ISO/TS 17951-2:2016规定了通过连续流动分析（CFA）测定水、废水和废水中氟化物的方法。任何不溶或络合的氟化物都会通过自动连续流动蒸馏程序从硫酸/磷酸转化为氟离子。蒸馏液中的氟离子通过镧-茜素络合剂流动分析和光谱检测进行测量。本方法适用于工业废水、废水、地表水、地下水、渗滤液。当该方法用于饮用水分析时，不需要加热器和蒸馏装置。 一些饮用水含有高浓度的铝和铁。对于饮用水，ISO/TS 17951-2:2016适用于低干扰饮用水。不适用于含有大量悬浮物的样品。 ISO/TS 17951-2:2016中描述了两个工作范围: -工作范围I:0.1 mg/l至1.0 mg/l； -工作范围二:1.0毫克/升至10毫克/升。 校准溶液的规格应相应调整。

ISO/TS 17951-2:2016 specifies a method for the determination of fluoride in waters, waste waters and effluents by continuous flow analysis (CFA). Any insoluble or complexed fluoride is converted to fluoride ion by an automated continuous flow distillation procedure from sulfuric/phosphoric acid. Fluoride ion in the distillate is measured using flow analysis with lanthanum alizarin complexone and spectrometric detection. This method is applicable to industrial waste waters, effluents, surface waters, ground waters, leachates. When this method is applied to the analysis of drinking water, a heater and a distillation unit is unnecessary. Some drinking water contains high concentration of aluminium and iron. In the case of drinking water, ISO/TS 17951-2:2016 is appropriate to drinking water with low interferences. It is not applicable to samples which contain large amount of suspended matter. In ISO/TS 17951-2:2016, two working ranges are described: - working range I: 0,1 mg/l to 1,0 mg/l; - working range II: 1,0 mg/l to 10 mg/l. The specification of the calibration solutions are to be adapted accordingly.