Research Article
Cloud Point Extraction for the Determination of Trace Amounts of Cobalt in Water and Food Samples by Flame Atomic Absorption Spectrometry
Table 4
Procedure using cloud point extraction prior to cobalt determination by FAAS.
| Reagent | Surfactant | Sample volume/mL | EFa | LODb/(μg L−1) | Reference |
| Ammonium pyrrolidine dithiocarbamate | Triton X-114 | 10 | 20 | 5 | [14] | 1-(2-Thiazolylazo)-2-naphthol | Triton X-114 | 50 | 57 | 0.24 | [15] | 1-(2-Pyridylazo)-2-naphthol | Triton X-114 | 10 | 115 | 0.38 | [16] | 2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol | Triton X-100 | 12.5 | 28.5 | 1.06 | [17] | 1-nitroso-2-naphthol | PONPE 7.5 | 10 | 27 | 1.22 | [18] | 2-[2′-(6-Methyl-benzothiazolylazo)]-4-bromophenol | Triton X-114 | 10 | 28 | 0.9 | [19] | Methyl-2-pyridylketone oxime | Triton X-114 | 15 | 67 | 2.1 | [20] | 2-[(2-Mercaptophenylimino)methl]phenol | Triton X-114 | 25 | 97 | 0.21 | [21] | 2-guanidinobenzimidazole | Triton X-114 | 50 | 13 | 7.8 | [22] | 1-Phenylthiosemicarbazide | Triton X-114 | 50 | 25 | 1 | [23] | 4-Methoxy-2-sulfo-benzenediazoaminoazo-benzene | Triton X-114 | 15 | 19 | 0.47 | This work |
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