Derwent Estuary Ambient Water Quality monitoring program - Site U19

Site U19 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

U19监测点位由Norske Skog按月开展采样，作为德文特河环境水质监测计划的组成部分。
自2003年起，Norske Skog Boyer、Nyrstar Hobart与塔斯马尼亚州政府联合在德文特河口沿线最多28个点位按月实施环境水质监测。本次监测由三支独立的船舶采样团队执行，但所有采样均协调安排在每月的同一天进行。
在每个监测点位，均使用经过校准的传感器对水温、盐度、pH值、溶解氧及浊度开展原位现场测量；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，用于检测真色、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。在大多数点位，还会使用塑料管采集深度整合水样以检测叶绿素a含量。在河口中部与外河口区域，采用尼斯金采水器（Niskin bottle）采集底层水样；在上河口点位则使用泵体灌满采样瓶。所有水样均送至经国家检验机构协会（National Association of Testing Authorities）认证的Analytical Service Tasmania实验室进行分析。各监测点位的监测水深为2米。