STUDY OF THE BEHAVIOR OF THE ABSORBENT BLANKS IN ANALYTICAL PROCEDURES BY USING THE H-POINT STANDARD ADDITIONS METHOD (HPSAM)

This paper studies the behaviour of reagent blank in different extract ive-colorimetric procedures (determination of sympathomimetic amines w ith NQS reagent) by using the H-Point Standard Additions Method (HPSAM ) in order to study and characterize the different possibilities that the blank can introduce in an analytical procedure. We define two kind s of blanks: the external blank (from reagent alone solutions data) an d the internal blank (from extrapolation of reagent plus analyte solut ions data). Comparison between both gives the information about the re producibility of the behaviour of the reagent blank. A procedure to ev aluate, and characterize, errors (if they exist) is described, and a g uide for optimizing the measuring procedure is presented.