Abstract: The discharge of municipal wastewater and sewage sludge is the main pathway of synthetic musk entering soil environment. Parameters for the discharge are necessary for ecological risk assessment models, but few have been reported regarding the ecological risk assessment of synthetic musk in soil partly due to the shortage of convenient, quick and efficient techniques for the detection of synthetic musk in the environment. To promote the analytic methodology of synthetic musk, we compared and optimized the techniques for extracting two typical kinds of synthetic musk, galaxolide (HHCB) and tonalid (AHTN), in municipal wastewater by solid-phase extraction and liquid-liquid extraction, and in dehydrated sludge by soxhlet extraction and accelerated solvent extraction (ASE). The results showed that liquid-liquid extraction and ASE followed by silica gel column cleaning process had higher recovery in detecting synthetic musk in water and sludge samples. The two optimized methods were adopted to detect the HHCB and AHTN concentrations in the inflow and effluent water and the dehydrated sludge from a Beijing sewage treatment plant, and their concentrations were 897-1270 ng·L^-1 and 331-488 ng·L^-1 in inflow water, 201-226 ng·L^-1 and 65-130 ng·L^-1 in effluent water, and 137-348 ng·g^-1 and 64-138 ng·g^-1 in dehydrated sludge, respectively.

Key words: Hydraulic engineering, River ecosystem, Ecosystem services, Assessment approaches