标准偏差

1.The content of free acetic acid in cigarette smoke condensates was determined by GC-MS with isopropyl alcohol as the solvent and nonanol as the internal standard.

以异丙醇为溶剂,壬醇为内,采用气色谱-质谱法分析了卷烟烟气总粒物中的游离乙酸,乙酸测定结果的准差1%,均回收率为99。

2.The standard deviations were 0.06 and 0.14 for Phoxim and Quintozene repectively,while the coefficients of variation were 1.14% and 1.34%.The average recoveries were 99.5 and 99.2% separately.

辛硫磷和五氯硝基苯准差分别为0.06和0.14,变异系数分别为1.14%和1.34%,均回收率分别为99.5%和99.2%。