Re: Need to find lab procedure for selenium analysis in shampoo

Dear Anna,
the method of choice might well be Atomic Absorption Spectroscopy, which 
(generally) allows determination of as little as 0.02 ng/mL (reference: 
Applied Spectroscopy volume 37  1983  page 411).  By creating a standard 
calibration curve, you should be able to determine concentration in 
shampoo samples.  You can find the basics of analytical atomic absorption 
calibration curve/unknown concentration determination in any Instrumental 
Analysis text (I can recommend a few).  A little research in such texts at 
a University library may well uncover a procedure.


Feel free to email me at weibelm@battelle.org if you have further 
questions.

Good Luck
Mike