1、BRITISH STANDARD BS 6075-14: 1981 Methods of Sampling and test for sodium hydroxide for industrial use Part 14: Determination of matter insoluble in water NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction”, published separately asBS6075-0.
2、UDC661.322.1:546.33 36:543.721BS6075-14:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authorityofthe Executive Boardand comes into effect on 27 February1981 BSI 11-1999 The following BSI reference relates to the work
3、 on this standard: Committee reference CIC/22 ISBN0 580 12064 3 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity f
4、rom legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendmen
5、t table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS6075-14:1981 BSI 11-1999 i Contents Page 1 Scope 1 2 References 1 3 Principle 1 4 Reagents 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 1 Publications referred to Inside back coverii blan
6、kBS6075-14:1981 BSI 11-1999 1 1 Scope This British Standard describes a method of test for the determination of matter insoluble in water for sodium hydroxide for industrial use. There is no corresponding International Standard for this method. 2 References The titles of the publications referred to
7、 in this standard are listed on the inside back cover. 3 Principle A solution of the test portion is filtered through a tared filter crucible and the mass of the water-insoluble residue is determined. 4 Reagents Water complying with the requirements ofBS3978 shall be used throughout. 5 Apparatus Ord
8、inary laboratory apparatus and the following are required. 5.1 Oven, capable of being controlled within the temperature range100 C to105 C. 5.2 Crucible, sintered glass or porous porcelain, of porosity grade no.4, complying with the requirements ofBS1752. Use a crucible for the determination which h
9、as been pre-treated as follows. Filter200ml of approximately100g/l sodium hydroxide solution slowly through the crucible. Rinse thoroughly with water to ensure that any loose particles and all the residual sodium hydroxide solution is removed. Dry in the oven(5.1), controlled within the temperature
10、range100 C to105 C, for1h and allow to cool in a desiccator. NOTEThe crucible may be used for subsequent determinations without further pretreatment. 6 Procedure 6.1 Test portion. Weigh, to the nearest0.1g in a plastics weighing bottle fitted with a cover,50g of the sample. 6.2 Determination. Transf
11、er the test portion(6.1) to a400ml beaker and add about250ml of water. When dissolution of the test portion is complete, allow the solution to cool to room temperature and then filter it through the clean dry crucible(5.2) previously weighed to the nearest0.1mg, transferring any insoluble matter int
12、o the crucible with a jet of water. Wash the crucible five times with5ml portions of water at room temperature. Dry the crucible and contents for1h in the oven(5.1), controlled at100 C to105 C, allow it to cool in a desiccator and weigh it to the nearest0.1mg. 7 Expression of results The matter inso
13、luble in water, expressed as a percentage by mass, is given by the formula: where m 0 is the mass of the test portion (ing) m 1 is the mass of the matter insoluble in water (ing). m 1 100 m 0 -2 blankBS6075-14:1981 BSI 11-1999 Publications referred to BS 1752, Laboratory sintered or fritted filters.
14、 BS 3978, Water for laboratory use. BS 6075-14: 1981 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorpora
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