通过水热合成法制备磁性类沸石咪唑酯材料（Fe₃O₄@ZIF-8），采用扫描电子显微镜、透射电子显微镜和傅里叶变换红外光谱仪对该材料进行表征。将50 mg Fe₃O₄@ZIF-8加入100 mL水样中，于40℃振荡吸附10 min后，将Fe₃O₄@ZIF-8进行磁分离，弃去水样，加入0.5 mL乙腈，涡旋解吸1 min，将洗脱液转移，重复解吸3次，合并洗脱液，用氮气吹至近干后用甲醇-0.1%（体积分数）甲酸溶液（6+4）混合溶液溶解并定容至500 μL，经0.22 μm有机滤膜过滤，滤液在Agilent Zorbax Eclipse XDB-C₁₈反相色谱柱（50 mm×3 mm，1.8 μm）上分离，以甲醇-0.1%（体积分数）甲酸溶液为流动相进行梯度洗脱，质谱分析中采用电喷雾离子源和多反应监测模式。4种苯脲类除草剂质量浓度均在0.01~20.0 μg·L^-1内与峰面积呈线性关系，检出限（3S/N）为1.03~3.00 ng·L^-1。对空白水样进行加标回收试验，回收率在78.8%~106%之间，相对标准偏差（n=6）小于7.0%。

The magnetic zeolitic imidazole ester material (Fe₃O₄@ZIF-8) was prepared by hydrothermal synthesis method, and was characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared spectrometer. 50 mg of Fe₃O₄@ZIF-8 was added to 100 mL of water sample, and the mixture was shaken at 40℃ for 10 min of adsorption. After Fe₃O₄@ZIF-8 was magnetically separated and the water sample was discarded, 0.5 mL of acetonitrile was added and the mixture was vortexed for 1 min for desportion, the eluate was transferred, and desorption was repeated three times. The combined eluate was dried by nitrogen blowing, the residue was dissolved with a mixed solution of methanol and 0.1% (φ) formic acid solution (6+4), and the volume of the solution was made up to 500 μL. After the solution was filtered through a 0.22 μm organic filter, the filtrate was seperated on an Agilent Zorbax Eclipse XDB-C₁₈ chromatographic column (50 mm×3 mm, 1.8 μm), with a mixture of methanol and 0.1% (φ) formic acid solution as the mobile phase for gradient elution. Electrospray ion source and multi-reaction monitoring mode were selected in mass spectrometry analysis. Linear relationships were found between peak areas of 4 phenylurea herbicides and the corresponding mass concentrations in the same range of 0.01-20.0 μg·L^-1, and the detection limits (3S/N) were in the range of 1.03-3.00 ng·L^-1. Test for recovery was made by standard addition method to blank sample, giving results in the range of 78.8%-106%, with RSDs (n=6) less than 7.0%.