Method for quickly measuring methanal content in dried beancurd sticks
A technology for rapid determination of formaldehyde content, used in measuring devices, instruments, scientific instruments, etc., can solve the problems of long derivatization reaction time, unclear effluent, and many experimental steps, saving drugs, good symmetry, and peak shape. sharp effect
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[0015] detailed description
[0016] (1) Preparation of reagents and standard solutions: formaldehyde standard solution (Tianjin Guangfu Fine Chemical Research Institute, formaldehyde standard solution C=1.000 mg / mL ); Anhydrous sodium sulfate, ammonium acetate, glacial acetic acid, and acetylacetone are analytical reagents; the sample is commercially available yuba.
[0017] 40 mg / L Formaldehyde standard stock solution preparation: accurately absorb formaldehyde standard solution (1.000 mg / mL ) 4.00 mL Make the volume up to 100 with deionized water mL Volumetric flask. Keep refrigerated in the refrigerator.
[0018] 2.0 mg / L Formaldehyde standard solution preparation: accurately absorb formaldehyde standard stock solution 5.00 mL Make the volume up to 100 with deionized water mL Volumetric flask. Prepare on the day of use.
[0019] Preparation of Nash reagent: 150 g Ammonium acetate, 3.00 mL Glacial acetic acid, 2.0 mL Acetylacetone, dilute to 1 with deionized water L , S...
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