Morrica Patrizia, Fidente Paola, Seccia Serenella, Ventriglia Mariacarla
Dipartimento di Chimica Farmaceutica e Tossicologica, Università di Napoli Federico II, Via D. Montesano 49, Italia.
Biomed Chromatogr. 2002 Dec;16(8):489-94. doi: 10.1002/bmc.184.
Imazosulfuron, 1-(2-chloroimidazo [1,2-a] pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)urea, is a new sulfonylurea herbicide applied once per growing season. It is highly active at low application levels and is used to control most annual and perennial broad-leaf weeds and some grasses in cereal crop. In this work the degradation of imazosulfuron in four different soils was investigated under aerobic laboratory conditions to evaluate its environmental fate. Test soils were treated with this herbicide in acetonitrile to obtain a final concentration of 0.2 mg kg(-1) (100 g ha(-1)), extracted with methylene chloride and analyzed by reversed-phase liquid chromatography (RP-HPLC) using a C(18) column coupled with UV detection. Recoveries of spiked soils ranged from 84.3 to 99.8% (RDS 0.0-4.9%; n = 4). The limits of quantitation ranged from 0.002 to 0.004 mg kg(-1). Imazosulfuron half-life, t(1/2), was calculated in each of the investigated soil. In aerobic conditions it ranged between 1 and 50 days.
咪唑磺隆，即1-(2-氯咪唑并[1,2-a]吡啶-3-基磺酰基)-3-(4,6-二甲氧基嘧啶-2-基)脲，是一种每个生长季节施用一次的新型磺酰脲类除草剂。它在低施用量下具有高活性，用于防治谷类作物中的大多数一年生和多年生阔叶杂草以及一些禾本科杂草。在本研究中，在有氧实验室条件下研究了咪唑磺隆在四种不同土壤中的降解情况，以评估其环境归宿。用乙腈将该除草剂处理试验土壤，使其最终浓度达到0.2 mg kg(-1)(100 g ha(-1))，用二氯甲烷萃取，并用配备紫外检测的C(18)柱通过反相液相色谱法(RP-HPLC)进行分析。加标土壤的回收率在84.3%至99.8%之间(RSD为0.0 - 4.9%；n = 4)。定量限在0.002至0.004 mg kg(-1)之间。在每种被研究的土壤中计算了咪唑磺隆的半衰期t(1/2)。在有氧条件下，其范围为1至50天。
