Derwent Estuary Ambient Water Quality monitoring program - Site U5

Site U5 is sampled monthly by Nyrstar Hobart 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 metersU5采样点由霍巴特奈斯特（Nyrstar Hobart）作为德文特河（Derwent）环境水质监测项目的组成部分，按月开展采样工作。 自2003年起，博耶诺斯克司克（Norske Skog Boyer）、霍巴特奈斯特（Nyrstar Hobart）以及塔斯马尼亚州政府，已在整个德文特河河口区域的至多28个采样点按月实施环境水质监测。本次监测由三支独立的船基采样团队分别开展，但统筹协调为每月同一天完成采样。 在每个采样点，均使用经过校准的传感器进行现场原位测定，检测指标包括温度、盐度、pH值、溶解氧及浊度；同时采用塞氏盘（Secchi disk）测定水体透明度。采集表层及底层水样，用于分析水体真色、总悬浮颗粒物（TSS）、总营养盐与溶解态营养盐、有机碳及锌含量。在多数采样点，还会通过塑料管采集全深度积分水样，用于叶绿素a（Chlorophyll a）的分析。在河口中部及外河口区域，使用尼斯金采水器（Niskin bottle）采集底层水样；在上游河口采样点，则采用水泵完成采水瓶的灌装。 所有水样均送至塔斯马尼亚分析服务公司（Analytical Service Tasmania）进行检测分析，该机构为澳大利亚国家测试机构协会（National Association of Testing Authorities，NATA）认证的实验室。各监测采样点的水深为2米。