A SIMPLE SPECTROPHOTOMETRIC METHOD FOR THE TRACE DETERMINATION OF COPPER(II)
| Autor: | Ramana Kumar Kakarla, Srilalitha Vinnakota, Raghavendra Guru Prasad Aluru, Rao Krishna Rao Ravindranath Lakshmana |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Periódico Tchê Química. :50-56 |
| ISSN: | 2179-0302 1806-0374 |
| DOI: | 10.52571/ptq.v9.n18.2012.50_periodico18_pgs_50_56.pdf |
| Popis: | Copper is an essential trace nutrient for plants, animals. It is very essential at lower levels for specific metabolic functions, but is harmful at elevated levels. Significant amount of copper is widespread in the environment form variety of sources. A simple spectrophotometric method is presented for the determination of trace amounts of copper using salicyl salicyclic acid hydrazone (SSAH) as a spectrophotometric reagent. The proposed method has the advantages of sensitivity, rapidity and selectivity without any prior separation or extraction. The method was based on the reaction between SSAH and Cu(II) in acidic medium to produce a greenish-yellow colored complex. The complex has an absorption maximum at 420 nm. Beer’s law is obayed in the concentration range 0.2497 to 2.2471 μg mL−1. Several parameters like stability constant (1.13×107), molar absorption coefficient (8.560×104 L mol–1cm–1), Sandell’s sensitivity (0.0007 μg cm–2), linear calibration range, stoichiometry of the complex (1:1), method detection limit (0.0299 μg mL–1), limit of quantification (0.0598 μg mL–1), standard deviation (2.624%–3.567%) etc were calculated and presented. The effect of foreign ions on the determination was presented. The method was successfully applied for the determination of copper in spiked water samples and alloy samples. |
| Databáze: | OpenAIRE |
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