Method for the determination of perfluorinated compounds in samples
A perfluorinated compound and sample technology, applied in the field of analytical chemistry, can solve the problems of low detection sensitivity and accuracy, low extraction technology and inaccurate detection of perfluorinated compounds, achieve high recovery rate, increase enrichment rate, and adsorption high efficiency effect
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Embodiment 1
[0034] The invention provides a method for measuring perfluorinated compounds in a sample, which comprises the following steps:
[0035] Step A, in parts by weight, weigh 30 parts by weight of coconut shells, 12 parts by weight of eggshells and 1 part by weight of walnut shells, wash them respectively, mix them in a water bath at 80°C, and boil them for 2 hours Filter and wash with water, repeatedly scouring and washing twice, then place in an oven at 100°C, take it out after 40 minutes and crush it through a 20-mesh sieve to obtain the first mixture; use 8% NaOH aqueous solution for the first mixture Soak for 2 hours, then boil for 40nm, stop heating and cool to room temperature naturally, filter and collect the first filter residue, wash with deionized water until neutral, then place it in an oven at 80°C, and take it out after 20min to obtain the second mixture;
[0036] Step B, adding the second mixture to a ferrous sulfate aqueous solution with a concentration of 0.15mol / ...
Embodiment 2
[0045] The invention provides a method for measuring perfluorinated compounds in a sample, which comprises the following steps:
[0046] Step A, in parts by weight, weigh 40 parts by weight of coconut shells, 15 parts by weight of eggshells and 3 parts by weight of walnut shells, wash and mix them respectively and place them in a water bath at 80°C, and boil them for 2 hours Filter and wash with clean water, repeatedly scouring and washing for 4 times, place in an oven at 100°C, take it out after 50 minutes and crush it through a 40-mesh sieve to obtain the first mixture; use the first mixture with a mass concentration of 8-15% Soak in NaOH aqueous solution for 5 hours, then boil for 70nm, stop heating and cool to room temperature naturally, filter and collect the first filter residue, wash it with deionized water until neutral, then place it in an oven at 100°C, and take it out after 30min to obtain the second mixture;
[0047] Step B, adding the second mixture to the ferrous...
Embodiment 3
[0056] The invention provides a method for measuring perfluorinated compounds in a sample, which comprises the following steps:
[0057] Step A, in parts by weight, weigh 35 parts by weight of coconut shells, 14 parts by weight of eggshells and 2 parts by weight of walnut shells, wash and mix them in a water bath at 80°C, and boil for 2 hours Filter and wash with water, repeatedly scouring and washing for 3 times, then place in an oven at 100°C, take it out after 45 minutes and crush it through a 30-mesh sieve to obtain the first mixture; use the first mixture with a mass concentration of 12% NaOH aqueous solution Soak for 4 hours, then boil for 55nm, stop heating and cool to room temperature naturally, filter and collect the first filter residue, wash it with deionized water until neutral, then place it in an oven at 90°C, and take it out after 25min to obtain the second mixture;
[0058] Step B, adding the second mixture into an aqueous ferrous sulfate solution with a concen...
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