Method for rapidly screening free formaldehyde in cosmetics onsite
A technology for free formaldehyde and cosmetics, applied in the field of chemical analysis, can solve the problems of high cost, time-consuming pretreatment method, limited application scope, etc., and achieve the effect of bright color gradation, simple and fast method
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Embodiment 1
[0028] Preparation of standard color chart
[0029] Take formaldehyde standard stock solution 0, 0.5, 1.0, 2.0, 3.0, 4.0mL in a 50mL headspace bottle with a 5mL scale, add water to the 5mL scale, oscillate to mix, seal, heat in a porous electric heating mantle at 85°C for 30min, Use a 30mL glass syringe to draw 10mL of gas on the liquid surface of the headspace bottle, quickly inject it into a colorimetric tube containing 1mL of phenol reagent absorption solution, shake and absorb it, add 2mL ferric ammonium sulfate solution, dilute to 10mL, shake well, and place for 5min Afterwards, take a picture of the colored solution, collect the color and make it into a standard color card (see figure 1 ).
Embodiment 2
[0031] Weigh 1.00g of a certain hand lotion into a 50mL headspace bottle with a 5mL scale, add water to the 5mL scale, oscillate to mix, seal, heat in a porous electric heating mantle at 85°C for 30min, and use a 30mL glass syringe to fill the liquid in the headspace bottle Extract 10mL of formaldehyde vapor from the surface, quickly pour it into a colorimetric tube containing 1mL of phenol reagent absorption solution, add 2mL ferric ammonium sulfate solution after shaking and absorbing, add water to make the volume to 10mL, shake well, and observe the color of the solution after standing for 5min. Yellowish green, indicating that the sample contains free formaldehyde. The color of the sample is compared with the standard color card, which is close to the color of the 0.05% standard solution. The free formaldehyde in this sample is estimated to be around 0.05%, less than 0.2%, and the screening result is negative.
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