摘要
利用超临界CO2流体萃取的方法提取2甲4氯(MCPA),2,4-D和除草醚在三种土壤中的结合残留.结果表明,在培养200d的时间内,MCPA的结合残留量为1.0l-5.12mg·kg-1,占添加总量的2.0-10.1%;2,4-D的结合残留量为0.24-2.65mg·kg-1,占添加总量的0.5-5.3%;除草醚的结合残留量为6.53-19.30mg·kg-1,占添加总邑的12.9—38.2%.农药结合态与游离态含量的比值随时间的延长而增加.
In this paper, we used the method of supercritical CO2 extraction to extract bound pesticide residues from three kinds of soils. The pesticides included MCPA, 2,4-D and nitrofen. Within 200 days of incubation time, the concentration of bound residue of MCPA was 1.01?.12 mg昸g-1 in soils which was 2.0?0.1% of the fortification level; the concentration of bound residue of 2,4-D was 0.24?.65 mg昸g-1 which was 0.5?.3% of the fortification level; nitro-fen was 6.53?9.30mg昸g-1 which was 12.9?8.2% of the fortification level. The ratios bet-ween bound residues and extractable residues of 2,4-D and nitrofen were increasing with time.
出处
《环境化学》
CAS
CSCD
北大核心
2001年第6期577-581,共5页
Environmental Chemistry
基金
中国科学院资源与生态环境研究重大项目B资助的项目