Vodka/other physicochemical component detection

5.5.2 Colorimetry 5.5.2.1 Principle: Esters react quantitatively with hydroxylamine in an alkaline solution to generate oximic acid, which forms a yellow complex with iron ions in an acidic solution. At a certain alcohol concentration, the concentration of the ester is directly proportional to the absorbance of the yellow complex at a wavelength of 525 nm. 5.5.2.2 Instrument 5.5.2.2.1 Spectrophotometer: visible light range, cuvette 1 cm. 5.5.5.2.2.2 Full glass still: 500 mL distillation flask. 5.5.2.2.3 Full glass reflux device: 1 000 mL conical flask, 250 mL (the length of the condensing tube is not less than 45 cm). 5.5.2.2.2.4 Colorimetric tube with stopper: 25 mL. 5.5.2.2.5 Micro burette: 5 rmL. 5.5.2.3 Reagents and Solutions 5.5.2.3.1 Hydroxylamine Hydrochloride Solution (2 mol/L): Weigh 13.9g of hydroxylamine hydrochloride and dissolve it in 100 mL of water. Store in the refrigerator. 5.5.2.3.2 Sodium hydroxide solution [c (NaOH) -=3.5 mol/L]: prepared according to GB/T 601. 5.5.2.3.3 Hydrochloric acid solution [c< HCI) -4 mol/L]: prepared according to GB/T 601. 5.5.2.3.4: Ferric chloride solution (100 g/L): Weigh 50 g of ferric chloride (FeCl · 6H; O), dissolve in 400 mL of water, and then add 12.5 mL of hydrochloric acid solution (5.5.2.3.3). Dilute to 500 mL with water (if there is residue, filter before use). 5.5.2.3.5 40% ethanol (ester free) solution; measure 600 mL of 95% ethanol into a 1000 mL conical flask, add 5 mL of sodium hydroxide solution (5.5.2.3.2), heat and reflux to saponify for 1 hour. Then transfer to a still for re evaporation, and prepare a 40% ethanol solution. 5.5.2.3.6 Ethyl acetate standard stock solution: Weigh 0.166 7 g of ethyl acetate and dilute to 500 mL with a 40% ethanol solution. This solution contains 0.333 4 mg of ethyl acetate per milliliter. 5.5.2.3.7: Ethyl acetate series standard solution; Take 0.0 mL, 0.75 mL, 1.5 mL, and 2 Place 25 mL, 3.0 mL, and 4.5 mL of ethyl acetate standard stock solution (5.5.2.3.6) in six 100 mL volumetric flasks, dilute to the mark with 40% ethanol solution, and mix well. These standard solutions contain ethyl acetate at concentrations of 0.0 mg/L, 2.50 mg/L, 5.00 mg/L, 7.50 mg/L, 10.00 mg/L, and 15.00 mg/L

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms

3. Used as a sales report: issuing legally effective testing reports to make consumers more confident

4. Papers and research: Provide professional personalized testing needs

5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

BAIJIAN testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Our Competitive Edge:

1. The testing industry is fully covered, meeting different testing needs

2. Fully cover the laboratory and allocate localized testing nearby

3. Engineers provide one-on-one services to make testing more accurate

4. Free initial testing, with no testing fees charged

5. Self service order delivery for free on-site sampling

6. Short cycle, low cost, and attentive service

7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China