油和脂肪的折射率

油和脂肪

奶油折光仪测量法

              在低下的棱镜表面滴2－3滴经过滤的样品。闭合棱镜，调节反光镜直到获得一敏锐的读数。如果在恒温水通过仪器一段时间以后仍不能获得一确切的读数，说明样品在棱镜上分布不均。当n值受温度影响很大时，应仔细控制，使温度恒定。用随仪器而配的标准液体仔细调节仪器。按表27-2将仪器所得读数转换为n。$$$T表27-2 奶油折射仪读数与折射率换算表$$读数/折射率$$40.0/1.4524$$40.5/1.4527$$41.0/1.4531$$41.5/1.4534$$42.0/ 1.4538$$42.5/1.4541$$43.0/1.4545$$43.5/1.4548$$44.0/1.4552$$44.5/1.4555$$45.0/1.4558$$45.5/1.4562$$46.0/1.4565$$46.5/1.4569$$47.0/1.4572$$47.5/1.4576$$48.0/1.4579$$48.5/1.4583$$49.0/1.4586$$49.5/1.4590$$50.0/1.4593$$50.5/1.4596$$51.0/1.4600$$51.5/1.4603$$52.0/1.4607$$52.5/1.4610$$53.0/1.4613$$53.5/1.4616$$54.0/1.4619$$54.5/1.4623$$55.0/1.4626$$55.5/1.4629$$56.0/1.4633$$56.5/1.4636$$57.0/1.4639$$57.5/1.4642$$58.0/1.4646$$58.5/1.4649$$59.0/1.4652$$59.5/1.4656$$60.0/1.4659$$60.5/1.4662$$61.0/1.4665$$61.5/1.4668$$62.0/1.4672$$62.5/1.4675$$63.0/1.4678$$63.5/1.4681$$64.0/1.4685$$64.5/1.4688$$65.0/1.4691$$65.5/1.4694$$66.0/1.4697$$66.5/1.4700$$67.0/1.4704$$67.5/1.4707$$68.0/1.4710$$68.5/1.4713$$69.0/1.4717$$69.5/1.4720$$70.0/1.4723$$70.5/1