ISO-2865-1973.pdf
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1、L 1x0 2865 73 = 4853903 0107007 3 M - - - INTERNATIONAL STANDARD IS0 2865 : 1973 TECHNICAL CORRIGENDUM I - - - - Published 1991-07-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MWYHAPOflHAfl OPrAHM3ALlMfl no CTAHAAPTMSAUMH e ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium oxide primarily
2、 used for the production of aluminium - Determination of boron content - Cu rcu min spectrophotometric met hod TECHNICAL CORRIGENDUM 1 Oxyde daluminium principalement utilis pour la production de Ialuminium - Dosage du bore - Mthode spectrophotomtrique la curcurnine RECTIFICA TIF TECHNIQUE 1 Technic
3、al corrigendum 1 to International Standard IS0 2865 : 1973 was prepared by Technical Committee ISO/TC 47, Chemistry, Sub-Committee SC 7, Aluminium oxide, cryolite, aluminium fluoride, sodium fluoride, carbonaceous products for the aluminium industry. Page 1 Clause 2 Replace the reference to ISO/R 80
4、2 by a reference to IS0 802: 1976. Add the following reference : “IS0 2927: 1973, Aluminium oxide used primarily for the production of aluminium - Sampling.“ Page 2 Subclause 6.1 Replace the text of subclause 6.1 by the following text: “Weigh, to the nearest 0,001 g, 1 g of the laboratory sample, dr
5、ied at 300 O C , prepared as described in IS0 2927 and IS0 802 : 1976, subclause 3.3.“ UDC 661.862.22 : 546.27 : 543.42 Ref. No. IS02865 : 1973/Cor.l : 1991 (E) Descriptors : aluminium, aluminium oxide, chemical analysis, determination of content, boron, spectrometric method. o IS0 1991 Printed in S
6、witzerland 1 48517i3 0014779 1 2865-73 FOREWORD IS0 (the International 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 i
7、nterested in a subject for which a Technical Committee has been 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
8、 are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 2865 was drawn up by Technical Committee ISO/TC 47, Chemistry, and circulated to the Member Bodies in August 1972. It has been approved by the Member Bo
9、dies of the following countries : Austria Belgium Czechoslovakia Egypt, Arab Rep. of France Germany Hungary India Ireland South Africa, Reo. of Israel Sweden Italy Switzerland Mexico Thailand New Zealand Turkey Poland United Kingdom Portugal U.S.S.R. Roman i a The Member Body of the following countr
10、y expressed disapproval of the document on technical grounds : Ne the rla nds O International Organization for Standardization, 1973 0 Printed in Switzerland -. -,-,- INTERNATIONAL STAN DARD IS0 2865-1973 (E) Aluminium oxide primarily used for the production of aluminium - Determination of boron con
11、tent - Curcumin spectrophotometric method 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a clirciumin spectrophotometric method for the determination of the boron content of aluminium oxide primarily used for the production of aluminium. The method is applicable to boron cont
12、ents, expressed as boron oxide (B,O,), greater than 0,000 6 % (.e. 0,000 2 % expressed as boron (BI). NOTE - The sensitivity of the method, as may be gathered from the calibration curve, is in fact higher. In the case of a very low blank reading, and with sufficiently sensitive apparatus, the lower
13、limit of application of the method may be extended to 0,000 08 % of boron oxide (B-2031, corresponding to 0,000 025 %of boron (BI. 2 REFERENCE ISO/R 802, Aluminium oxide primarily used for the production of aluminium - Preparation and storage of test samples. 3 PRINCIPLE Dissolution of a test portio
14、n in phosphoric acid. Separation of the boron by distillation as methyl borate. Formation of a red-coloured complex between the boron and the curcumin reagent at pH 7. Spectrophotometric measurement of the complex at a wavelength of about 550 nm. .4 REAGENTS Distilled water, or water of equivalent p
15、urity, shall be used in the test. 4.1 Orthophosphoric acid, p approximately 1,70 g/ml, about 85 $ (mlm) solution. 4.2 Methanol, p approximately 0,79 g/mi. 4.3 Ethanol, p approximately 0,8 g/ml. 4.4 Glycerol, alkaline solution. Dissolve 1 g of sodium hydroxide and 0 , l g of sodium chloride in about
16、100 ml of water to which has been added 3 , O ml of glycerol. Store this solution in a silica flask. 4.5 Curcumin reagent solution. Add to a 250 ml silica one-mark volumetric flask : - 175 ml of the ethanol (4.3); - 3,75 g of oxalic acid (COOH),.2H20; . - 6,25 ml of hydrochloric acid solution, p app
17、roximately 1,19 g/ml, about 38 % (m/m) solution; - 19 ml of water; - 0,087 5 g of curcumin. Shake until completely dissolved, dilute to the mark with the ethanol (4.3) and mix. Store in the dark and at about 20 “C. This solution is stable for at least 2 months. 4.6 Boron, standard solution, correspo
18、nding to 0,08 g of B , O , per litre. Weigh, to the nearest 0,000 1 g, 0,142 1 g of boric acid (H,BO,). Transfer to a silica beaker of convenient capacity (for example 200 mi) and dissolve in water. Transfer the solution quantitatively to a 1 O00 ml silica one-mark volumetric flask, dilute to the ma
19、rk and mix. 1 ml of this standard solution corresponds to 0,08 mg of B2 03. 4.7 Boron, standard solution, corresponding to 0,000 8 g of B , O , per litre. Place 10,O ml of the standard boron solution (4.6) in a 1 O00 ml silica one-mark volumetric flask, dilute to the mark and mix. 1 IS0 2865-1973 (E
20、) 1 ml of this standard solution corresponds to 0,8pg of B23- Prepare this solution just before use. 4.8 Thymol blue solution, 0,5 g/I. Dissolve 0.05g of thymol blue in water and dilute to 100 ml. 5 APPARATUS Ordinary laboratory apparatus and : 5.1 Silica apparatus, for the boron distillation. The a
21、pparatus (an example of which is shown in Figures 1 and 2) comprises : 5.1.1 Distillation flask, 250 ml with a ground neck; NOTE - The flask shall be replaced as soon as it shows signs of attack by phosphoric acid. 5.1.2 Guard tube, bent and fitted with ground joints; 5.1.3 Adaptor, with three groun
22、d joints; 5.1.4 Cylindrical dropping funnel, with ground joint and stopper; 5.1.5 Connector, with two ground joints; 5.1.6 Liebig condenser, with ground joints (effective length, about 400 mm). NOTE - Use different apparatus for the distillation of : - the blank test; - test portions of 8203 content
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