Method for detecting normal hexane and cyclohexanone in retired plot soil
A detection method, the technology of n-hexane, applied in the field of detection of n-hexane and cyclohexanone in soil, can solve the problems of lack of detection methods for n-hexane and cyclohexanone, and achieve low detection limit, high extraction efficiency and precision and accurate and reliable results
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Embodiment 1
[0047] see Figure 1-9 , a kind of detection method of n-hexane and cyclohexanone in decommissioned plot soil, comprises the following steps:
[0048] S1. Sample collection: use HC-Z450 drilling rig special soil sampling and drilling equipment to collect soil samples from a decommissioned plot, use a non-disturbance sampler to collect about 5.00g of soil samples, put them in a 40mL brown purge bottle, and add Magnetic stirring bar, sealed bottle cap;
[0049] Among them, the disturbance of soil samples should be minimized during the collection process, the samples should not be homogenized, and mixed samples should not be collected;
[0050] S2. Sample analysis: The collected samples are transported and stored in a frozen blue ice incubator, transferred to the laboratory, placed in a purge and trap device, and the positive self in the soil is extracted under the best purge and trap conditions. Alkanes and cyclohexanone, the content of n-hexane and cyclohexanone in the soil o...
Embodiment 2
[0089] Purge-and-trap-gas chromatography-mass spectrometry experiments were performed under different purge-and-trap conditions by the control variable method to verify the optimal purge-and-trap conditions:
[0090] Take the solutions with mass concentrations (n-hexane: 250 μg / L; cyclohexanone: 2000 μg / L; toluene-d8: 200 μg / L; chlorobenzene-d5: 50 μg / L) through the purge and trap instrument and gas chromatography-mass spectrometry Injection analysis of the hyphenated instrument, its ion flow diagram is obtained in the full scan mode to verify the feasibility of the experimental results under different purge and trap conditions;
[0091] see Figure 4 , is the total ion current chromatogram of normal hexane, cyclohexanone, toluene-d8 and chlorobenzene-d5 under standard solution sample test;
[0092] When implementing step 3, the following data can be used for the purge and trap conditions under the control variable method:
[0093] Fix other purge and trap conditions unchang...
Embodiment 3
[0109] Preliminary investigation and environmental testing on the soil pollution status of decommissioned plots of a Zhejiang Biotechnology Co., Ltd. involved the use of n-hexane and cyclohexanone in the raw materials of the company's products. The detection method is very necessary, including the following steps:
[0110] S1. Sample collection: use HC-Z450 drilling rig special soil sampling and drilling equipment to collect soil samples S24-1 (0-0.5m) and S15-1 (0-0.5m) of the decommissioned plot. Minimize the disturbance of the soil samples, collect about 5.00g soil samples with a non-disturbance sampler, do not homogenize the samples, do not collect mixed samples, collect 6 parallel samples of the same point sample, and place them in a 40mL brown purge In the bottle, add a magnetic stir bar and seal the bottle cap;
[0111] Among them, for high-concentration samples (preliminary estimate of the content of the analyte greater than 1000μg / kg, the data comes from the photoion...
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