Detection filter paper and application for detecting phenylenediamine substances in cosmetics
A technology of cosmetics and filter paper, applied in the field of physical and chemical analysis of chemical substances, can solve the problems of expensive equipment, high requirements for detection environment, inconvenient supervision and use, etc., and achieve the effect of eliminating color background interference, low cost and ideal effect
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Embodiment 1
[0056] Embodiment 1: the physicochemical reaction of p-phenylenediamine, o-phenylenediamine and m-phenylenediamine reference substance and calcium hypochlorite
[0057] Take p-phenylenediamine, o-phenylenediamine and m-phenylenediamine reference substance about 0.5g each, put in a 100ml measuring bottle, add ethyl acetate to dissolve and dilute to the mark, as the respective reference substance stock solution.
[0058] Take an appropriate amount of p-phenylenediamine stock solution and put it in different test tubes, add 1ml of dilute hydrochloric acid respectively, shake it, let it stand for a while, take 4 drops and 5 drops of the lower layer solution respectively, and add 1 drop of calcium hypochlorite saturated On the qualitative filter paper of the solution, it is purple. See figure 1 , figure 1 It is the color chart of 3 minutes after p-phenylenediamine was added dropwise.
[0059] Take an appropriate amount of m-phenylenediamine stock solution and put it in a differe...
Embodiment 2
[0061] Embodiment 2: the chromogenic detection of sample
[0062] Sample 14 was randomly selected from the collected samples. The relevant information of sample 14 is shown in Table 7. Take about 1.5 g of sample 14 and place it in a 15 ml stoppered test tube, add 9 ml of ethyl acetate, tighten the stopper, and shake vigorously for 1 minute Let it dissolve, let it stand for a while, take 6ml of the upper layer solution, put it in a test tube, add 1ml of dilute hydrochloric acid, shake to mix evenly, let it stand for a while, take 5 drops of the lower layer solution, and add it to the saturated solution of calcium hypochlorite before use. 1 drop of qualitative filter paper, purple. The color development of sample 14 is as follows Figure 4 as shown, Figure 4 It showed that the test result of sample 14 was positive for p-phenylenediamines.
Embodiment 3
[0063] Embodiment 3: semi-quantitative detection
[0064] Prepare different concentrations of p-phenylenediamine reference substance solutions, take 5ml each and extract with 1ml of dilute hydrochloric acid, take 5 drops of the lower layer solution and drop it on the filter paper with 1 drop of calcium hypochlorite saturated solution, within 3 minutes, it will appear purple and the color It becomes lighter as the concentration of the reference substance decreases. When the concentration is less than 1.0%, it is lavender; when the concentration is 1.0%-2.0%, it is purple; when the concentration is 4.0%-8.0%, it is dark purple. see results Figure 5-6 , ( Figure 5 The concentrations from left to right are: 0.2%, 0.4%, 0.6%, 0.8%, 1.0%, Figure 6 Concentrations from left to right are 2.0%, 4.0%, 6.0%, 8.0%). This method can realize the semi-quantitative detection of p-phenylenediamines.
[0065] Sample 15 was randomly selected from the collected samples. The relevant inform...
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Abstract
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