will be selected and the available data viewed on inorganic and organic analytical screening. At least 10 of these products will be eluted and investigated in biotests. Flat or monolithic products will then be eluted in a dynamic surface leaching test (DSLT, according to DIN CEN/TS 16637-2), granular products via a percolation test in the upward stream (DIN CEN/TS 16637-3). The aqueous eluates obtained will undergo basic chemical analysis and/or more extensive analysis and full eco-toxicity testing. In the project, TZW is performing GC-MS screening and suspected target analyses using LC-ESI-TOF.

Secondly, proposals should be drafted for three product groups on how to integrate the methods in the criteria for awarding the Blue Angel certification. Suitable award criteria should also be developed for the eco-toxicological assessment. The results will be presented in a workshop in February/March 2021 at the Federal Environment Agency.