[en] The effectiveness of dispersants for use under Arctic conditions was tested using the IFP dilution test (Bocard et al., 1990). Arctic conditions in this context are defined as 0 degree C temperature and water salinities of 0.5% and 3.3%. The study was performed in two steps, first with a screening activity where 14 dispersants were tested on water-in-oil (w/o) emulsions from two weathered oil types. In the next step, the five most promising dispersants were tested on both weathered water-free oils and w/o emulsions from four different oil types. The results show that many of the most used dispersants which previously have shown an excellent effectiveness at 3.3% salinity may have a very low effectiveness at 0.5% salinity. Recently developed products specially designed for low salinity use such as Inipol IPF are effective at low salinities, but suffer from a rather poor effectiveness at high salinities. This is of significant operational importance in Arctic oil spill combat operations, since the salinity may vary due to ice melting. The study shows the need for development of dispersants with high effectiveness both at low temperature and over a wide range of salinities. 10 refs., 3 figs., 3 tabs