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1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIATIONOMEXLIYHAPOLHAR oprAkw3Aw7 TAHAPTAHANISATION INTERNATIONALE 0 NORMALISATION Aluminium and aluminium alloys - Determination of titanium content - Diantipyrylmethane photometric method Aluminium et alliages d aluminium - Dosage du tit
2、ane - Mkthode photomktrique au diantipyrylmkthane First edition - 1981-02-01 ci UDC 889.71 : 543.42 : 548.821 Ref. No. IS0 8827-1981 (E) i% Descriptors : aluminium, aluminium alloys, chemical analysis, determination of content, titanium, spectrophotometric analysis. ii G Price based on 3 pages , Cop
3、yright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:39:50 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for S
4、tandardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to
5、 be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as Internatio
6、nal Standards by the IS0 Council. International Standard IS0 6927 was developed by Technical Committee ISO/TC 79, Light metals and their alloys, and was circulated to the member bodies in November 1979. It has been approved by the member bodies of the following countries : Australia India Austria Ja
7、pan China Korea, Rep. of Czechoslovakia Mexico Egypt, Arab Rep. of Norway France Poland Germany, F. R. Portugal Hungary Romania South Africa, Rep. of Spain Sweden Switzerland United Kingdom USSR Yugoslavia The member body of the following country expressed disapproval of the document on technical gr
8、ounds : Netherlands 0 International Organization for Standardization, 1981 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:39:50 MDTNo reproduction or
9、 networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 6827-1981 (E) Aluminium and aluminium alloys - Determination of titanium content - Diantipyrylmethane photometric method 1 Scope and field of application This international Standard specifies a diantipyrylmethane photome
10、tric method for the determination of the titanium content of aluminium and aluminium alloys. The method is applicable to products having titanium contents between 0,003 and 0,3 % (m/m). 2 Principle Dissolution of a test portion in hydrochloric acid, reduction of the ironfIll) and vanadium(V) interfe
11、rences by the addition of ascorbic acid in the presence of copper sulphate, and addi- tion of diantipyrylmethane to form the yellow titanium com- plex. Photometric measurement of the complex at a wavelength of about 400 nm. 3 Reagents During the analysis, use only reagents of recognized analytical g
12、rade and only distilled or deionized water. 3.1 Hydrochloric acid, Q approximately 1,l g/ml, about 20 % (m/m) or approximately 6 mol/l solution. Dilute 500 ml of hydrochloric acid, Q approximately I,19 g/ml, 36 % (m/m) or approximately 12 mol/l solution, with 500 ml of water. 3.2 Sulphuric acid, Q a
13、pproximately I,84 g/ml, 96 % (m/m) or approximately 18 mol/l solution. 3.3 Sulphuric acid, Q approximately I,46 g/ml, 56 % (m/m) or approximately 9 mol/l solution. While stirring and cooling, add 50 ml of the sulphuric acid solution (3.2) to 40 ml of water. Cool again, then dilute to 100 ml and mix.
14、 3.4 Nitric acid, ,Q approximately I,40 g/ml, 66 % (m/m) or approximately 15 mol/l solution. 3.5 Hydrogen peroxide, approximately 30 % (m/m) solution. 3.6 Hydrofluoric acid, Q approximately 1,13 g/ml, approximately 40 % (m/m) solution. 3.7 Potassium permanganate. 1 g/l solution. Dissolve 1 g of pota
15、ssium permanganate (KMnO,) in water, dilute to 1 000 ml and mix. 3.6 Copper sulphate, 50 g/j solution. Dissolve 5 g of anhydrous copper sulphate (CuS04) in water, dilute to 100 ml and mix. 3.6 Ascorbic acid, 20 g/l solution. Prepare just before use. Dissolve 2 g of ascorbic acid (CsHsOs) in water, d
16、ilute to 100 ml and mix. 3.10 Diantipyrylmethane, 50 g/l solution in approximately 0.1 mol/l hydrochloric acid solution. Dissolve 5 g of diantipyrylmethane in approximately 17 ml of the hydrochloric acid solution (3.1) and 70 ml of water, dilute to 100 ml with water and mix. 3.11 Aluminium, 10 g/l s
17、olution. Weigh, to the nearest 0,Ol g, 10 g of previously pickled aluminium (purity 9999 %) free from titanium, transfer it to a 1 000 ml beaker and cover with a watch glass. Add, in small portions, 300 ml of the hydrochloric acid solution (3.1) and, if necessary, a drop of metallic mercury to assis
18、t the attack. If necessary, warm gently to help dissolution, then add a few drops of the hydrogen peroxide solution (3.5) and boil for a few minutes to remove the excess of hydrogen peroxide. Dilute to about 500 ml with water. After cooling, transfer the solution quantitatively to a 1 000 ml one-mar
19、k volumetric flask, dilute to the mark and mix. 50 ml of this solution contain 0,5 g of aluminium. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:39:50 MDTNo reproduction o
20、r networking permitted without license from IHS -,-,- IS0 6827-1981 (E) 3.12 Titanium, standard solution corresponding to 0,5 g of titanium per litre. Prepare this standard solution by one of the following methods. 3.12.1 Weigh, to the nearest 1 mg, 0.5 g of pure titanium (purity 99,5 %I and transfe
21、r it to a 800 ml beaker. Dissolve it in 125 ml of the sulphuric acid solution (3.2) and oxidize with a few drops of the nitric acid (3.4). Boil the solution gently until all nitric acid fumes have been given off. Cool, dilute suitably, transfer to a 1 000 ml one-mark volumetric flask, dilute to the
22、mark with water and mix. 1 ml of this standard solution contains 0,5 mg of titanium. 3.12.2 Weigh, to the nearest 0,l mg, 1,848 5 g of potassium titanyl oxalate dihydrate K2TiO(Cz04)2.2H201 and transfer to a 100 ml Kjeldahl flask. Add I,8 g of ammonium sulphate (NH ml is the mass, in milligrams, of
23、titanium found in the aliquot portion of the test solution (6.3.2) measured against the reference solution (6.3.3); D is the ratio of the volume of the test solution to that of the aliquot portion taken for the colour reaction. 8 Notes on procedure 8.1 Instead of 3 ml of the hydrogen peroxide soluti
24、on (3.5), 1 ml of the nitric acid solution (3.4) may be used to oxidize the test solution. 8.2 For alloys with relatively high zinc contents, some precipitate may occur in the solution. In this case, filter part of the solution into a dry container before making photometric measurements. 8.3 The cor
25、responding value of absorbance of this “basic” colour should be deducted from the measured absorbance of the test solution in order to avoid interference from elements which form coloured ions in the solution. 9 Test report The test report shall include the following particulars : a) identification
26、of the test sample; b) the reference of the method used; c) the results and the method of expression used; d) any special features noted during the determination; e) any operations not specified in this International Stan- dard, or regarded as optional. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 07:39:50 MDTNo reproduction or networking permitted without license from IHS -,-,-