1、BRITISH STANDARD BS6075-5: 1981 ISO3195:1975 Methods of Sampling and test for sodium hydroxide for industrial use Part 5: Sampling and preparation of main test solution ISO title: Sodium hydroxide for industrial use Sampling Test sample Preparation of the main solution for carrying out certain deter
2、minations NOTEIt is recommended that this Part be read in conjunction with the information in the “General introduction” published separately asBS6075-0. UDC 661.322.1:546.33 36:543.05BS6075-5:1981 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, w
3、as published under the authorityofthe Executive Boardand comes into effect on 27 February1981 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference CIC/22 Draft for comment73/54863 DC ISBN 0 580 12055 4 Amendments issued since publication Amd. No. Date of
4、issue CommentsBS6075-5:1981 BSI 11-1999 i Contents Page National foreword ii 1 Scope and field of application 1 2 Laboratory sample 1 3 Test sample 1 4 Preparation of the main solution for carrying out certain determinations (solution A) 1BS6075-5:1981 ii BSI 11-1999 National foreword This Part ofBS
5、6075 is identical withISO3195 “Sodium hydroxide for industrial use Sampling Test sample Preparation of the main solution for carrying out certain determinations”, published in1975 by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International
6、Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In
7、British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. A British Standard does not purport to include all the necessary provisions o
8、f a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, page1 and a back cover. T
9、his standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6075-5:1981 BSI 11-1999 1 1 Scope and field of application This International Standard gives instructions relating to the sampling of
10、 consignments of sodium hydroxide, indicates the conditions under which the test sample shall be prepared, and specifies a method for the preparation of the main solution which will be used for carrying out certain determinations. 2 Laboratory sample 2.1 The properties of sodium hydroxide make parti
11、cular precautions essential: its hygroscopic characteristics, its ability to absorb carbondioxide and its corrosive action on containers. These properties make it necessary that: samples shall be taken rapidly in a dry atmosphere; the laboratory sample shall be stored in an airtight bottle, protecte
12、d 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 material such as polyethylene, if the determination of silica content is intended). 2.2 For the methods of sampling, and the
13、 number of portions to be drawn from a given quantity, seeISO. 1) 3 Test sample 3.1 The laboratory sample shall be protected from the atmosphere and handled in such a way that no appreciable absorption of water or carbondioxide is possible during the operations. Crushing or grinding in a mortar, if
14、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 which moisture and carbon dioxide have been removed by the introduction, at least1h before the sample is treated, of flat dish
15、es, one containing phosphorus(V) oxide and another potassium hydroxide pellets. 3.2 Take about300g of the laboratory sample and, in the case of a solid product, grind it, if necessary, to ensure that the greatest dimension of the particles does not exceed about6mm. Place the sample in an airtight co
16、ntainer 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. The container shall bear a label, with a protective coating, indicating: the origin and identification of the test sample; the dat
17、e on which it was placed in the container. 4 Preparation of the main solution for carrying out certain determinations (solution A) 4.1 Test portion In a glass weighing bottle fitted with a ground lid, weigh, to the nearest0,01g, a mass of the solid or liquid test sample corresponding to a little les
18、s than40g ofNaOH. 4.2 Reagent Distilled carbonate-free water, or water of equivalent purity, shall be used. 4.3 Procedure Preparation of the main solution (A) 4.3.1 Solid Products Dissolve the test portion(4.1) in about200ml of water. Cool to room temperature and transfer the solution quantitatively
19、 to a1000ml one-mark volumetric flask, dilute almost to the mark, cool again to room temperature, complete the dilution to the mark, and mix. 4.3.2 Liquid products Transfer the test portion(4.1) directly and quantitatively to a1000ml one-mark volumetric flask, dilute almost to the mark, cool again t
20、o room temperature, complete the dilution to the mark and mix. NOTEIf the silica content is to be determined, dissolve the test portion in a container made of silica-free material (for example, polyethylene or silver). In the case of a polyethylene container, cool the outer walls with running water
21、in order to prevent softening. After the dilution to the mark in a1000ml one-mark volumetric flask, transfer the solution to a dry polyethylene bottle with an airtight closure. 1) In preparation.BS6075-5: 1981 ISO 3195:1975 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI
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