SN/T 0859-2016Determination of dehydroacetic acid in condiments for export--Ultraviolet spectrophotometric method (English PDF)
出口调味料中脱氢乙酸的测定 紫外分光光度法
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Issued by
The General Administration of Quality Supervision, Inspection and Quarantine
Level / Type
National · Recommended
Issue date
August 23, 2016
Implementation date
March 1, 2017
Scope
SN/T 0859-2016 is the English-translated version of 出口调味料中脱氢乙酸的测定 紫外分光光度法.
SN/T 0859-2016 — This standard specifies the method for determining the content of dehydroacetic acid in export seasonings by ultraviolet spectrophotometry. This standard is applicable to the determination of dehydroacetic acid content in export soy sauce (soy sauce soy sauce, soy sauce soy sauce), vinegar, oyster sauce, barbecue sauce and sauce.
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Document preview — SN/T 0859-2016
National Standard of the People's Republic of China
- Classification
- X 66
- Replacing
- SN/T 0859-2000
Issued by: The General Administration of Quality Supervision, Inspection and Quarantine
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Determination method
- 3.1 Principle of the method
- 3.2 Reagents and materials
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces SN/T 0859-2000 "Determination of Dehydroacetic Acid in Import and Export Soy Sauce". This standard and SN/T 0859-Compared with 2000, the main technical changes except editorial changes are as follows.
--- The scope of application is based on the original standard (soy sauce), adding vinegar, oyster sauce, barbecue sauce, sauce;
--- Increased the limit of quantitative detection (LOQ).
This standard is proposed and managed by the National Certification and Accreditation Administration.
This standard was drafted. Shanghai Entry-Exit Inspection and Quarantine Bureau of the People's Republic of China, Guangdong Entry-Exit Inspection and Inspection Epidemic situation.
1 Scope
This standard specifies the method for determining the content of dehydroacetic acid in export seasonings by ultraviolet spectrophotometry.
This standard is applicable to the determination of dehydroacetic acid content in export soy sauce (soy sauce soy sauce, soy sauce soy sauce), vinegar, oyster sauce, barbecue sauce and sauce.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
3 Determination method
3.1 Principle of the method
The dehydroacetic acid in the sample is subjected to steam distillation and organic solvent extraction under acidic conditions, and then irradiated with ultraviolet spectrophotometer at 308 nm.
The absorbance was measured in the strength and compared with the standard.
3.2 Reagents and materials
Unless otherwise specified, the reagents used in this method are of analytical grade. The water is the third grade water specified in GB/T 6682.
3.2.1 15% (mass concentration) tartaric acid solution. Weigh 15g of tartaric acid, add water to dissolve to 100mL.
3.2.2 Sodium chloride.
3.2.3 Silicone resin. liquid, industrial grade, used for defoaming.
3.2.4 Hydrochloric acid (rho=1.19g/mL).
3.2.5 Hydrochloric acid solution (19, volume ratio). 10 mL of hydrochloric acid was slowly added to 90 mL of water.
3.2.6 Ether.
3.2.7 Sodium bicarbonate.
3.2.8 1% (mass concentration) sodium bicarbonate solution. 1 g of sodium hydrogencarbonate was weighed and dissolved in water to a volume of 100 mL.
3.2.9 2mol/L sodium chloride solution. Weigh 11.7g of sodium chloride and dissolve it to 100mL with water.
3.2.10 2mol/L hydrochloric acid solution. Take 16.7mL hydrochloric acid and add water to 100mL.
3.2.11 Hydrochloric acid-sodium chloride solution. Pipette 2mol/L sodium chloride solution (3.2.9) 50mL and 2mol/L hydrochloric acid solution (3.2.10) 1 mL, after mixing, diluted to.200 mL with water.
3.2.12 anhydrous sodium sulfate.
3.2.13 sodium hydroxide.
3.2.14 0.1mol/L sodium hydroxide solution. Weigh 4g of sodium hydroxide, dissolved in water to a volume of 1L.
3.2.15 Dehydroacetic acid standard solution. accurately weigh 0.1000g dehydroacetic acid standard in 6mL (0.1mol/L) sodium hydroxide solution (3.2.14), dilute to 100 mL with water, ie a standard stock solution with a concentration of 1 mg/mL. Dilute to 20µg/mL with water when using Hydrogen acetic acid standard working fluid.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.
Referenced standards
Normative references
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