ISO-5400-1984.pdf
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1、International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.MEIKAYHAPOAHAR OPTAHM3AlJMR f-IO CTAHAAPTkl3ALW4ORGANlSATlON INTERNATIONALE DE NORMALISATION Leather - Determination of total silicon content - Reduced molybdosilicate spectrometric method Cuir - Dbtermina tion de la teneur en sil
2、icium total - Mthode spectromktrique au molybdosilicate rkduit First edition - 1984-03-01 UDC 675: 543.849 Ref. No. IS0 54004984 (E) Descriptors : leather, tanning, tests, determination of content, silicon, spectrophotometric analysis. Price based on 2 pages Copyright International Organization for
3、Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 19:53:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization) is a worldwide federat
4、ion of national standards bodies (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 authorized has the right to be represented on that committee. Inter
5、national 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 International Standards by the IS0 Council. Intern
6、ational Standard IS0 5400 was developed by Technical Committee ISO/TC 120, Leather, and was circulated to the member bodies in May 1981. It has been approved by the member bodies of the following countries : Brazil Kenya China Korea, Rep. of Egypt, Arab Rep. of Mexico Ethiopia New Zealand Germany, F
7、. R. Romania Hungary South Africa, Rep. of India Spain Sri Lanka Tanzania Turkey United Kingdom USSR The member body technical gro unds 0 of the following country expressed disapproval of the document on France International Organization for Standardization, 1984 Printed in Switzerland Copyright Int
8、ernational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 19:53:36 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 5400-1984 (E) Leather - Determina
9、tion of total silicon content - Reduced molybdosilicate spectrometric method 1 Scope and field of application This International Standard specifies a reduced molybdosilicate spectrometric method for the determination of the total silicon content of leather. It is not possible to define the chemical
10、identity of the silicon compounds present in leather and the results are expressed in terms of the oxide Si02. Organo-silanes are present in leather and they may be determined by this procedure. Organo-silanes are almost quantitatively extracted from leather by tetra- hydrofuran or dichloromethane,
11、and this forms the basis of a method for their determination (Elliott, JSLTC, 1964, 48, 105; SLTC-Method SLCI16). A more reliable estimate of inorganic silicon-containing compounds will therefore be obtained if leathers suspected of containing organo-silanes are first extracted with dichloromethane.
12、 4.2 Sulfuric acid, standard solution, cW2 HZS04) = 1,0 mol/l. 4.3 Glycerol. 4.4 Sodium sulfate, 100 g/l solution. 4.5 Ammonium molybdate, 100 g/l solution containing 2 ml of ammonium hydroxide, ,020 = 0,880 g/ml, per 100 ml of solution. 4.6 Tin(ll) chloride, dihydrate, 10 g/l solution, Dissolve IO
13、g of SnC12.2H20 in 12 ml of warm hydrochloric acid, e20 = 1,19 g/ml and 5 ml water, then dilute to 1 000 ml. Prepare this solution fresh. 2 References 4.7 Fusion mixture, consisting of IS0 835, Laboratory glassware - Graduated pipettes - Part I : General requirements. Part 2 : Pipettes for which no
14、waiting time is specified. IS0 1042, Laboratory glassware - One-mark volumetric flasks. IS0 2418, Leather - Laboratory samples - Location and iden- tifica tion. IS0 2588, Leather - Sampling - Number of items for a gross sample. 100 g of sodium peroxide; 10 g of potassium nitrate; 3 g of powdered suc
15、rose. 5 Apparatus Ordinary laboratory apparatus and 5.1 Parr bomb, 22 ml. IS0 4044, Leather - Preparation of chemical test samples. 5.2 Beaker, of capacity 250 ml. 3 Principle Oxidation of a test portion in a Parr bomb under alkaline condi- tions to destroy organic matter and to solubilize the miner
16、al matter. Formation of the molybdosilicate complex and spec- trometric measurement at a wavelength of 630 nm. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Concentrated sulfuric acid, g20 = 1,83 g/ml, dil
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