There has been a noticeable increase of interest concerning knowledge about the odour signature from military explosives. A new extraction method for explosives in soil has been the main focus this year. Preliminary results are very promising implying that the method works for HMX, RDX, PETN and tetryl as well as for TNT and related compounds. It gives cleaner extracts and is less work intensive than the present method for TNT, which makes it easier and faster. Before the method could be considered as established much work though remains on optimising and validation. Synthesis of isotope marked TNT has been performed to be used as an internal standard, thus increasing the quality control of the explosives analysis. The filter that seemed so promising for sampling of explosives in water did not work when the method was to be validated. To exclude the possibilities of leakage causing these problems a new filter holder will be tested. During the year preparations to study the complex process of transportation of explosives and related compounds in soil in a controlled laboratory environment has been made. The choice of explosives and soil type can be varied, as well as temperature and moisture. In this way the odour signature caused by different conditions can be studied. The preliminary results from the first experiments have been promising. More experiments will be performed next year.