Method for extracting and purifying octachlorodipropyl ether in soil
A technology of octachlorodipropyl ether and soil purification, which is applied in the direction of measuring devices, instruments, scientific instruments, etc. It can solve the problems of affecting the accuracy of instrument results, unreasonable sulfonation steps, and complex composition of extracts, and achieves easy filling, The effect of short extraction time and short consumption time
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Embodiment 1
[0018] Example 1 The extraction and determination of octachlorodipropyl ether in vegetable base soil
[0019] 1. Soil sample preparation
[0020] Soil samples of Chinese cabbage, lettuce, and Shanghai green were collected in the vegetable base of South China Agricultural University, the gravel and plant residues in the soil samples were removed, air-dried naturally, then ground, passed through a 18-mesh sieve, and set aside.
[0021] 2. Ultrasonic and centrifugal extraction
[0022] Weigh about 10.00g of soil sample into a conical flask, add 20mL n-hexane-acetone extract (volume ratio about 22:3), ultrasonically extract for 10min, transfer the extract to a 100mL centrifuge tube, centrifuge at 4000r / min for 5min, transfer The supernatant was placed in a round-bottomed flask, and the supernatant was ultrasonically extracted and centrifuged twice, and the supernatant was concentrated to 5 mL in a vacuum rotary evaporator.
[0023] 3. Column chromatography cleanup
[0024] The...
Embodiment 2
[0044] Comparison of octachlorodipropyl ether recovery rate in different methods of embodiment 2
[0045] Set up the following experimental groups:
[0046] The first group: solvent blank, the solvent is n-hexane-acetone mixture (volume ratio 22:3);
[0047] The second group: soil blank, take the soil without octachlorodipropyl ether as a blank control;
[0048] The third group: solvent spike, add octachlorodipropyl ether to n-hexane-acetone mixture, the concentration is 5.0μg / mL;
[0049] The fourth group: soil spiked, adding octachlorodipropyl ether to the soil without octachlorodipropyl ether, the concentration is 10 μg / g;
[0050] Each of the above groups was tested according to steps 2 to 6 in Example 1, and the test results were as follows: the first and second groups did not detect octachlorodipropyl ether, and the recovery rate of the third group of octachlorodipropyl ether was 92.4%. , the recovery rate of the fourth group was 90.4%. .
Embodiment 3
[0051] Example 3 Preparation of the Extraction and Determination of Octachlorodipropyl Ether in Contaminated Soil
[0052] Weigh 5kg of vegetable garden soil, red soil and paddy soil respectively, and then add different amounts of octachlorodipropyl ether to make polluted soil with octachlorodipropyl ether concentration of 10mg / kg, and plant Chinese cabbage. Soil samples were collected during the vegetable harvest period, extracted and detected according to the steps in Example 1, and the results found that the average content of octachlorodipropyl ether in vegetable garden soil, red soil, and paddy soil was 3.76 mg / kg, 3.46 mg / kg, respectively. kg, 1.86mg / kg. After extracting and testing the cabbage hearts harvested on different soils, it was found that octachlorodipropyl ether was found in the cabbage hearts, indicating that the pollutants in the soil had been partially transferred to the crops.
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