提供了与取样有关的某些指示，并指出了制备试样的条件。应强调特殊特性，这些特性使特殊预防措施至关重要，例如吸湿特性、二氧化碳吸收、对容器的腐蚀作用。主溶液的制备是通过将供试品溶解在蒸馏水中或通过将液体供试品直接定量转移到蒸馏水中来进行的- 在容量瓶上做标记。取消并替换ISO建议R 988-1969和ISO建议R 989-1969。

Provides certain indications relating to the sampling and indicates the conditions under which the test sample should be prepared The special properties which make particular precautions essential such as hygroscopic characteristics, absorption of carbon dioxide, corrosive action on containers, should be stressed. The preparation of the main solution is carried out by dissolution of the test portion in distillated water or by transfer of the liquid test portion directly and quantitatively in a one-mark volumetric flask. Cancels and replaces ISO Recommendation R 988-1969 and ISO recommendation R 989-1969.