提出了高效液相色谱法测定联苯菊酯悬浮剂中联苯菊酯含量的方法。样品用甲醇超声提取20 min,分取部分提取液用流动相溶液,即甲醇与水(87+13)的混合溶液定容为100 mL。用针头过滤器净化并取出此溶液,通过Agilent Eclipse XDB-C18色谱柱,并用上述流动相溶液进行分离,流量为1.4 mL·min-1,于206 nm波长处用二极管阵列检测器检测。联苯菊酯的质量浓度在3.0~50.0 mg·L-1范围内与其峰面积呈线性关系,方法的检出限(3S/N)为0.67 mg·L-1。在11.1,15.5,24.4 mg·L-1三个添加水平下,回收率在99.2%~104.5%之间,相对标准偏差(n=6)在0.8%~2.9%之间。

HPLC was applied to the determination of content of bifenthrin in its product of suspension. The sample was extracted with methanol ultrasonically for 20 min. An aliquot of the extract was diluted to 100.0 mL with the mobile phase solution, i.e. a mixture of methanol and water (87+13). A portion of the solution, taking with a filtering injector for purification, was introduced into the instrument and separated on Agilent Eclipse XDB C18 column with the mobile phase solution as eluant at the flow-rate of 1.4 mL·min-1. Diode array detector at the wavelength of 206 nm was adopted in the determination. Linear relationship between values of peak area and mass concentration of bifenthrin was kept in the range of 3.0-50.0 mg·L-1, with detection limit (3S/N) 0.67 mg·L-1. Tests for precision and accuracy were carried out at three concentration levels of 11.1, 15.5, 24.4 mg·L-1, giving values of recovery and RSD′s (n=6) in the ranges of 99.2%-104.5% and 0.8%-2.9% respectively.