ISO-1118-1978.pdf
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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANOAADIZATION.MEXYHAPO,lHAR OPrAH3AUMR RO CTAHAAPTM3AUklM.ORGANlSATlON INTERNATIONALE DE NORMALISATION Aluminium and aluminium alloys - Determination of titanium - Spectrophotometric chromotropic acid method Aluminium et alliages d aluminium -
2、Dosage du titane - Mbhode spectrophotome trique B I acide chromotropique First edition - 1978-12-15 iii 2 UDC 669.71 : 543.42 : 546.821 Ref. No. IS0 1118-1978 (E) b CA Descripteurs : aluminium, aluminium alloys, chemical analysis, determination of content, titanium, spectrophotometric analysis. ts P
3、rice based on 6 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:09:02 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the Interna
4、tional Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been
5、set up has the right to 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 a
6、cceptance as International Standards by the IS0 Council. International Standard IS0 1118 was developed by Technical Committee ISOITC 79, Light metals and their alloys. It was submitted directly to the IS0 Council, in accordance with clause 6.13.1 of the Directives for the technical work of ISO. It c
7、ancels and replaces IS0 Recommendation R 1118-1969, which had been approved by the member bodies of the following countries : Belgium Canada Colombia Czechoslovakia Egypt, Arab Rep. of France Germany, F.R. Hungary India Iran Israel Italy Japan Korea, Rep. of Netherlands New Zealand Norway Poland Sou
8、th Africa, Rep. of Spain Sweden Switzerland Thailand Turkey United Kingdom U.S.A. U.S.S.R. No member body had expressed disapproval of the document. 0 International Organization for Standardization, 1978 l Printed in Switzerland Copyright International Organization for Standardization Provided by IH
9、S under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:09:02 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 1118-1978 (E) Aluminium and aluminium alloys - Determination of titanium - Spectrophotometr
10、ic chromotropic acid method 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a general method for the spectrophotometric determination of titanium in aluminium and aluminium alloys. The method is applicable to products having titanium contents between 0,005 and 0,3 % (m/m). How
11、ever, the method is not applicable completely to alloys having silicon contents greater than 1 % (m/m), for which it must be modified as indicated in the annex. 2 PRINCIPLE Attack of a test portion with sodium hydroxide, and acidification of the alkaline solution with nitric acid and sulphuric acid.
12、 Reduction of the iron( I I I) with ascorbic acid, and formation of the titanium-chromotropic acid complex at a chosen pH value between 2 and 2,50, controlled to within f 0,05 pH unit. Spectrophotometric measurement of the coloured complex at a wavelengh of about 470 nm. 3 REAGENTS During the analys
13、is, use only reagents of recognized analytical grade and distilled water or water of equivalent purity. 3.1 Sodium hydroxide, 200 g/l or approximately 5 N solution. In a nickel dish, dissolve 200g of sodium hydroxide in water. After cooling, make up the volume to 1 000 ml and mix. Immediately transf
14、er the solution to a plastic container. 3.2 Sodium hydroxide, 80 g/l or approximately 2 N solution. In a nickel dish, dissolve 80g of sodium hydroxide in water. After cooling, make up the volume to 1 000 ml and mix. 3.3 Nitric acid, p I,40 g/ml, approximately 15 N solution. 3.4 Sulphuric acid, p I,4
15、8 g/ml, approximately 18 N solution. Carefully add 500 ml of sulphuric acid, p I,84 g/ml, approximately 36 N solution, to approximately 400 ml of water. After cooling, make up the volume to 1 000 ml and mix. 3.5 Sulphuric acid, p I,21 g/ml, approximately 7 N solution. Carefully add 200 ml of sulphur
16、ic acid, p I,84 g/ml, approximately 36 N solution, to approximately 700 ml of water. After cooling, make up the volume to 1 000 ml and mix. 3.6 Sulphuric acid, p I,06 g/ml, approximately 2 N solution. Carefully add 60 ml of sulphuric acid, p I,84 g/ml, approxi- mately 36 N solution, to approximately
17、 500 ml of water. After cooling, make up the volume to 1 000 ml and mix. 3.7 Sulphurous acid (H,SO,), solution saturated at room temperature. 3.8 Sodium sulphite, 20 g/l solution. Dissolve 2 g of sodium sulphite (Na,SO,) in water and make up the volume to 100 ml. Prepare immediately before use. 1 Co
18、pyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 01:09:02 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1118-1978 E) 3.9 Potassium permanganate, 1 g/
19、l solution. Dissolve 0,l g of potassium permanganate in water and make up the volume to 100 ml. 3.10 Buffer solution, pH approximately 2,9. Dissolve 189 g of monochloroacetic acid (CH,CICOOH) in approximately 150 ml of water and add 40 g of sodium hydroxide previously dissolved in approximately 100
20、ml of water. Carefully mix and cool to room temperature. Filter, if necessary, through a medium texture filter paper and collect the filtrate in a 500 ml volumetric flask. Wash with water, make up to volume and mix. Use only a freshly prepared solution (one week maximum). 3.11 Ascorbic acid, 40 g/l
21、solution. Dissolve 1 g of ascorbic acid in 25 ml of water. Prepare immediately before use. 3.12 Chromotropic acid, 20 g/l solution. Dissolve 2 g of chromotropic acid (disodium salt of 1,8-dihydroxynaphthalene-3,6-disulphonic acid) in approxi- mately 70 ml of water containing 0,75 ml of glacial aceti
22、c acid, p 1,05 g/ml, approximately 18 N solution. Add 0,2 g of sodium metabisulphite (Na,S,O,) and shake until completely dissolved. Filter, if necessary, through a close texture filter paper and collect the filtrate in a 100 ml volumetric flask. Wash with water, make up to volume and mix. This solu
23、tion should have a very slight pale yellow colour and should be kept in a dark coloured container. It is stable for about three weeks. Do not use a dark coloured solution. 3.13 Mixed reagent, pH approximately 0,50. Place approximately 300 ml of water in a 1 000 ml volumetric flask, add 250,O ml of t
24、he sodium hydroxide solution (3.1), 100,O ml of the sulphuric acid solution (3.4) and 18,0 ml of the nitric acid solution (3.3) and mix. Cool, make up to volume and mix. 3.14 Titanium, standard solution corresponding to 0,5 g of Ti per litre. Prepare the solution according to one of the following me
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