1、BRITISH STANDARD BS 4524:1983 ISO 759:1981 Method for Determination of residue on evaporation on a water bath ISO title: Volatile organic liquids for industrial use Determination of dry residue after evaporation on a water bath General method UDC 661.7-404:543.814BS4524:1983 This British Standard, h
2、aving been prepared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 31 May 1983 BSI 07-1999 First published January 1970 First revision May 1983 The following BSI references relate to the work on this standard: Com
3、mittee reference CIC/4 Draft for comment 80/50588 DC ISBN 0 580 11963 7 Committees responsible for this British Standard This British Standard was published under the direction of the Chemicals Standards Committee CIC/-. Its preparation was entrusted to Technical Committee CIC/4 upon which the follo
4、wing bodies were represented: Chemical Industries Association Ministry of Defence Oil and Colour Chemists Association Royal Society of Chemistry Society of Chemical Industry Coopted member Amendments issued since publication Amd. No. Date of issue CommentsBS4524:1983 BSI 07-1999 i Contents Page Comm
5、ittees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Sampling 1 6 Procedure 1 7 Expression of results 1 8 Test report 2 Publications referred to Inside back coverBS4524:1983 ii BSI 07-1999 National foreword This Br
6、itish Standard, prepared under the direction of the Chemicals Standards Committee, is a revision of BS 4524:1970 and is identical with ISO759:1981“Volatile organic products for industrial use Determination of dry residue after evaporation on a water bath General method”, published by the Internation
7、al Organization for Standardization (ISO). ISO 759:1981 is a revision of ISO Recommendation R 759:1968 with which BS 4524:1970 was technically equivalent. The standard has been revised primarily to make it generally applicable to volatile organic materials. Additional experimental details have been
8、included to ensure uniformity of interpretation. This standard supersedes BS 4524:1970, which is withdrawn. Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventi
9、ons are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard”
10、appear, referring to this standard, they should be read as “British Standard”. Cross-references ISO 5277, referred to in clause 1, has been disapproved by the United Kingdom on technical grounds. This in no way affects the acceptability of ISO 759 since the reference is given purely for information.
11、 Additional information. With reference to clause 5, additional guidance on sampling is given in BS 5309 “Methods for sampling chemical products” Part1: “Introduction and general principles” and Part 3: “Sampling of liquids”. This standard describes a method of test only and should not be referred t
12、o as a specification defining limits of purity. Reference to the standard should indicate that the method of test used is in accordance with BS4524. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
13、 application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International standard Corresponding British Standard ISO 758:1976 BS 4522:1970 Method for the determination of density of liquids at 20 C (Technically equivalent) ISO 5789:1979 BS 5598 Method
14、s of sampling and test for halogenated hydrocarbons Part 8:1980 Determination of non-volatile residue in fluorinated hydrocarbons (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This stand
15、ard 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.BS4524:1983 BSI 07-1999 1 1 Scope and field of application This International Standard specifies a general method for the determination of the d
16、ry residue, after evaporation on a water bath, of volatile organic liquids for industrial use. The method is applicable to products having dry residues after evaporation greater than or equal to10 mg/kg 0,001% (m/m). NOTE 1For the determination of the non-volatile residue of fluorinated hydrocarbons
17、 for industrial use, see ISO 5789. NOTE 2For the determination of the residue on evaporation of aromatic hydrocarbons, or other toxic volatile materials, having residues on evaporation of not less than 1 mg/100 ml, seeISO5277. 2 References ISO 758, Liquid chemical products for industrial use Determi
18、nation of density at 20 C. ISO 5277, Aromatic hydrocarbons Determination of residue on evaporation 1) . ISO 5789, Fluorinated hydrocarbons for industrial use Determination of non-volatile residue. 3 Principle Evaporation of a test portion on a water bath, and drying of the residue, if any, in an ove
19、n at110 2 C to constant mass. 4 Apparatus Ordinary laboratory apparatus, and 4.1 Dish, of platinum, silica or borosilicate glass, of capacity about 150 ml. 4.2 Water bath, maintained at a temperature appropriate to the boiling point of the product under examination. WARNING The heating system shall
20、be designed so as to avoid all possibility of a fire hazard. 4.3 Electric oven, capable of being maintained at110 2 C. 5 Sampling 2) Procedures for sampling and sample preparation which are specific to a particular product being examined will be specified in the appropriate product standard. Store t
21、he laboratory sample in a clean, dry, ground glass stoppered glass container of such capacity that it will be almost entirely filled by the sample. If it is necessary to seal the container, take care to avoid any risk of contamination of the laboratory sample. 6 Procedure 6.1 Test portion Take 100 0
22、,1 ml of the test sample. 6.2 Determination Introduce the test portion (6.1) into the dish (4.1) previously heated for 2 h in the oven (4.3) at110 2 C, cooled in a desiccator and weighed to the nearest 0,000 1 g. Place the dish and its contents on the water bath(4.2) maintained at the appropriate te
23、mperature and, operating in a well-ventilated fume cupboard, evaporate to dryness. Remove the dish from the water bath, wipe the outside with a tissue and continue heating in the oven (4.3), maintained at 110 2 C, for about 2 h. Remove the dish from the oven, allow it to cool to ambient temperature
24、in a desiccator and weigh to the nearest 0,000 1 g. Repeat the operations of heating, cooling and weighing until constant mass is attained, i.e. until the difference between two consecutive weighings does not exceed 0,000 2 g. If the mass of the residue is less than 0,001 g, add a further 100 0,1 ml
25、 of the test sample to the same dish and repeat the determination, taking this into account in the calculation of results. 7 Expression of results The dry residue obtained from the aliquot portion taken for the determination, expressed in grams, is given by the formula m 1 m 0 where The results, in
26、terms of dry residue content, may be expressed in one of the following ways: in milligrams per litre (mg/l), or in milligrams per kilogram (mg/kg), or as a percentage by mass %(m/m), or in milligrams per 100 ml (mg/100ml). If the product under examination is covered by an International Standard, the
27、 method of expression specified in the International Standard shall be adopted. In other cases, the method of expression shall be agreed between the interested parties. 1) At present at the stage of draft. 2) The sampling of liquid chemical products for industrial use will form the subject of a futu
28、re International Standard. m 0 is the mass, in grams, of the empty dish(4.1); m 1 is the mass, in grams, of the dish plus residue.BS4524:1983 2 BSI 07-1999 The value of density used to calculate the results in milligrams per kilogram or as a percentage by mass shall be that determined by the method
29、specified in ISO 758. 8 Test report The test report shall include the following particulars: a) an identification of the sample; b) the reference of the method used; c) the results and the method of expression used; d) any unusual features noted during the determination; e) any operation not include
30、d in this International Standard or in the International Standards to which reference is made, or regarded as optional.BS4524:1983 BSI 07-1999 Publications referred to See national foreword.BS 4524:1983 ISO759:1981 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the in
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