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监测点（Site LB）由德文特河口计划（Derwent Estuary Program）纳入德文特河口环境水质监测计划（Derwent Ambient Water Quality monitoring program），并按月开展采样工作。
自2003年起，诺斯克斯科博耶尔（Norske Skog Boyer）、尼尔斯塔霍巴特（Nyrstar Hobart）与塔斯马尼亚州政府，在整个德文特河口沿线的至多28个监测点位开展月度环境水质监测工作。本次监测由三支独立的船舶采样团队负责执行，但所有采样活动均协调安排在每月的同一天进行。
在每个监测点位，均使用经校准的传感器开展原位现场测定，检测指标包括温度、盐度、pH值、溶解氧及浊度。同时采用塞氏圆盘（Secchi disk）测定水体透明度。采集表层与底层水样，用于分析真色、总悬浮固体（TSS, total suspended solids）、总态与溶解态营养盐、有机碳及锌。在多数监测点位，还会使用塑料采集管采集深度整合水样以检测叶绿素a。中河口与外河口的底层水样采用尼斯金采水器（Niskin bottle）采集，而上河口监测点位则通过泵体完成采样瓶的灌装。所有水样均送至塔斯马尼亚分析服务中心（Analytical Service Tasmania）进行分析，该机构为澳大利亚国家检测机构协会（National Association of Testing Authorities）认可的实验室。该LB监测点的水深为2米。