Method for detecting phthalate ester plasticizer in plastic
A technology of phthalic acid and ester plasticizers, which can be used in measurement devices, analytical materials, solid solvent extraction, etc. The effect of fast measurement speed, reduced inspection investment and low operating cost
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[0027] Example 1
[0028] In order to achieve rapid and sensitive detection of plasticizers in plastic products, the present invention uses ion mobility spectrometry as an analysis means, combined with a simple sample pretreatment technique such as solvent extraction.
[0029] This method has low requirements for sample pretreatment, and it can be extracted with organic solvent methanol. The specific steps are as follows: accurately weigh 0.5g of plastic sample into a test tube, add 10mL of analytically pure organic solvent methanol to extract 0.1-2min (special material plastic The product needs longer time), and the extract can be directly used for detection and analysis.
[0030] The process of using ion mobility spectrometer to detect phthalate esters is as follows: extract 20-50μL of the above extraction solution, drop it on a clean polytetrafluoroethylene sheet, evaporate the methanol, and insert it into the injection port of the instrument. The sample containing phthalate este...
Example Embodiment
[0034] Example 2
[0035] Different plasticizers (phthalates) have different peak times and can be used for qualitative analysis. Moreover, when the sample contains two or more phthalate plasticizers, it can be detected by ion mobility spectrometer at the same time. The analytical test method is the same as that of Example 1.
[0036] image 3 Shown are the comparative migration spectra of different phthalate esters detected by ion mobility spectrometer. The three esters as shown in the figure are well detected. The characteristic peak of dibutyl phthalate is at 9.6ms, and the characteristic peak of dinonyl phthalate is at 13.1ms. The characteristic peak is at 13.5ms.
[0037] Figure 4 The migration spectrum of two phthalate esters separated in one experiment is given. Phthalate plasticizers with different peak times can be detected and separated simultaneously.
Example Embodiment
[0038] Example 3
[0039] In daily life, people often use plastic and water in contact. Therefore, under this condition, the dissolution and detection of the plasticizer were studied.
[0040] In life, if the plastic is in boiling water for a certain period of time or some plastic products are used in the microwave oven. The plasticizers in the plastic ooze out.
[0041] The difference from Example 1 is that the sample pretreatment steps are as follows: accurately weigh 1g plastic sample (cut into small pieces, about 0.5mm*0.5mm in size), soak in water (10mL), heat and boil for more than 5 minutes or Microwave treatment for 0.5-2min (or longer) to dissolve the phthalate plasticizer in the plastic sample in water, and then use organic solvent (dichloromethane) for liquid-liquid extraction; take 20-50μL for extraction After the organic solvent is put into the sampler of the ion mobility spectrometer rapid detector, it can be directly used for detection;
[0042] Figure 5 shows the pl...
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