C OLORIMETRIC ANALYSIS has been employed extensively in determination of copper and zinc in human serum and other biologic materials. Greenleaf (1) and Callan and Henderson (2) determined copper colorimetrically using dithizone and diethyldithiocarbamate, respectivelv. Zinc was determined colorinietricallv by Fischer and Leopoldi (4) and by Wolf (5), using dithizone. These procedures were evalu...

An ultraviolet spectrophotometric procedure has been developed for the measurement of serum nickel. Samples of serum are lyophilized and the dry residues are subjected to acid digestion. Nickel is separated from interfering elements by chloroform extraction of nickel dimethylglyoximate at alkaline pH. Nickel is converted to the diethyldithiocarbamate complex and is extracted with isoamyl alcoho...

The objective of this work is to track the amount of metal complexes distributed in the extraction cell, collection vial, and tubing used in supercritical fluid extraction (SFE) systems after progressive removal of metal ions in supercritical carbon dioxide (SC-CO2). Sodium diethyldithiocarbamate (NaDDC) and dibutylammonium dibutyldithiocarbamate (DBDC) ligands were used to form complexes with ...