GB/T 14454.4-2008 PDF EnglishUS$85.00 · In stock · Download in 9 seconds
GB/T 14454.4-2008: Fragrance/Flavor substances -- Determination of refractive index Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 14454.4: Historical versions
Similar standardsGB/T 14454.4-2008: Fragrance/Flavor substances -- Determination of refractive index---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT14454.4-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.60 Y 41 Fragrance/flavor substances – Determination of refractive index (ISO 280:1998, Essential oils – Determination of refractive index, MOD) ISSUED ON: JULY 15, 2008 IMPLEMENTED ON: NOVEMBER 1, 2008 Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 5 4 Principle ... 6 5 Reagents ... 6 6 Apparatus ... 6 7 Operating procedures ... 6 8 Determination ... 7 9 Expression of results ... 7 10 Test report ... 7 Annex A (Normative) Operating procedure of abbe refractometer ... 9ForewordGB/T 14454, Fragrance/Flavor substances - General test methods, comprises the following parts: -- Part 1: Fragrance/Flavor substances - Preparation of test samples; -- Part 2: Fragrance/Flavor substances - Method for valuation of odour; -- Part 4: Fragrance/Flavor substances - Determination of refractive index; -- Part 5: Fragrance/Flavor substances - Determination of optical rotation; -- Part 6: Fragrance/Flavor substances - Quantitative evaluation of residue on evaporation; -- Part 7: Fragrance/Flavor substances - Determination of freezing point; -- Part 11: Fragrance/Flavor substances - Determination of content of phenols; -- Part 12: Fragrance/Flavor substances - Method for determination of trace chlorinated compounds; -- Part 13: Fragrance/Flavor substances - Determination of carbonyl value and carbonyl compounds content; -- Part 14: Fragrance/Flavor substances - Preparation of standard solution test solution and indicator solution; -- Part 15: Oil of sassafras - Determination of safrole and isosafrole content - Gas chromatographic method on packed columns. This Part is Part 4 of GB/T 14454. This Part modifies and adopts ISO 280:1998, Fragrance/Flavor substances - Determination of refractive index. Compared with ISO 280:1998, the major technical differences of this Part are as follows: -- the sampling method and repeatability of ISO 280:1998 are deleted; -- Annex A is added. This Part is a revision of GB/T 14454.4-1993, Fragrance/Flavor substances - Determination of refractive index. Compared with GB/T 14454.4-1993, the major changes of this Part are as follows: -- the sampling method of GB/T 14454.4-1993 is deleted; -- the conversion formula of refractive indexes at temperature t’ and t is added; Fragrance/Flavor substances – Determination of refractive index1 ScopeThis Part of GB/T 14454 specifies the method for the determination of refractive index of fragrance/flavor substances. This Part applies to the determination of refractive index of fragrance/flavor substances.2 Normative referencesThe provisions in following documents become the provisions of this Part through reference in this Part. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part. However, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 14454.1, Fragrance/Flavor substances - Preparation of test samples (GB/T 14454.1-2008, ISO 356:1996, MOD)3 Terms and definitionsFor the purposes of this Part of GB/T 14454, the following terms and definitions apply. 3.1 refractive index ratio of the sine of the angle of incidence to the sine of the angle of refraction, when a ray of light of defined wavelength passes from air into the essential oil kept at a constant temperature NOTE: The wavelength specified is 589.3 nm ± 0.3 nm corresponding to the D1 and D2 lines of the sodium spectrum.4 PrincipleAccording to the type of instrument used, either the angle of refraction is directly measured or the limit of total reflection is observed, the oil being maintained under conditions of isotropism and transparency.5 Reagents5.1 All reagents used are analytically pure reagents, and water is distilled water or water of equivalent purity. 5.2 Standard products, of refractometry grade, to adjust the refractometer, as follows: 5.2.1 Distilled water, of refractive index 1.333 0 at 20°C. 5.2.2 p-Cymene, of refractive index 1.490 6 at 20°C. 5.2.3 Benzyl benzoate, of refractive index 1.568 5 at 20°C. 5.2.4 1-Bromonaphthalene, of refractive index 1.658 5 at 20°C.6 ApparatusCommonly-used laboratory apparatus, especially the following apparatus: 6.1 Refractometer, allowing direct readings of refractive indices between 1.300 0 and 1.700 0 to be made with an accuracy of ± 0.000 2. 6.2 Thermostat or apparatus for temperature maintenance, which ensures a circulation of water through the refractometer, thus keeping the instrument at the reference temperature to within ± 0.2°C. 6.3 Light source, sodium light. NOTE: Diffused daylight or light from an electric lamp may be used for refractometers fitted with an achromatic compensator. 6.4 Plate of grass (optional), of known refractive index.7 Operating procedures7.1 Preparation of test sample Prepare the test sample in accordance with GB/T 14454.1. Bring the test sample to ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 14454.4-2008 be delivered?Answer: The full copy PDF of English version of GB/T 14454.4-2008 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 14454.4-2008_English with my colleagues?Answer: Yes. 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