ISO/TS 15923-2:2017规定了使用离散分析系统通过光度测定自动测定铬（VI）、氟化物、总碱度、总硬度、钙、镁、铁、铁（II）、锰和铝的方法。应用领域是水（地下水、饮用水、地表水、废水、洗脱液和锅炉水）。该方法也适用于标准溶液和对照溶液的矩阵匹配的海洋水域。请注意，如果样品中含有颗粒物，某些参数，尤其是铁、锰和铝，以及可能的铬（VI）、钙和镁，可能无法完全量化。 只要不超过反应混合物的缓冲能力，样品可以在酸中消化。此类程序超出了ISO/TS 15923-2:2017的范围，该标准最适用于现场过滤后溶解金属的测定。

ISO/TS 15923-2:2017 specifies methods for the automatic determination of chromium(VI), fluoride, total alkalinity, total hardness, calcium, magnesium, iron, iron(II), manganese and aluminium with photometric determination using a discrete analysis system. The field of application is water (ground, potable, surface, waste, eluates and boiler water). The method can also be applied to marine waters with matrix matching of standard and control solutions. Note that some parameters, notably iron, manganese and aluminium and possibly chromium(VI), calcium and magnesium may not be completely quantified if the sample contains particulates. Samples can be digested in acid, as long as the buffering capacity of the reaction mixture is not exceeded. Such procedures are beyond the scope of ISO/TS 15923-2:2017, which is best suited to the determination of dissolved metals following on-site filtration.