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| Establishment of Sample Pretreatment Method for the Determination of Low Levels of DDTs in Soils |
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| DOI：10.3969/j.issn.1004-4957.年份.月份 |
| KeyWord:four-channel purification chromatography sample pre-treatment soil DDTs GC/ECD |
| Author | Institution |
| 隋红，吴鹏，宋静，黄玉娟，李清波，余海波，吕明超 |
1.天津大学化工学院;2.中国科学院土壤环境与污染修复重点实验室南京土壤研究所;3.中国科学院大学;4.大连海事大学环境科学与工程学院 |
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| Abstract: |
| A new sample purification method was developed for the determination of low levels of DDTs in soils.The tested soil was extracted with a mixture of hexane-acetone(1∶1) by ultrasonic method.The soil extracts was purified with a patented four-channel purification chromatograph before analysis by gas chromatography with electron capture detector(GC/ECD).Effects of different column packs and elution solvents on recoveries of DDTs were investigated.The results showed that by using ultrasonic extraction，new mixed filling material for the chromatogram column and elution with dichloromethane-n-hexane(4∶1)，the recoveries of DDTs were between 83.5% and 90.3%，and the method detection limits were between 2.0 ng?g-1 and 5.4 ng?g-1，implying that the method can be used for the determination of low levels of DDTs in soils.In addition，the spiked recoveries of DDTs based on the ultrasonic extraction and Soxhlet extraction were compared under the optimal purification conditions.The results showed that the recovery of the Soxhlet extraction method is higher than that of the ultrasonic extraction method，but the the former need consume more time. |
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