Christian Stamm, co-author of the study and deputy head of Eawag’s Department of Environmental Chemistry, emphasises the significance of these unambiguous findings: “Recording peak concentrations is vital for the ecotoxicological assessment of contamination in surface waters. In the case of certain pesticides, even peaks lasting less than an hour have adverse effects on aquatic organisms. And if peak concentrations occur repeatedly, a second or third peak can have a greater impact still – even if it’s smaller than the first – because the organisms haven’t been able to recover in the meantime. Composite samples overlook this risk.”
Ready for the backpack soon?
The researchers involved in the MS2field project are confident that their automatic measurement platform has a promising future. In terms of possible applications, the environmental chemist Heinz Singer cites measurements of the intake and effluent of a wastewater treatment plant as one example. Here, the online data could help to optimise removal efficiency for trace substances or to contain highly contaminated water in the event of rainfall. MS2field could conceivably also be used in drinking water monitoring thanks to the dramatically reduced time frame between sampling and the availability of results, which has often been lengthy until now. With ongoing advances in digitalisation and miniaturisation, Singer is certain that MS2field will no longer take up an entire trailer in a few years’ time. Rather, users will benefit from portable mini-laboratories that are suitable for use in the field. “We’ve taken some important steps towards this development,” he says, pulling his mobile phone out of his pocket in order to call up the results of the latest measurements with MS2field at a wastewater treatment plant.