Rapid detection method of residual amount of dimethylformamide in textiles
A dimethylformamide and detection method technology, applied in the field of rapid detection of dimethylformamide residues in textiles, can solve the problems of false positives, easy interference, and long time consumption, and achieve easy promotion, Environmentally friendly and method sensitive results
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Embodiment 1
[0030] DMF standard solution: add about 50mL of methanol in advance to a 100mL volumetric flask, and then add 50.0 mg of DMF to prepare a 0.5 mg / mL methanol solution.
[0031] Internal standard (chlorobenzene) standard solution: add about 50mL of methanol to a 100mL volumetric flask, then add 50.0 mg of chlorobenzene, then add methanol to the mark to prepare a 0.5 mg / mL methanol solution.
[0032] The samples were pretreated first, shredded and mixed. Accurately weigh 1.0 g of the sample to be tested and place it in a pre-dried headspace vial, add 2.0 μL of internal standard (chlorobenzene) standard solution, seal and mix well.
[0033] Sample pretreatment for adding standard samples: Accurately weigh 1.0 g of the sample to be tested and place it in a headspace vial, add 2.0 μL internal standard (chlorobenzene) standard solution, and add 2.0 μL DMF standard solution, seal and mix well.
[0034] The two samples were equilibrated in an oil bath at 40°C for 10 min, then inserted...
Embodiment 2
[0037] DMF standard solution: Accurately weigh 200.0 mg DMF into a 100 mL volumetric flask to prepare a 2.0 mg / mL methanol solution.
[0038] Internal standard (chlorobenzene) standard solution: Accurately weigh 200.0 mg of chlorobenzene into a 100 mL volumetric flask to prepare a 2.0 mg / mL internal standard solution of chlorobenzyl alcohol.
[0039] The samples were pretreated first, shredded and mixed. Accurately weigh 2.5 g of the sample to be tested and place it in a pre-dried headspace vial, add 2.0 μL of internal standard (chlorobenzene) standard solution, seal and mix well.
[0040] Sample pretreatment for adding standard samples: Accurately weigh 2.5 g of the sample to be tested and place in a headspace vial, add 2.0 μL internal standard (chlorobenzene) standard solution, and add 2.0 μL DMF standard solution, seal and mix well.
[0041] The two samples were equilibrated in an oil bath at 60°C for 5 min, then inserted into the solid-phase microextraction head, extracte...
Embodiment 3
[0044] DMF standard solution: Accurately weigh 500.0 mgDMF into a 100 mL volumetric flask to prepare a 5.0 mg / mL methanol solution.
[0045] Internal standard (chlorobenzene) standard solution: Accurately weigh 500.0 mg of chlorobenzene into a 100 mL volumetric flask to prepare a 5.0 mg / mL internal standard solution of chlorobenzyl alcohol.
[0046]The samples were pretreated first, shredded and mixed. Accurately weigh 5.0 g of the sample to be tested and place it in a pre-dried headspace vial, add 2.0 μL of internal standard (chlorobenzene) standard solution, seal and mix well.
[0047] Sample pretreatment for adding standard samples: Accurately weigh 5.0 g of the sample to be tested and place it in a headspace vial, add 2.0 μL internal standard (chlorobenzene) standard solution, and add 2.0 μL DMF standard solution, seal and mix well.
[0048] The two samples were equilibrated in an oil bath at 80°C for 3 min, then inserted into the solid-phase microextraction head, extract...
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