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首页> 外文会议>The proceedings of AD 2005: 50 years of analytical solutions >ON-LINE MONITORING OF SELECTED CHEMICALS IN SURFACE WATER – A CASE STUDY OF CHALLENGES AND EXPERIENCES
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ON-LINE MONITORING OF SELECTED CHEMICALS IN SURFACE WATER – A CASE STUDY OF CHALLENGES AND EXPERIENCES

机译：地表水中化学物质的在线监测-以挑战和经验为例

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摘要

Environmental measurements, based on regulations or driven by the proximity of industrialrnplants and population, frequently require the continuous monitoring of water. The objective ofrnthe monitoring of chemical contamination is to ensure suitable water quality. When thernconcentration of contaminants can change rapidly, on-line monitoring is desirable. Thernchallenging task for on-line monitoring of constituents in water is the continuous determinationrnof selected pollutants at very low concentration levels. This is especially difficult when the waterrnmatrix is subject to environmental changes such as widely varying particulate loading andrnconsequently makes the measurement task often unsuitable for simple analytical techniques. Thernreliability and long term stability of the system solution requires suitable filtration andrncontinuous extraction of the constituents from the water matrix. Furthermore selectivity andrndetectability at least in the low ppb range has to be ensured to have automatic and unattendedrnoperation over long periods of time.rnThis paper describes the task and system configuration of an analytical system utilizing processrngas chromatography that is continuously measuring more than 60 chemicals in surface water. Itrnis used to ensure fresh water supply from a major shipping channel. The paper specificallyrnoutlines the operational challenges encountered such as automatic cleaning of filtering andrnextraction device, maintenance issues and experiences gained during operation over a period ofrnseveral years resulting in continuous operation despite the challenges of the variety ofrncomponents, the specific water matrix conditions and the location.
机译：基于法规或受工业厂房和人口接近的环境测量，经常需要对水进行连续监测。监测化学污染的目的是确保合适的水质。当污染物的浓度可以快速变化时，就需要进行在线监测。在线监测水中成分的艰巨任务是连续测定非常低浓度水平的选定污染物。当水基质易受环境变化（例如颗粒物负载变化很大）的影响时，这尤其困难，因此使测量任务通常不适合简单的分析技术。系统溶液的可靠性和长期稳定性要求适当过滤并从水基质中连续提取成分。此外，还必须确保至少在低ppb范围内的选择性和可检测性，以使其能够长时间长时间自动运行且无人值守。本文描述了利用过程气相色谱法连续分析表面中60多种化学物质的分析系统的任务和系统配置。水。 Itrnis过去曾确保从主要运输渠道供应淡水。本文特别概述了所遇到的运行挑战，例如自动清洁过滤和萃取设备，维护问题以及在运行过程中获得的经验，尽管面临着各种组件，特定水基质条件和位置的挑战，但这些运行过程导致连续几年运行。

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