Method for detecting benzopyrene (a) in lubricating oil (grease)
A detection method and grease technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of complex matrix, matrix interference, and inability to realize effective detection, and achieve low interference, high accuracy, and easy detection of large batches of samples Effect
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Embodiment 1
[0029] Embodiment 1: The specific steps of the detection method of benzo(a)pyrene in this lubricating oil (grease) are as follows.
[0030] (1) Standard curve: Accurately weigh 10 mg (accurate to 0.1 mg) of BaP standard substance in a 100 mL volumetric flask, dissolve with methanol and constant volume, and make 0.1 mg·mL -1 standard stock solution. Its working curve is gradually diluted from the standard stock solution to a mass concentration of 5.0, 10.0, 50.0, 100.0, 150.0, 200.0 μg L -1 A series of standard solutions were injected according to the above test conditions to make a standard curve for analysis.
[0031] (2) Sample extraction: Accurately weigh 1.0g (accurate to 0.0001g) of grease sample into a 25mL volumetric flask, add 10mL of cyclohexane-ethyl acetate (1:1, v / v) mixed solution, ultrasonic for 15min, Cool to room temperature, add cyclohexane-ethyl acetate (1:1, v / v) mixed solution to make up to volume. The extract was transferred to a centrifuge tube, centri...
Embodiment 2
[0040] Embodiment 2: The specific steps of the detection method of benzo(a)pyrene in this lubricating oil (grease) are as follows.
[0041] (1) Standard curve: Accurately weigh 10 mg (accurate to 0.1 mg) of BaP standard substance in a 100 mL volumetric flask, dissolve in methanol and constant volume, and make 0.1 mg·mL -1 standard stock solution. Its working curve is gradually diluted from the standard stock solution to a mass concentration of 5.0, 10.0, 50.0, 100.0, 150.0, 200.0 μg L -1 A series of standard solutions were injected according to the above test conditions to make a standard curve for analysis.
[0042] (2) Sample extraction: Accurately weigh 1.5 g (accurate to 0.0001 g) of lubricating oil sample into a 20 mL volumetric flask, add 10 mL of cyclohexane-ethyl acetate (1:1, v / v) mixed solution, and ultrasonically After 10 min, cool to room temperature, add cyclohexane-ethyl acetate (1:1, v / v) mixed solution to make up to volume. The extract was transferred to a c...
Embodiment 3
[0047] Embodiment 3: The specific steps of the detection method of benzo(a)pyrene in this lubricating oil (grease) are as follows.
[0048] (1) Standard curve: Accurately weigh 10 mg (accurate to 0.1 mg) of BaP standard substance in a 100 mL volumetric flask, dissolve with acetonitrile and make up to 0.1 mg·mL -1 standard stock solution. Its working curve is gradually diluted from the standard stock solution to a mass concentration of 5.0, 10.0, 50.0, 100.0, 150.0, 200.0 μg L -1 A series of standard solutions were injected according to the above test conditions to make a standard curve for analysis.
[0049] (2) Sample extraction: Accurately weigh 0.5 g (accurate to 0.0001 g) of grease sample into a 10 mL volumetric flask, add 5 mL of cyclohexane-ethyl acetate (1:1, v / v) mixed solution, and ultrasonically 3 times, 30 min each time, cooled to room temperature, and distilled cyclohexane-ethyl acetate (1:1, v / v) mixed solution to volume. The extract was transferred to a centri...
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