Derwent Estuary Ambient Water Quality monitoring program - Site GB

Site GB is sampled monthly by Nyrstar Hobart as part of the Derwent Ambient Water Quality monitoring program.\nSince 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. \nAt 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

GB站点由霍巴特奈斯特（Nyrstar Hobart）按月开展采样，作为德文特河（Derwent）环境水质监测计划的组成部分。
自2003年起，诺斯克斯科格博耶尔（Norske Skog Boyer）、霍巴特奈斯特与塔斯马尼亚州政府三方，已在德文特河口湾全境最多28个监测站点按月实施环境水质监测工作。
本次监测由三支独立的船基采样团队分别执行，但所有采样活动均协调为每月同一天开展。
在每个监测站点，均使用经校准的传感器开展原位现场测量，涵盖温度、盐度、pH值、溶解氧与浊度。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、总悬浮颗粒物（Total Suspended Solids, TSS）、总营养盐与溶解态营养盐、有机碳及锌含量。在多数站点，还会使用塑料管采集水深整合水样，用于叶绿素a（Chlorophyll a）的分析。
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；河口上游站点则使用泵体完成采水瓶的灌装。
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，该中心为澳大利亚国家检测机构协会（National Association of Testing Authorities, NATA）认证实验室。
本次监测的站点水深为2米。