ISO-3195-1975.pdf
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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANOARDlZATlON .MEXaYHAPOllHAI OPTAHH3AUMR II0 CTAHAAPTL13AUAM.ORGANISATION INTERNATIONALE DE NORMALlSATlON Sodium hydroxide for industrial use - Sampling - Test sample - Preparation of the main solution for carrying out certain determinations H
2、ydroxyde de sodium 5 usage industriel - Pr6l - the laboratory sample shall be stored in an airtight bottle, protected from contact with the atmosphere; - the bottle shall be made of a material which does not contaminate the sample with the elements to be determined (for example, a silica-free materi
3、al such as polyethylene, if the determination of silica content is intended). 2.2 For the methods of sampling, and the number of portions to be drawn from a given quantity, see IS0 . . .I) 3 TEST SAMPLE 3.1 The laboratory sample shall be protected from the atmosphere and handled in such a way that n
4、o appreciable absorption of water or carbon dioxide is possible during the operations. Crushing or grinding in a mortar, if necessary, shall be carried out as rapidly as possible in an atmosphere of maximum dryness. It is recommended that these operations should be carried out in a glove box from wh
5、ich moisture and carbon dioxide have been removed by the introduction, at least 1 h before the sample is treated, of flat dishes, one containing phosphorus(V) oxide and another potassium hydroxide pellets. 3.2 Take about 300 g of the laboratory sample and, in the case of a solid product, grind it, i
6、f necessary, to ensure that the greatest dimension of the particles does not exceed about 6 mm. Place the sample in an airtight container made of a material which will not contaminate the sample with the elements to be determined, and which is of such a capacity that it is almost completely filled.
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- ISO 3195 1975
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