本文件规定了连续流动分析（CFA）方法，用于测定质量浓度在0.01 mg/l至1.00 mg/l P范围内的正磷酸盐和质量浓度在0.10 mg/l至10.0 mg/l P范围内的总磷。该方法包括有机磷化合物的消化和无机聚磷酸盐化合物的水解，可手动进行，如ISO 6878和参考文献[4]、[5]和[7]所述，或使用集成的紫外线（UV）消化和水解装置。 本文件适用于各种类型的水，如地下水、饮用水、地表水、渗滤液和废水。可通过改变操作条件来改变应用范围。 该方法也适用于海水分析，但通过使载体和校准溶液适应样品的盐度，灵敏度会发生变化。 根据所需的范围，它也适用于使用10 mm至50 mm反应杯进行分析。为了达到极高的灵敏度，可以使用250mm和500mm长的毛细管流动池（LCFC）。然而，该方法并未针对这两种用途进行验证。可能需要更改灵敏度和校准溶液。 附录A提供了CFA系统的示例。附录B给出了实验室间试验的性能数据。附录C给出了通过CFA和氯化锡还原测定正磷酸盐-P和总磷的信息。

This document specifies continuous flow analysis (CFA) methods for the determination of orthophosphate in the mass concentration range from 0,01 mg/l to 1,00 mg/l P, and total phosphorus in the mass concentration range from 0,10 mg/l to 10,0 mg/l P. The method includes the digestion of organic phosphorus compounds and the hydrolysis of inorganic polyphosphate compounds, performed either manually, as described in ISO 6878 and in References [4], [5] and [7], or with an integrated ultraviolet (UV) digestion and hydrolysis unit. This document is applicable to various types of water, such as ground, drinking, surface, leachate and waste water. The range of application can be changed by varying the operating conditions. This method is also applicable to the analysis of seawater, but with changes in sensitivity by adapting the carrier and calibration solutions to the salinity of the samples. It is also applicable to analysis using 10 mm to 50 mm cuvettes depending on the desired range. For extreme sensitivity, 250 mm and 500 mm long way capillary flow cells (LCFCs) can be used. However, the method is not validated for these two uses. Changes in sensitivity and calibration solutions could be required. Annex A provides examples of a CFA system. Annex B gives performance data from interlaboratory trials. Annex C gives information of determining orthophosphate-P and total-P by CFA and tin(II) chloride reduction.