Derwent Estuary Ambient Water Quality monitoring program - Site U12

Site U12 is sampled monthly by Norske Skog as part of the Derwent Ambient Water Quality monitoring program.Since 2003, ambient water quality monitoring has been carried out on a monthly basis at up to 28 sites throughout the Derwent estuary by Norske Skog Boyer, Nyrstar Hobart and the State Government. Monitoring is carried out by three different boat-based sampling parties, but is co-ordinated to occur on the same day each month. At each site, in-situ field measurements are taken using calibrated sensors for temperature, salinity, pH, dissolved oxygen and turbidity. Water clarity is also measured using a secchi disk. Surface and bottom water samples are collected for analysis of true color, total suspended solids(TSS), total and dissolved nutrients, organic carbon and zinc. at most sites, depth integrated samples are also collected for chlorophyll a using a plastic tube. Bottom samples in the Middle and Outer estuary are collected using a niskin bottle. Pumps are used in the upper estuary site to fill up the bottles. All water samples are analysed at Analytical Service Tasmania, a National Association of Testing Authorities-accredited laboratory. Monitoring site depth is 2 meters

U12监测站点由诺斯克纸业（Norske Skog）作为德文特河（Derwent）环境水质监测计划的组成部分按月开展采样工作。自2003年起，诺斯克纸业博伊尔分厂（Norske Skog Boyer）、尼尔斯塔霍巴特分厂（Nyrstar Hobart）与塔斯马尼亚州政府合作，在整个德文特河口沿线至多28个站点按月实施环境水质监测。监测工作由三支独立的船舶采样团队分别执行，但协调统一在每月的同一天开展。在每个监测站点，均使用经过校准的传感器采集温度、盐度、pH值、溶解氧及浊度的原位现场测量数据；水体透明度采用塞氏圆盘（Secchi disk）进行测定。采集表层与底层水样，用于分析真色、总悬浮固体（TSS）、总营养盐与溶解态营养盐、有机碳及锌的含量。在多数站点，还会使用塑料管采集深度整合水样以开展叶绿素a的检测分析。中河口与外河口区域的底层水样采用尼斯金采水器（Niskin bottle）采集，而上河口站点则通过泵体完成水样瓶的灌装。所有水样均送至塔斯马尼亚分析服务中心（Analytical Service Tasmania）进行检测，该实验室为国家检测机构协会（National Association of Testing Authorities）认证的合规实验室。该监测站点的水深为2米。