|MadSci Network: Chemistry|
Hi Becky, I have to admit that I cheated somewhat on this one and made contact with a friend who lectures Chemistry in NZ. His thoughts are that you would most likely be best off using Atomic Absoption (AA) Spectroscopy. The response to your solution (lotion) is compared with a set of standards you make up which contain a known concentration of the metal chosen. Check out http://www .gmu.edu/departments/SRIF/tutorial/aas/aas.htm for more info. As for sample preparation you may not need to do anything to the lotion. If you must dilute to get it to a workable liquid state then you can add dionised water and then just remember to calculate back to your original concentration (C1V1 = C2V2). Hope that all makes sense. Peter
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