M ethods Samples were extracted by methylene chloride, dehydrate by anhydrous sodium sulfate, determinate by GC-MSR.esults The method is simple, efficient, rapid, accurate and sensitive.

• 方法样品用二氯甲烷萃取,无水硫酸钠脱水,气质联用法检测。结果方法简便、高效、快速、准确、灵敏度高。