Milk powder zinc testing

Service Details 1. Instrument: Flame Atomic Absorption Spectrophotometer 2. Principle: After sample processing, the sample is introduced into an atomic absorption spectrophotometer. After atomization, the resonance line at 213.8nm is absorbed, and its absorption value is proportional to the zinc content value. Quantitative comparison with the standard curve 3. Analysis Step: The sample is thoroughly mixed. Weigh 5-10 grams and place them in a porcelain crucible. Add 5mL of phosphoric acid and let it sit for 0.5 hours. Steam dry on low heat and continue heating for carbonization. Transfer to a muffle furnace and ash at 500 degrees Celsius for 8 hours. Remove and let it cool. Dissolve in 10mL of hydrochloric acid and place it in a 50mL volumetric flask for testing. 4. Zinc standard curve concentration: 0.0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0mg/L5. The treated sample solution, reagent blank solution, and zinc standard solution in each volumetric flask will be introduced to the flame atomic absorption spectrophotometer under the optimal conditions for determination. Reference conditions: lamp current 3-6mA, wavelength: 213.8nm. Draw a standard curve or linear regression equation with a gradient of zinc standard solution, compare the sample absorption value with the curve or bring it into the equation to obtain the content. The above article is a partial list. For more testing needs and details, please consult the online consultant of the free consulting agency: 152  0173  3840 (phone and WeChat), conducting testing on over a hundred inspection websites - issuing authoritative testing reports has legal effect

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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:

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4. Free initial testing, with no testing fees charged

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

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

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