1、齐升达Analytical Chemistry is a scientific discipline that develops and applies methods,instruments and strategies to obtain information on the composition and nature of matter in space and time.(R.Kellner,etc.,Analytical Chemistry,1998)5124361.2定量分析过程定量分析过程仪器分析法仪器分析法含量相对低含量相对低时：时：以以ppm或或ppb表示表示610)()(
2、)()()(-SBSBgmgmgmgmppmx1 ppm：106分重的试样中含一分重的试样中含一分重的被测组分分重的被测组分 1、固体样品、固体样品SBB/mmw 质量分数质量分数%gmgm%xSB100)()()(百分含量百分含量 910)()()()()(-SBSBgmgmgmngmppbx1 ppb：109分重的试样中含一分重的试样中含一分重的被测组分分重的被测组分 例：分析某天然水试样，每升水中含例：分析某天然水试样，每升水中含Na+0.120 g，F-0.80 mg，Hg2+50 g则则 50ppbg/L50Hg2的含量120ppm1L120mg1L120g.0Na的含量80ppm.0L/80mg.0F的含量mMLmolLmolggNaC22.5/1022.51/23120.0)(3
