GB/T 33918-2017Fragrance/Flavor substances－Determination of peroxide value (English PDF)
香料 过氧化值的测定
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 33918-2017 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
July 12, 2017
Implementation date
February 1, 2018
Scope
GB/T 33918-2017 is the English-translated version of 香料 过氧化值的测定.
GB/T 33918-2017 gives the method for determining the peroxide value of fragrance and flavour substances, and applies to that determination. The peroxide value is defined as the amount of substance in the sample that oxidises potassium iodide under the specified operating conditions, expressed in millimoles of active oxygen per kilogram.
In the principle, the peroxides in the perfume react with potassium iodide to liberate free iodine, which is titrated with sodium thiosulfate solution, and the content is calculated from the titre.
The standard lists the reagents, all of analytical grade with distilled water or water of comparable purity boiled and cooled immediately before use: the glacial acetic acid and trichloromethane mixture in the ratio 3 to 2, the glacial acetic acid and cyclohexane mixture in the ratio 3 to 2, freshly prepared saturated potassium iodide solution, sodium thiosulfate standard solutions at 0.1 mol/L and 0.01 mol/L, and starch indicator solution at 10 g/L, with the preparation of each.
It cites GB/T 601. It was issued on 12 July 2017 and has applied since 1 February 2018.
Found what you need?
Document preview — GB/T 33918-2017
National Standard of the People's Republic of China
- ICS
- 71.100.60
- Classification
- Y 41
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Principle
- 5 Reagent
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the method of determination of perfume peroxide value.
This standard applies to the determination of perfume peroxide value.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 601 chemical reagent standard titration solution preparation
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Peroxide value
The amount of substance that oxidizes potassium iodide under the specified operating conditions of the sample, expressed in millimoles of active oxygen per kg.
4 Principle
Peroxide in spices, and potassium iodide role to generate free iodine, sodium thiosulfate solution titration, calculate the content.
5 Reagent
The reagents used are analytical reagents. Water is distilled water or water of comparable purity, boil and cool to room temperature immediately before use.
5.1 Glacial acetic acid - trichloromethane solution 3 volumes of glacial acetic acid are mixed with 2 volumes of trichloromethane.
5.2 Glacial acetic acid-cyclohexane solution. 3 volumes of glacial acetic acid are mixed with 2 volumes of cyclohexane.
5.3 saturated potassium iodide solution, freshly prepared
Preparation Methods Weigh 14g potassium iodide, add 10mL water to dissolve, if necessary, to make it slightly soluble in heat, cooled and stored in a brown bottle. (Indeed Paul solution in the presence of crystalline potassium iodide. )
5.4 Sodium thiosulfate standard solution, c (Na2S2O3) = 0.1mol/L
Preparation and calibration methods should be GB/T 601 implementation.
5.5 Sodium thiosulfate standard solution, c (Na2S2O3) = 0.01mol/L
Preparation Methods Pipette pipette 10.0mL0.1mol/L of sodium thiosulfate standard solution to 100mL volumetric flask, add water dilute Release to the mark.
5.6 Starch indicator solution (10g/L)
Weigh soluble starch 0.50g, add a little water, transferred into a paste, poured into 50mL boiling water and mix thoroughly, boil. Pro use now with.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
How to Download GB/T 33918-2017
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 601-2016 — Chemical Reagent - Preparations of Standard Volumetric Solutions
GB/T 6011-2005 — Test method for flammability characteristics of fiber-reinforced plastics-Incandescent rod method
GB/T 6011-2026 — Test method for the flammability characteristics of fibre reinforced plastics - Incandescent rod method
Secure payment via Stripe
Payments accepted
GB/T 33918-2017
$55.00