1.1 本测试方法包括在线腐蚀产物（金属）监测系统的操作、校准和数据解释。监测系统基于膜过滤器（悬浮固体）或树脂膜（离子固体）上所含金属的x射线荧光（XRF）分析。由于XRF检测器对一系列发射能量敏感，因此本试验方法适用于同时监测流动样品中几种金属的浓度水平，包括钛、钒、铬、锰、铁、钴、镍、铜、锌、汞、铅和其他金属。大多数金属的检测限可以达到低于1ppb。 1.2 该测试方法包括对包括在线金属监测系统的设备的描述，以及操作程序和系统规范。 1.3 以国际单位制表示的值应视为标准值。本标准不包括其他测量单位。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 发电厂蒸汽和水回路中的微粒和溶解金属形式的腐蚀产物是发电厂操作员非常关注的问题。 除了表明工厂中发生的腐蚀程度外，腐蚀产物的存在对工厂的完整性和效率有有害影响。沉积的腐蚀产物提供了在低浓度下无害的化学物质可能集中到腐蚀水平并引发沉积物下腐蚀的场所。此外，给水中的腐蚀产物进入蒸汽发生部件，在那里，传热表面上的沉积会降低设备的整体效率。 5.2 大多数工厂执行某种类型的腐蚀产物监测。最常见的方法是长时间取样，最多几天，然后对采集的样品进行实验室分析，得出采集时间段内的平均腐蚀产物水平。这种方法被称为综合抽样。 通过在线监测中更频繁的测量，可以获得腐蚀产物传输的时间分布。可以检测和测量瞬时高腐蚀产物水平，这无法通过集成采样技术实现。有了这些新的可用数据，电厂操作员可以开始将高腐蚀产物水平的时期与可控的电厂运行事件联系起来。通过这种方式，操作员可以就腐蚀产物的产生和运输做出更明智的操作决策。

1.1 This test method covers the operation, calibration, and data interpretation for an on-line corrosion product (metals) monitoring system. The monitoring system is based on x-ray fluorescence (XRF) analysis of metals contained on membrane filters (for suspended solids) or resin membranes (for ionic solids). Since the XRF detector is sensitive to a range of emission energy, this test method is applicable to simultaneous monitoring of the concentration levels of several metals including titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, mercury, lead, and others in a flowing sample. A detection limit below 1 ppb can be achieved for most metals. 1.2 This test method includes a description of the equipment comprising the on-line metals monitoring system, as well as, operational procedures and system specifications. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Corrosion products, in the form of particulate and dissolved metals, in the steam and water circuits of electricity generating plants are of great concern to power plant operators. Aside from indicating the extent of corrosion occurring in the plant, the presence of corrosion products has deleterious effects on plant integrity and efficiency. Deposited corrosion products provide sites at which chemicals, which are innocuous at low levels, may concentrate to corrosive levels and initiate under-deposit corrosion. Also, corrosion products in feedwater enter the steam generating components where deposition on heat transfer surfaces reduces the overall efficiency of the plant. 5.2 Most plants perform some type of corrosion product monitoring. The most common method is to sample for long time periods, up to several days, after which laboratory analysis of the collected sample gives the average corrosion product level over the collection time period. This methodology is referred to as integrated sampling. With the more frequent measurements in the on-line monitor, a time profile of corrosion product transport is obtained. Transient high corrosion product levels can be detected and measured, which cannot be accomplished with integrated sampling techniques. With this newly available data, plant operators may begin to correlate periods of high corrosion product levels with controllable plant operating events. In this way, operators may make more informed operational decisions with respect to corrosion product generation and transport.