原文由 lichunhong84 发表:
有时,重金属样品处理好后,当天来不及进样。我把样品放置冰箱,第二天再进样,这样做样品含量会不会偏低。
以下為引自玩具重金屬測試標準(EN71-3標準)中:樣辦制備的要求.
If the resulting solutions are to be kept for more than the working day prior to analysis they shall be stabilized by addition of hydrochloric acid so that the concentration of the stored solution is approximately c(HCl) = 1 mol/l.
所以為避免麻煩,會在24小時內測試.