Colorimetric determination of ligands by the effect of their cobalt(II) complexes on redox indicators

A semiquantitative method for the detection of microcapsule residues resulting from microencapsulated pesticide applications

“…techniques have been reported for the analysis of diamines by Combes (1889), Conway (1954), Feigl (1956), Hanker et al (1953), Kolbezen et al (1962), Mclntire et al (1953), Sokolov (1971), Wilson (1935), Keeler (1959), Mark and Schwartz (1963), Delorenzi (1955), and Krynska (1969). These methods, however, do either not yield the desired sensitivity or are not conveniently applicable to our procedure.…”

A fluorometric method for microgram quantities of ethylenediamine residues in milk

“…The direct quantitative measurement of microgram quantities of ethylenediamine, because of the simplicity of the molecule, is a singularly difficult task. The formation of a derivative (3)(4)(5) or condensation product which can be measured by gas chromatography, visible or ultraviolet spectrophotometry, or fluorometry to obtain the required sensitivity was investigated. Combes (2) made ethylenediamine react with acetylacetone and copper acetate and obtained a violet precipitate which could be partitioned into chloroform.…”