Thanks of all suggest for Vitamin D analysis. I have other question for who can help me for analysis of Si 29 , because I have a high background level(>4M counts) and I can't point this contamination. I run same water and standard on ICP4300 without problems at 0.05ppm level detection limit. I changed many parts of sample introduction without success.
Laboratoires d'analyses S.M. inc.
TÚl. +1-514-332-6001 x 5100
[log in to unmask]