I. INTRODUCTION The rapid and continuous progress in trace analysis is associated with the development of several new techniques and industries, the beginnings of which date back to the years following World War II. Their demands for high purity materials are the main driving force, although the idea of microelements has been known for a long time in biological, agrotechnical, and geological studies, as well as in forensic analysis. Trace analysis is also an excellent analytical tool in the food industry and in environmental pollution and archeological research. As recognized recently, trace amounts of many metals and nonmetals are essential for normal biological processes. On the other hand, some elements are toxic if present in too high concentrations. With so many fields of interest and application, trace analysis has become now the major problem of the day in analytical chemistry.

Spectrophotometric Determination of Trace Elements

Differential determination of tellurium(IV) and tellurium(VI) with sodium diethyldithiocarbamate, ammonium pyrrolidinedithiocarbamate and dithizone by atomic-absorption spectrophotometry with a carbon-tube atomizer.

An examination of chlorpromazine hydrochloride as indicator and spectrophotometric reagent for the determination of molybdenum(V)

Atomic absorption spectrometric determination of some elements forming volatile hydrides with a heated cell atomizer and gas handling system

L.P. Greenland

Papers

Rapid determination of nanogram amounts of tellurium in silicate rocks

Spectrophotometric determination of molybdenum in rocks with thiocyanate

A solvent extraction study of molybdenum chloride and molybdenum thiocyanate complexes

Extraction spectrophotometric determination of niobium in rocks with sulfochlorophenol S