建立了水中2,4-二氯苯氧乙酸(2,4-D)、萘乙酸(NAA)和6-芐基腺嘌呤(6-BA)3种植物生长调节剂残留分析的高效液相色谱方法.采用溶剂热还原法,以乙二醇和FeCl3·6H2O作原料,合成出形貌均一、分散性好、稳定性佳的磁性Fe3O4亚微米球,作为固相萃取材料,以静电吸附作用可以富集水中残留的2,4-D、NAA、6-BA 3种植物生长调节剂.水样经调节pH值和固相萃取净化后,高效液相色谱法测定.3种植物生长调节剂在0.1 ～10 mg/L范围内响应和浓度的线性关系良好,相关系数均大于0.999；2,4-D、NAA、6-BA的检测限分别为0.06、0.02、0.04 mg/L.在测定的自来水、河水和湖水3种水样中,添加回收率范围为73.20％ ～87.21％,相对标准偏差为1.11％ ～7.52％(n=3),为水中的2,4-D、NAA和6-BA残留监控提供了简单、快速、准确的测定方法.%A method based on solid-phase extraction using sub-microspheres magnetite(Fe3O4) as adsorbent was developed for the determination of three plant growth regulators residues from water samples by high performance liquid chromatography. Monodispersed sub-microspheres magnetite (Fe04) was synthesized by a solvothermal reduction method using ethylene glycol and FeCl3·6H2O as the raw materials. After adjusting the pH value,the water samples were cleaned up with solid phase extraction. Good linearities (r2>0. 999) for three plant growth regulators residues were obtained. The limits of detection for2,4-D,NAA,6-BA were 0. 06,0. 02,0.04 mg/L, respectively. The recoveries of these compounds from three spiked water samples ranged from 85. 3 to 96. 1 % ,with RSDs less than 7. 52%. The method was sensitive and simple,and was suitable for monitoring of 2,4-D., NAA ,6-BA in water.
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