1、BSI BSUb72L: PARTUS 89 m Lb24bb9 0397885 394 m BS 6721 : Part 9 : 1989 IS0 4749-1 984 UDC 669.3 669.45 : 543.42.062 . 543.41 : 620.1 (%, British Standards Institution. No mri of mis publication mav be Dhotoawied or otherwise renroduced without the prior permission in writing o BSI British Standard S
2、ampling and analysis of copper and copper alloys Part 9. Method for determination of lead in copper alloys by flame atomic absorption spectrophotometry IS0 title: Copper alloys - Determination of lead content - Flame atomic absorption spectrometric method1 Echantillonnage et analyse du cuivre et des
3、 alliages de cuivre Partie 9. Mthode de dosage du plomb par spectrophotomtrie dabsorption atomique dans la flamme dans les alliages de cuivre Kupfer und Kupferlegierungen; Probenahme und Analyse Teil 9. Flammenatomabsorptionsspektrometrisches Verfahren zur Bestimmung von Blei in Kupferlegieru ngen B
4、ritish Standards Institution BSI BS*b72L: PART*S 89 = Lb24bb9 0397886 220 = BS 6721 : Part 9 : 1989 Contents National foreword Committees responsible Method I. Scope and field of application 2. Principle 3. Reagents 4. Apparatus 5. Sampling Page inside front cover Back cover National foreword This P
5、art of BS 6721 has been prepared under the direction of the Non-ferrous Metals Standards Committee. BS 6721 is a multi-part standard and describes methods of sampling and analysis for copper and copper alloys. It is intended that Parts 1 to 3 of BS 6721 will describe methods of sampling copper and c
6、opper alloys in various forms. The remaining Parts will give methods for the determination of individual elements in copper and copper alloys. This Part of BS 6721 is identical with IS0 4749-1984 Copper alloys - Determination of lead content - Flame atomic absorption spectrometric method, published
7、by the International Organization for Standardization (ISO). 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 conventions are not identical with those used in Britis
8、h Standards; attention is drawn especially to the following. 6. Procedure 7. Expression of results 8. Test report Page 2 3 4 Tables 1. Lead content below 0,2 % (m/m) 2. Lead content between 0,l % and 1 X (mfm) 3. Lead content between 0,5 % and 5 % (mlm) 2 2 2 4. Dilution 3 The comma has been used as
9、 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 appear, referring to this standard, they should be read as Part of BS 6721. In British Standards it is current practice to use the symbo
10、l L for litre (and in its submultiples) rather than I. Additional information. To avoid possible confusion users of this Part of BS 6721 should note that the concentration designation c1 which is used in 7.1 to describe the concentration of lead in the lower bracketing solution, is also used in 7.2
11、to describe the concentration of lead in the blank solution. Compliance with a British Standard does not of itself confer immunity from legal obligations. ES1 BS*b72L: PART* 89 m Lb24bb9 0397887 Lb7 m BS 6721 : Part 9 : 1989 British Standard O Sampling and analysis of copper and copper alloys Part 9
12、. Method for determination of lead in copper alloys by flame atomic absorption spectrophotometry 1 Scope and field of application This International Standard specifies a flame atomic absorption spectrometric method for the determination of the lead content of all types of copper alloys listed in Int
13、ernational Standards. The method is applicable to the determination of lead as alloy- ing element or impurity between 0,Ol and 5.0 % rnlrnl. By appropriate modification of sample mass, the lower limit may be extended to 0,002 % (rnlrn). 2 Principle Dissolution of a test portion in fluoroboric-nitric
14、 acid mixture. Aspiration of the test solution into an air-acetylene flame, and determination of the lead content by spectrometric measure- ment of the absorption of the 217,O nm line emitted by a hollow-cathode lead lamp. O 3 Reagents During the analysis, use only reagents of recognized analytical
15、grade and only distilled water or water of equivalent purity. 3.1 Fluoroboric-nitric acid, attack reagent. Mix together 300 ml of boric acid, 40 g/l solution, 30 ml of the hydrofluoric acid, 40 % (V/ VI solution, 500 ml of the nitric acid, Q 1,N g/ml, and 150 ml of water. 3.2 Nitric acid, 1 + 1. Dil
16、ute 100 ml of nitric acid, e 1,40 g/ml, with 100 ml of water. 3.3 Copper, 20 g/l base solution. TransferlO.0 goflead-freecopper(roduced in any form without the prior permission in writing of BSI. This docs not preclude the free use, in the course of Date of issue Text affected BS6721 :Part9: IS0 474
17、9-1 984 1989 e imi)leriicntin the standard. of necessary details such as symbols and sire, tylx or grade designations. Enquiries should be addressed to the Publications Manager, BSI, Linford Wood, Milton Keynes klK14 6LE. The number for telephone enquiries is 0908 220022 and for telex 825777. Contra
18、ct requirements. 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. Revision of British Standards. British Standards are revised, when necessary, by the issue either of amendments or of
19、revised editions. It is important that users of British Standards should ascertain that they are in possession of the latest amendments or editions. Automatic updating service. BSI provides an economic, individual and automatic standards updating service called PLUS. Details are available from BSI E
20、nquiry Section at Milton Keynes, telephone 0908 221 166, telex 825777. Information on all BSI publications is in the BSI Catalogue, supplemented each month by BSI News which is available to subscribing members of BSI and gives details of new publications, revisions, amendments and withdrawn standard
21、s. Any person who, when making use of a British Standard, encounters an inaccuracy or ambiguity, is requested to notify BSI without delay in order that the matter may be investigated and appropriate action taken. Committees responsible for this British Standard The preparation of this British Standa
22、rd was entrusted by the Non-ferrous Metals Standards Committee (NFMI-1 to Technical Committee NFM/34 upon which the following bodies were represented: British Non-ferrous Metals Federation Copper Development Association London Metal Exchange Non-ferrous Metal Stockists Society of British Aerospace C
23、ompanies Limited Coopted members Amendm n s issued since publica The following bodies were also represented in the drafting of the standard, through subcommittees and panels: BNF Metals Technology Centre British Bronze and Brass Ingot Manufacturers Association Copper Smelters and Refiners Association Ministry of Defence National Brassfoundry Association Coopted members I I British Standards Institution 2 Park Street London W1A 2BS . Telephone 01-629 9000 - Telex 266933 8902 -3-1.3k-B N F M/34
