ISO 4285-1977 - 中外标准 - - 1977/12 - 废止
Contains guides concerning the procedure to be followed and the precautions to be observed for the taking, preparation and storage of samples with the view of assess their quality. Deals with the means of delivery, containers for taking samples, technical means for mixing and heating systems. Details the sampling of thermal-process and wet-process acids from large containers and mobile tanks and the safety measures. Has also been approved by the IUPAC.
化学分析磷酸化学分析和试验抽样方法抽样chemical analysis and testingsamplingphosphoric acidsampling methods
ISO 1392-1977 - 中外标准 - - 1977/2 - 现行
The method is applicable in the range from about -50 °C to about +250 °C. the determination can be carried out directly on the sample as received, or on the dried sample, or on both. In which of these conditions the sample is to be tested will be stated in the specific test method for each material. The principle is based on cooling the liquid or liquefied sample and observation of the temperature during crystallization under defined conditions. Samples with a higher water content, e.g. pastes, shall be dried before in every case. - Replaces ISO Recommendation R 1392-1970.
结晶化学试验化学分析和试验凝固点测量Chemical analysis and testingCongealing pointCrystallizationMeasurement