Netherlands National Monitoring of General Water Quality in Central North Sea Region (1975-)

MON*CHEMIE is a part of the Monitoring programme of the National Water Systems (in Dutch : Monitoring Waterstaatkundige Toestand des Lands; MWTL). The primary goal of the MWTL programme is to provide physical, chemical and biological information in relation to long term developments. So the focal point for the monitoring programme is based on trend detection. Another aim is to check the compliance to national and international assessment criteria. The Dutch marine and brackish waters are dived into areas. In field GEOGRAPHIC COVERAGE the area is mentioned. In MON*CHEMIE chemical parameters are determined in surface water, suspended matter, sediment and biota. The starting date mentioned is not necessarily the same for every parameter or location, this can differ from one parameter or location to another. Depending on the parameter and the location most samples are collected on a weekly, monthly or 3 monthly base. The given date is the first year data is available of one or more locations. During the given period more or less locations can be sampled due to changes in the national monitoring programme. Sampling and analysing the samples are carried out by Standard Operating Procedures (SOP's). - Surface Water: Field observations are carried out with sensors and samples are taken to be analysed in the laboratories. The parameters oxygen concentration, oxygen percentage, pH, salinity, suspended matter, dissolved organic carbon, bound organic carbon, total organic carbon, mineral oil are analysed. - Suspend Matter: This part of the programme started in 1989. Samples are taken by centrifuge. The parameters grain size, percentage organic carbon are analysed. – Sediment: The parameters grain size, percentage organic carbon are analysed. Samples are taken by boxcorer. – Biota: No programme running. For actual planning: www.waterplan.nl

MON*CHEMIE乃国家水域监控系统（荷兰语：国家水系状况监测，简称MWTL）的一部分。MWTL项目的主要宗旨在于提供有关长期发展的物理、化学及生物信息。因此，监测项目的核心焦点集中于趋势探测。此外，项目另一目标在于验证是否符合国家及国际评估标准。荷兰海洋及半咸水域被划分为若干区域。在实地地理覆盖范围内，具体区域被明确指出。在MON*CHEMIE中，化学参数在表层水、悬浮物、沉积物及生物群落中得以测定。提及的起始日期对于每个参数或位置而言并非必然相同，此日期可能因参数或位置的不同而有所差异。根据参数和位置的不同，大多数样本以每周、每月或每三个月为一周期进行采集。所提供的日期为某一或多个位置首次数据可用的年份。在给定期间内，由于国家监测计划的变动，采样位置可能会有所增减。采样与分析样本均按照标准操作程序（SOP）进行。

表层水：实地观测通过传感器进行，样本被采集以供实验室分析。分析参数包括氧气浓度、氧气百分比、pH值、盐度、悬浮物、溶解有机碳、结合有机碳、总有机碳及矿物油。

悬浮物：本部分项目自1989年开始。样本通过离心机采集。分析参数包括颗粒大小、有机碳百分比。

沉积物：分析参数包括颗粒大小、有机碳百分比。样本通过采样箱采集。

生物群落：目前无相关项目运行。

实际规划请访问：www.waterplan.nl