Spectrophotometric determination of anions by solvent extraction with cuproin- or neocuproin-copper(I) chelate cations
1969; Elsevier BV; Volume: 47; Issue: 1 Linguagem: Inglês
10.1016/s0003-2670(01)81812-2
ISSN1873-4324
AutoresYoshinari Yamamoto, Nobuko OKAMOTO, Keyu Tao,
Tópico(s)Chemical Analysis and Environmental Impact
ResumoSpectrophotometric methods are proposed for the determination of anions such as perchlorate, nitrate, phthalate and tetraphenylborate. The methods are based on solvent extraction of the ion pairs formed between colored copper(I) chelate cations and the anions, into organic solvents. Perchlorate or tetraphenylborate is easily extracted with the cuproin-copper(I) chelate into chloroform or chlorobenzene, and nitrate with the neocuproin-copper(I) chelate into methylisobutyl ketone. Eithe system can be used for the determination of phthalate. Potassium can be determined in the range 20–200 μg by means of the tetraphenylborate procedure. Calibration graphs were linear in the range 10-6–10-5M for each anion in aqueous solution. The effects of diverse ions are described; anionic interferences can be largely eliminated by addition of silver(I) or mercury(II) salts.
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