Method for determining total fluorine compound precursor substances in atmospheric particulate matter sampling filter membrane
A technology of atmospheric particulate matter and perfluorinated compounds, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of increasing the detection cost of a single sample, achieve the effects of shortening the elution time, good separation effect, and improving detection efficiency
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Embodiment 1
[0060] Example 1 Determination of perfluorinated compound precursor substances in atmospheric particulate matter sampling filter membrane
[0061] The method for determining the precursors of perfluorinated compounds in the atmospheric particulate matter sampling filter membrane comprises the following steps:
[0062] 1) Extraction of samples: dry the air sampling filter membrane to a constant weight and cut it into 1*1cm size with clean scissors, add methanol 15mL to it, and add appropriate amount of internal standard M2-4:2FTS, M2-6:2FTS , M2-8:2FTS, M8FOSA, d3-N-MeFOSAA and d5-N-EtFOSAA, vortex for 5 minutes, then turn to horizontal vibration for 15 minutes, and then ultrasonically extract for 1 hour; ultrasonic conditions are: ultrasonic power 700W, ultrasonic frequency 45KHZ; temperature Control at 40°C; after ultrasonic extraction, transfer the supernatant to a clean centrifuge tube, then add 15 mL of methanol and repeat the above shaking and ultrasonic extraction steps ...
Embodiment 2
[0091] Example 2 The recovery rate test of perfluorinated compound precursors in air sampling membrane samples
[0092]The blank air sampling filter membrane (quartz filter membrane) was calcined in a muffle furnace at 450°C for 6 hours, cooled to room temperature, and dried in a desiccator to constant weight for use. Atmospheric sampling filter (quartz filter) samples were collected from the roof of the Sun Yat-sen University School of Public Health.
[0093] Take three blank filter membranes, cut each into four parts with the same area, take two parts for each and cut them into 1*1cm size. Use clean tweezers to clamp six pieces of filter membrane fragments representing the three blank filter membranes into six polypropylene centrifuge tubes, and add 15 mL of methanol to them.
[0094] After the atmospheric sampling filter membrane sample is dried to a constant weight, take three samples and use clean scissors to cut each filter membrane into four parts with the same area, a...
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