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Vol. 25 No. 3
May - June 2003

Making an imPACt | Recent IUPAC technical reports and recommendations that affect the many fields of pure and applied chemistry.
See also www.iupac.org/publications/pac
 

Use of the Term "Recovery" and "Apparent Recovery" in Analytical Procedures (IUPAC Recommendations 2002)

by D. T. Burns, K. Danzer, and A. Townshend

Pure and Applied Chemistry,
Vol. 74, No. 11, pp. 2201—2205 (2002)

For linear calibration graphs c(test) is independent of the slopes a1 or a2. The absolute values of R1 or R2 do not affect the value of c(test) provided that R1e1l and R2e2l are independent of C.

The chemical community has used the term recovery to deal with two quite different experimental configurations. The terms recovery and apparent recovery are recommended to avoid confusion caused by the use of the term recovery to cover two distinct situations. These situations deal with: (a) the yield of a preconcentration or extraction stage of an analytical process (where recovery is recommended) and (b) the quantity observed value/reference value, obtained using an analytical procedure that involves a calibration graph (where apparent recovery is recommended).

www.iupac.org/publications/pac/2002/7411/7411x2201.html


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