![]() These values are almost identical to those reported for mercury in the previous assessment period 2003–2007 (0.18–0.22 mg/kg).įigure 2: Annual average calculated mercury concentration (mg/kg, dw) in dredged material deposited in the OSPAR Maritime Areaīeneficial use of dredged material (such as for beach nourishment and sediment recharge) has been monitored by OSPAR since 2013. Annual average mercury concentration varied between 0.17 and 0.23 mg/kg. Although yearly fluctuations can be seen, there do not appear to be any meaningful increases or decreases across the entire assessment period. The calculated average concentrations, in mg/kg, dry weight (dw), for the trace metals are comparable to those described in the OSPAR Quality Status Report 2010. Changes in total dredging quantities and total contaminant loads are dependent on external factors, including variation in sediment siltation rates due to storm events. Total amounts, in million tonnes, of dredged material deposited in the OSPAR Maritime Area per country over the period 2008–2014Īverage contaminant concentrations and total loads per country were calculated for cadmium, mercury, lead and tributyltin (TBT) for the period 2008–2014. This value includes material from capital and maintenance dredging. Over one thousand million tonnes of dredged material were deposited in the OSPAR Maritime Area during this time. The most recent assessment of dredged material, for the period 2008–2014, was undertaken as part of OSPAR’s 2017 Intermediate Assessment of the state of the Marine Environment of the North-East Atlantic. Trends in dumping and dredging Environmental impacts of dumping and dredging Management and regulation Trends in dumping and dredging
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