On using perkin elmer ICP-MS. The lead in food is analysed with two modes , the standard mode and helium mode . But the result was totally different as it was much lower in helium mode. So what result we can report and how we be confirmed ??
Obtain a food product with a certified content of lead, a so called Certified Reference Material. Measure the lead content in the CRM in both modes and decide which mode is the best.
It might be that both results are widely deviating from the certified content, then you have to adapt/improve your analytical method.
Usually lead is analyse in standard mode. Helium mode is mainly for '"problem" elements (K, Fe, Ca, P, Si). You can make a Pb spike in to original sample and then analyse Pb. It is more simply way as compared to applicable CRM obtaining.
I would always advocate the use of a CRM or participation in a collaborative testing program to ensure the quality and accuracy of any analytical method.
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