1、BRITISH STANDARD BS 4522:1988 ISO 758:1976 Method for Determination of absolute density at20 C of liquid chemical products for industrial use ISO title: Liquid chemical products for industrial use Determination of density at 20 C UDC 531.756.1:542.3BS4522:1988 This British Standard, having been prep
2、ared under the directionof the Chemicals Standards Committee, was published under the authority ofthe Board of BSI and comesintoeffect on 30December1988 BSI 12-1999 First published January 1970 First revision December 1988 The following BSI references relate to the work on this standard: Committee r
3、eference CIC/54 Draft (ref. 87/56117) announced in BSI News February 1988 ISBN 0 580 16930 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC/54, upon which the following bo
4、dies were represented: Chemical Industries Association Ministry of Defence Coopted members Amendments issued since publication Amd. No. Date of issue CommentsBS4522:1988 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 Re
5、ference 1 3 Definition 1 4 Principle 1 5 Apparatus 1 6 Procedure 1 7 Expression of results 1 8 Test report 1 Figure 50 ml pyknometer flask, type 3 (Gay-Lussac) 2 Publications referred to Inside back coverBS4522:1988 ii BSI 12-1999 National foreword This British Standard has been prepared under the d
6、irection of the Chemicals Standards Committee. It is identical with ISO758:1976 “Liquid chemical products for industrial use Determination of density at20 C”, prepared by Technical Committee ISO/TC47, Chemistry, of the International Organization for Standardization (ISO). The principal difference be
7、tween this standard and the1970 edition is that the text is more complete and has been brought up to date. 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 conventio
8、ns 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. The symbol “ml” has been used for millilitre.
9、 In British Standards it is current practice to use the symbol “mL”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. Additional information. With reference to clause6, water complying with grade3 of BS3978 “Specification for
10、water for laboratory use” is suitable. Attention is drawn to the related British Standard BS4699:1985 “Methods for determination of density or relative density of petroleum and petroleum products (pyknometer methods)”, which is identical with ISO3838:1983 “Crude petroleum and liquid or solid petrole
11、um products Determination of density or relative density Capillary-stoppered pyknometer and graduated bicapillary pyknometer methods”. BS4699 provides for the determination of density at various temperatures and for more precise values; precision data are included. NOTETextual error. In the footnote
12、 to clause7, “atmopheric” should be read as “atmospheric”. This standard describes a method of test only and should not be used or quoted as a specification defining limits of purity. Reference to this standard should indicate that the method of test used is in accordance with BS4522:1988. A British
13、 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 from legal obligations. Cross-reference International Standard Correspondi
14、ng British Standard ISO 3507:1976 BS 733 Pyknometers Part 1:1983 Specification (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 standard has been updated (see copyright date) and may h
15、ave had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4522:1988 BSI 12-1999 1 1 Scope and field of application This International Standard specifies a reference method for the determination of the density, at20 C, of liquid chemical products for i
16、ndustrial use. 2 Reference ISO 3507, Pyknometers. 3 Definition density at20 C of a material the mass of unit volume of the material at20 C. It is expressed in grams per millilitre 4 Principle Determination of the mass at20 C of a volume of the material contained in a pyknometer flask, and determinat
17、ion of the volume of the latter by determining the mass of a corresponding volume of water at20 C. Calculation of the density by dividing the mass of the material by the capacity of the flask. 5 Apparatus Ordinary laboratory apparatus, and 5.1 Pyknometer flask, type 3 (Gay-Lussac) (see ISO3507), mad
18、e of glass and of a size and type suitable for use with the material under test, preferably25or50ml (see theFigure). 5.2 Water bath, capable of being controlled at20 0,1 C. 6 Procedure 6.1 Clean and dry the flask (5.1) and weigh it, with its stopper, to the nearest0,001g. Fill the flask with freshly
19、 boiled and cooled distilled water, and determine the apparent mass of the contents, previously brought to20 0,1 C in the water bath(5.2). 6.2 Empty, clean and dry the flask, fill it with the sample under test, and determine in a similar manner the apparent mass of sample contained in the flask at20
20、 C. NOTEWith volatile liquids, it is essential that suitable precautions be taken to avoid loss by evaporation. 7 Expression of results The density of the sample at20 C, in grams per millilitre, is given by the formula where m 1 is the apparent mass, in grams, of sample required to fill the flask at
21、20 C; m 2 is the apparent mass, in grams, of water required to fill the flask at20 C; is the density of water at20C=0,9982g/ml; A is the buoyancy correction = a m 2 , where ais the density of air . 0,0012g/ml. 1) Calculate the result to three decimal places. 8 Test report The test report shall inclu
22、de the following particulars: a) the reference of the method used; b) the results and the method of expression used; c) any unusual features noted during the determination; d) any operation not included in this International Standard or in the International Standard to which reference is made, or re
23、garded as optional. 1) This Figure varies slightly with atmopheric conditions, but normal variations will have a negligible effect on density determinations.BS4522:1988 2 BSI 12-1999 Figure 50 ml pyknometer flask, type 3 (Gay-Lussac)BS4522:1988 BSI 12-1999 Publications referred to See national forew
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