城市污泥和化肥对水稻土种植的通菜中邻苯二甲酸酯(PAEs)的影响

Effect of municipal sludge and chemical fertilizers on phthalic acid esters (PAEs) contents in Ipomoea aquatica grown on paddy soils

对水稻土施用城市污泥和化肥盆栽通菜 ,应用GC/MS联机检测技术对通菜中 6种邻苯二甲酸酯化合物 (PAEs)进行分析 ,探讨施肥对通菜中PAEs含量的影响 .结果表明 ,各处理通菜中 6种PAEs化合物的总含量 (∑PAEs)在 2 .12 9～ 7.111mg·kg-1之间 ,依次为广州污泥 +化肥 (7.111mg·kg-1) >广州污泥 (4.76 7mg·kg-1) >佛山污泥 (3.5 6 9mg·kg-1) >佛山污泥 +化肥 (3.30 5mg·kg-1) >化肥 (2 .6 38mg·kg-1) >空白对照 (2 .12 9mg·kg-1) ,显示了施肥造成通菜中∑PAEs不同程度的提高 .各处理通菜中的PAEs均以个别化合物为主 ,其中空白对照、化肥、佛山污泥和广州污泥处理的通菜中邻苯二甲酸丁基苄基酯 (BBP)占∑PAEs的 4 0 %～ 81% ,佛山污泥 +化肥处理的通菜中邻苯二甲酸正二丁酯 (DnBP)占∑PAEs的 5 6 % ,而广州污泥 +化肥处理的通菜中邻苯二甲酸丁基苄基酯 (BBP)、邻苯二甲酸正二辛酯 (DnOP)和邻苯二甲酸 (2 乙基己基 )酯 (DEHP)各占∑PAEs的 30 %左右 .

GC/MS determinations on six phthalic acid esters (PAEs) in Ipomoea aquatic grown on potted paddy soil fertilized with municipal sludge and chemical fertilizers showed that the total contents of PAEs (∑PAEs) in Ipomoea aquatic aboveground parts ranged from 2.129mg·kg -1 to 7.111 mg·kg -1 ,decreasing in order of Guangzhou sludge + fertilizers (7.111 mg·kg -1 )>Guangzhou sludge (4.767 mg·kg -1 )>Foshan sludge (3.569 mg·kg -1 )>Foshan sludge + fertilizers (3.305 mg·kg -1 )>fertilizers (2.638 mg·kg -1 )>control (2.129 mg·kg -1 ),indicating that compared with control,fertilization increased ∑PAEs in Ipomoea aquatica to a different extent. Only certain compounds of PAEs in different treatments of Ipomoea aquatica were dominant,e.g.,butylbenzyl phthalate(BBP) in control,chemical fertilizers,Foshan sludge,and Guangzhou sludge accounted for 40 % to 80% of ∑PAEs,di-n-butyl phthalate(DnBP) in Foshan sludge + chemical fertilizers accounted for 56%,while di-n-octyl phthalate(DnOP),di(2-ethylhexyl)phthalate(DEHP) and BBP in Guangzhou sludge + chemical fertilizers accounted for approximately 30% . ∑PAEs and the contents of its most compounds were higher in the plants of Ipomoea aquatica than in its roots to a different extent.