ISO 18412:2005规定了质量浓度在2微克/升至50微克/升之间的饮用水中铬（VI）的测定方法。对于较高浓度的测定，在分析之前对样品进行稀释。如果基质不含干扰还原剂，该方法也可用于弱污染的地下水和地表水。该方法不适用于河口水和海水，因此用户负责验证这些基质的方法。

ISO 18412:2005 specifies a method for the determination of chromium(VI) in drinking water in mass concentrations between 2 micrograms per litre and 50 micrograms per litre. For the determination of higher concentrations, the sample is diluted prior to analysis. The method may also be applied to weakly polluted ground and surface water, provided the matrix does not contain interfering reducing agents. This method was not used for estuarine water and seawater, so the user is responsible for the validation of the method for these matrices.