I have a question regarding the calculation of “heavy metals (by ICP-OES)” as described in the 11th edition of “ACS Reagent Chemicals”. Page 79 describes how the ICP-OES should be calibrated and how sample preparation and measurement have to be performed. The first section on page 80 describes how the spike recovery has to be calculated as well as the detection limit. The section “Calculation of Heavy Metals (by ICP-OES) Result” simply says that the result is the summation of all concentrations of the targeted elements.
For a material of high purity I would expect that all or many concentrations measured are below the calculated detection limit. However the word “detection limit” does not exist in this section. How shall we deal with situation?
I understand that a ACS Analytical Reagents representative has separately responded to Holger Schmidt and has satisfactorily responded to the question.