Derwent Estuary Ambient Water Quality monitoring program - Site LB

Site LB is sampled monthly by the Derwent Estuary Program 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

LB测点（Site LB）由德文特河口项目（Derwent Estuary Program）按月实施采样，作为德文特河环境水质监测计划（Derwent Ambient Water Quality monitoring program）的组成内容。自2003年起，诺斯克斯科格博耶尔纸业（Norske Skog Boyer）、尼尔斯塔霍巴特分公司（Nyrstar Hobart）与塔斯马尼亚州政府三方合作，在德文特河口全域至多28个测点按月开展环境水质监测工作。本次监测由三支独立的船舶采样团队分别执行，但所有采样活动均协调安排在每月的同一天进行。在每个测点，工作人员使用经过校准的传感器对水温、盐度、pH值、溶解氧及浊度开展现场原位测量。水体透明度采用塞氏盘（secchi disk）进行测定。采集表层与底层水样，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、有机碳以及锌元素含量。在多数测点，还会使用塑料采集管采集深度整合水样，用于叶绿素a（chlorophyll a）的分析检测。河口中部与外湾区域的底层水样采用尼斯金采水器（niskin bottle）采集。河口上游测点则通过泵体完成采样瓶的注样操作。所有水样均交由获得澳大利亚国家检测机构协会（National Association of Testing Authorities）认可的塔斯马尼亚分析服务实验室（Analytical Service Tasmania）开展分析检测。各监测测点的水深为2米。