BS 1748-Parts 11 and 12-1964.pdf
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1、BRITISH STANDARD BS 1748: Parts 11 and 12:1964 Methods for The determination of copper and lead in leaded bronze alloys Methods for the analysis of copper alloys Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1748: Parts 11 and 12:1964 T
2、his British Standard, having been approved by the Non-ferrous Metals Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 13 February 1964 BSI 09-1999 The following BSI references relate to the wo
3、rk on this standard: Committee reference NFE/-/2 Draft for comment D63/1026 ISBN 0 580 01839 3 Co-operating organizations The Non-ferrous Metals Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departm
4、ents and scientific and industrial organizations: Admiralty*Institution of Mechanical Engineers Aluminium Federation(Automobile Division) Association of Bronze and Brass Founders*Institution of Mining and Metallurgy Association of Consulting EngineersInstitution of Structural Engineers (Incorporated
5、)Lead Development Association British Bronze and Brass Ingot ManufacturersLight Metal Founders Association Association*London Metal Exchange British Electrical and Allied ManufacturersMagnesium Industry Council AssociationMinistry of Aviation British Lead Manufacturers AssociationMinistry of Transpo
6、rt British Non-ferrous Metals FederationNational Brassfoundry Association British Non-ferrous Metals ResearchNon-ferrous Metal Stockists Association*Post Office Copper Development AssociationRoyal Institute of British Architects Crown Agents for Oversea Governments andSociety of British Aircraft Con
7、structors AdministrationsSociety of Motor Manufacturers and Traders Electric Cable Makers FederationLtd. High Commission of IndiaTin Research Institute High Conductivity Copper AssociationWar Office* Institute of British FoundrymenZinc Development Association Institute of MetalsIndividual manufactur
8、ers The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: D.S.I.R. Laboratory of the Government Chemist Individ
9、ual analysts Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1748: Parts 11 and 12:1964 BSI 09-1999i Contents Page Co-operating organizationsInside front cover Forewordii Part 11. D
10、etermination of copper1 Part 12. Determination of lead3 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1748: Parts 11 and 12:1964 ii BSI 09-1999 Foreword This standard makers reference to the following British Standard: BS 1499, Sampling
11、 non-ferrous metals. These methods for the determination of copper and lead form part of a series of methods for the analysis of copper alloys, which will form a complete British Standard issued in several parts. The methods are intended primarily for the analysis of the copper alloys included in BS
12、 1400, “Schedule of copper alloy ingots and copper and copper alloy castings”, and those included in the series of schedules of wrought copper and copper alloys BS 2870BS 2875. Parts 1 and 2 already published for the determination of copper and lead in copper alloys were found to be unsuitable for t
13、he analysis of alloys with high lead content and modifications have therefore been introduced into these two parts. Parts 3, 4 and 5 for the determination of iron, aluminium and nickel are applicable without any modification, to the analysis at these high lead alloys. The methods have been found to
14、give reliable and reproducible results, and while in some instances they may appear to be lengthy, it should be realized that they are put forward as referee methods to be used in cases of dispute. A British Standard does not purport to include all the necessary provisions of a contract. Users of Br
15、itish 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, pages i and ii, pages 1 to 4 and a back cover. This standard has
16、 been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:09:52 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1748: Parts 11 and 12:1964 BSI 09-19991
17、Part 11. Determination of copper Introduction a) Principle. The sample is dissolved in bromine-hydrobromic acid, tin is volatilized and bromides are decomposed with nitric acid. Copper and lead are separated by electrolytic deposition from independent aliquots using the appropriate nitric acid conce
18、ntration for each. The copper content is calculated from the increase in weight of the cathode; any trace amount of copper in the electrolyte is subsequently determined photometrically. b) Range. 70 to 90 per cent copper. c) Reproducibility. Experiments have been carried out independently by a numbe
19、r of analysts using the method recommended in this standard on samples specially selected for their homogeneity. Provided the sample is homogeneous the degree of reproducibility that can be expected is shown by the following analysis of the results obtained. d) Application. This method is applicable
20、 to copper alloys containing lead in the range 725 per cent. For alloys having a lower lead content Part 1 is applicable. Apparatus All glassware should be washed with hydrochloric acid (50 per cent v/v) and then rinsed with distilled water. a) Class A volumetric glassware complying with the appropr
21、iate British Standard shall be used throughout. b) Platinum gauze electrodes, sand-blasted, of stationary type and of conventional size (about 1 dm2 surface area): the diameter and height of the outer should be about 1# in (44.5 mm) and the diameter and height of the inner should be about 1! in (32
22、mm). c) Any instrument suitable for measuring the optical density of the solution at a wavelength of 595 m may be used together with 4 cm cells. Alternatively when a filter photometer of the balanced two-cell type is used, the following conditions have been found suitable: Calorex H503 with Ilford 6
23、06 or equivalent filters Solutions required All reagents shall be of the highest purity obtainable, and distilled water shall be used throughout. Solutions shall be freshly prepared and where necessary, filtered. Where aluminium is subsequently to be determined in the electrolyte, double-distilled w
24、ater shall be used. Standard copper (1 ml N 0.004 mg of copper). Dissolve 0.1572 g of copper sulphate (CuSO4.5H2O) in water. Transfer to a 1 litre volumetric flask, dilute to the mark and mix. Transfer 100 ml of this solution to a second 1 litre volumetric flask, dilute to the mark and mix. Bromine-
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