Herbert A. Laitinen

Study of the Sorption of Lead by Hydrous Ferric Oxide

Abstract Sorption of lead on synthetic hydrous ferric oxide (HFO) as a function of lead concentration and pH has been investigated. As much as 0.28 moles lead per mole iron as HFO was found to be sorbed at pH 6. The sorption involves release of hydrogen ions from HFO and the process is reversible with respect to hydrogen ions. The ratio of the moles of H+ released per mole of lead sorbed was found to decrease from 1.59 at pH 6 to 1.18 at pH 5. The environmental consequences of the reversible lead sorption with pH are discussed. The clay fractions (<μ particle size) of soils and sediments are known to carry appreciable amounts of the hydrous oxides of iron and manganese (1). These hydrous oxides, amorphous in nature, have very high sorption capacity for certain heavy metal ions comparable to that of clays (2) and play a significant role in affecting the heavy metal ion concentrations in their surroundings. The behavior of hydrous oxides towards heavy metal ions and other cations has been the subject of lar...

A study of the electro reduction of metaphosphate in molten LiCl-KCl eutectic

Abstract The reduction of trimetaphosphate in LiCl-KCl eutectic has been studied over the temperature range 450–700° using voltammetry, chronopotentiometry, and coulometry. The reduction process was observed to be very complex even at the highest temperatures because of prior chemical reactions. A reduction scheme is proposed that is consistent with experimental observations.

Classification et nomenclature des méthodes électrochimiques d'analyse

Resume Une classification et une nomenclature rationnelles des methodes electrochimiques danalyse sont discutees a lexclusion des methodes basees sur les phenomenes electrocinetiques. Tres peu de termes nouveaux sont introduits et il est recommande dabandonner quelques termes utilises quelquefois.

Study of the Interaction of Lead with Corn Root Exudate—A Pulse Polarographic Study

Abstract The ability of corn root exudate to complex metal ions, in particular lead, has been investigated. It was found that exudate solubilizes lead present in different forms in the solid phase. Zn++ was found to compete moderately with Pb++ for exudate ligands while K+, Ca++ and Mg++ showed little competition. The importance of the complexing property of exudate in soil-water-plant relationships is discussed.