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- W2018021004 abstract "A simple and highly sensitive extraction—spectrophotometric determination of copper (II) is described. The ion-associate formed between the copper(II)—4-(2-pyridylazo)-resorcinol (PAR) anion and tetradecyldimethylbenzylammonium chloride (TDBA) is extracted with chloroform at pH 9.7. The absorption maximum of the extracted species occurs at 510 nm, the molar absorptivity being 8.05 (± 0.07) × 104 l mol-1 cm-1. Beer's Law is obeyed in the concentration range 0.1–0.5 μg Cu ml-1. The composition of the ion-associate is estimated to be [Cu(PAR)2(TDBA)2]. The conditional extraction constant is log K'ex ≈ 8. The interference of some cations and anions is studied. The method is suitable for analysis of waters." @default.
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- W2018021004 date "1982-06-01" @default.
- W2018021004 modified "2023-10-18" @default.
- W2018021004 title "Extraction—spectrophotometric determination of copper(II) with 4-(2-pyridylazo)resorcinol and a long-chain quaternary ammonium salt" @default.
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- W2018021004 doi "https://doi.org/10.1016/s0003-2670(01)85316-2" @default.
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