Lactic acid bacteria beverage testing

This standard specifies the graphite furnace and flame atomic absorption spectrometry, inductively coupled plasma mass spectrometry, and inductively coupled plasma emission spectrometry for the determination of copper content in food. This standard is applicable to the determination of copper content in various foods. After the sample is digested and treated, it is atomized in a graphite furnace and the absorbance is measured at 324.8 nm. The absorbance value of copper is directly proportional to the copper content within a certain concentration range, and is quantitatively compared to the standard series. Unless otherwise specified, the reagents and materials used in this method are all high-grade pure and will always be Grade II water as specified in GB/T 6682. 3.1 Reagent injection 3.1.1 Nitric acid (HNOj), 3.1.2 Perchlorate acid (HCIO), 3.1.3 Ammonium dihydrogen phosphate (NHH, PO,). 3.1.4 Palladium nitrate [Pd (NOR): 7. 3.2 Reagent preparation 3.2.1 Nitric acid solution (5+95): Measure 50 mL of nitric acid, slowly add to 950 mL of water, and mix well. 3.2.2 Nitric acid solution (1+1): Measure 250 mL of nitric acid, slowly add to 250 mL of water, and mix well. 3.2.3: Ammonium dihydrogen phosphate palladium nitrate solution: Weigh 0.02g of palladium nitrate, add a small amount of nitric acid solution (1+1) to dissolve, then add 2g of ammonium dihydrogen phosphate, and dissolve with nitric acid solution (5+95) Dilute to 100 mL and mix well. 3.3 Standard copper sulfate pentahydrate (CuSO, · 5H, O, CAS number 7758-99-8); A copper standard solution with a purity of ≥ 99.99% or a certain concentration certified by the state and granted a standard substance certificate

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