Chemische Analysen mit dem Polarographen

Instrumental Methods of Chemical Analysis

“…Tables of data are given in several places {124, 160, 161,196,289) listing half-wave potentials and tangent potentials of organic substances under various condi- tions and in different media. Actual procedures for technical analyses are also available (134) and will suffice in most cases in deciding whether a given determination is feasible. The Sargent bibliography ( 239) is particularly valuable because full titles of all publications to date (1941) are included.…”

La Titolazione Polarografica del Rame nel fegato di Diverse specie Animali

“…L'allontanamento degli ioni ferrici da quelli rameici, per peter determinare polarograficamente questi ultimi, ~ un problema che fu abordato anche da H. Hohn. Questo A. per l'esame polarografico del Cu impiegb come soluzione fondamentale (26) una soluzione di cloruro ammonio al 10% sciolto in ammoniaca 2 N. L'ammoniaca veniva cosl a formare dei sali complessi col C u e d inoltre precipitava il Fe eventualmente presente allo state idrato.…”

Calibrant-Free Analyte Quantitation via a Variable Velocity Flow Cell

“…An alternate calibration scheme to that of the internal standard method is the standard addition method (SAM). The SAM, which results in an absolute concentration determination rather than one that is based on relative responses, is attributed to mining chemist Hans Hohn and is detailed in his 1937 book on polarography, Chemische Analysen mit dem Polarographen . The SAM is generally preferable to the use of calibration curves, especially in cases where the analyte matrix is unknown or difficult to replicate but is not always practical …”

“…The SAM, which results in an absolute concentration determination rather than one that is based on relative responses, is attributed to mining chemist Hans Hohn 13 and is detailed in his 1937 book on polarography, Chemische Analysen mit dem Polarographen. 14 The SAM is generally preferable to the use of calibration curves, especially in cases where the analyte matrix is unknown or difficult to replicate but is not always practical. 15 These three calibration methods address the historical needs of accurate analyte quantitation, but as the benefits of simultaneously monitoring ever increasing numbers of analytes, analyte panels, are contemplated, 16−23 implementation of historical calibration methods becomes more awkward 19 and, in some cases, intractable.…”