Phthalates and Nonylphenols in Roskilde Fjord

3.3 Samples of fjord sedimentFinally, sediment samples in the fjord was taken during 1996, most ofthem in Roskilde Vig in a fan-shaped geometry near the outlet from RoskildeWWTP (map Figure 2).NSludgeamendedfieldStation 2Roskilde Vig⊗∆WWTP outletFigure 21 kmRoskildeharbourLocal map of Roskilde Vig, 1:25000, showing locations of sedimentsampling sites and sources.x Sampling sites ⊗ Sediment core∆ WWTP outlet ∇ Sludge dumping site∇Roskilde CityThe sampling design is based on investigations carried out 1994-95 forRoskilde County Authority and Roskilde Municipality by Danish HydraulicInstitute and Water Consult. According to these reports the currentis circulating in the Vig mainly driven by the wind, the tide playing aminor role. The wind is predominantly in the West direction, leading toan South-East water current in the area having a velocity of 2-6 cm/sec.The WWTP average outlet of waste water is 19000 m 3 /day.Some samples were taken further North in Roskilde Vig and in RoskildeBredning, on the same locations as the monthly water samples. Thesediment also included samples from the neighbouring fjord Isefjord, believedto be lesser polluted, for comparison. These fjord sediment sampleswere taken by a diver. All sediment samples were taken in the upper2-5 cm of the sediment, with the exception of the core, which reached adepth of about 22 cm into the sediment. An overview of these samples isshown in Table 4.16The sampling methods are described more detailed in the AnalyticalChapter.