BS ISO 20289:2018为使用全反射X射线荧光（TXRF）仪器的技术人员提供了一种化学方法，根据良好实践，以规定的准确度和精密度对水样进行测量。目标用户是在对大量样本进行常规分析的实验室中确定的，这些样本也符合ISO/IEC 17025。本文件规定了测定水中溶解元素含量的方法（例如，饮用水、地表水和地下水）。考虑到特定的和额外发生的干扰，也可以测定废水和洗脱液中的元素。本文件不包括取样、稀释和预浓缩方法。可以用本方法确定的元素可能会根据X变化- 仪器的射线源。此处不考虑健康、安全或商业方面。工作范围取决于矩阵和遇到的干扰。在饮用水和相对未受污染的水中，大多数元素的定量限在0001 mg/l和0.01 mg/l之间。工作范围通常包括0001 mg/l和10 mg/l之间的浓度，具体取决于元素和预定义要求。例如，附录B报告了水的TXRF分析方法的完整验证，该方法使用的仪器以钼作为X射线源，并使用Ga作为校准的内部标准。大多数元素的定量限值受空白污染的影响，主要取决于可用的实验室空气处理设施、试剂纯度和实验室器具的清洁度。 交叉引用:ISO 5667-3ISO 5725-2JCGM 100ISO 5667-1ISO 17331ISO 14706GUMISO 5725-1ISO 3696ISO/TS 18507:2015购买本文件时提供的所有当前修订版均包含在购买本文件中。

BS ISO 20289:2018 provides a chemical method for technicians working with Total Reflection X-ray Fluorescence (TXRF) instrumentation to perform measurements of water samples, according to good practices, with a defined degree of accuracy and precision. Target users are identified among laboratories performing routine analysis of large numbers of samples, which also comply with ISO/IEC 17025.This document specifies a method to determine the content of elements dissolved in water (for example, drinking water, surface water and ground water). Taking into account the specific and additionally occurring interferences, elements can also be determined in waste waters and eluates. Sampling, dilution and pre-concentration methods are not included in this document.Elements that can be determined with the present method may change according to the X-ray source of the instrument. No health, safety or commercial aspects are considered herewith.The working range depends on the matrix and the interferences encountered. In drinking water and relatively unpolluted waters, the limit of quantification lies between 0,001 mg/l and 0,01 mg/l for most of the elements. The working range typically covers concentrations between 0,001 mg/l and 10 mg/l, depending on the element and predefined requirements.Annex B reports, for example, the complete validation of the method of TXRF analysis of water performed with instrumentation that has Mo as the X-ray source and uses Ga as the internal standard for calibration.Quantification limits of most elements are affected by blank contamination and depend predominantly on the laboratory air-handling facilities available, on the purity of reagents and the cleanliness of labware.Cross References:ISO 5667-3ISO 5725-2JCGM 100ISO 5667-1ISO 17331ISO 14706GUMISO 5725-1ISO 3696ISO/TS 18507:2015All current amendments available at time of purchase are included with the purchase of this document.