Sürme, YavuzYıldırım, Gizem KahveUçan, MustafaNarin, İbrahim2024-11-072024-11-0720242564-6605https://doi.org/10.28948/ngumuh.1441334https://search.trdizin.gov.tr/tr/yayin/detay/1249724https://hdl.handle.net/11480/12566A flame atomic absorption spectrophotometric technique was studied for the preconcentration and determination of Co2+ ions in trace amounts after ultrasound enhanced enrichment of its 1-(2-pyridylazo)-2-naphthol (PAN) complexes by cloud point extraction. The Co2+ ions were firstly complexed with PAN molecules at pH 4 and the complex transferred to a surfactant Tergitol NP-7 (TNP-7) rich phase with a very small volume under ultrasound waves. The surfactant rich phase was separated and dissolved by 1 mL, 1.0 M HNO3 in ethanol prior to determination of Co2+ concentration by flame atomic absorption spectrophotometry. The optimization steps of ultrasound interaction time, solution pH and surfactant volumes were achieved by response surface methodology (RSM) which is a combination of statistical approaches. PAN concentration and possible interfering ions were optimized conventionally. The Co2+ ions were extracted only in 150 s at pH 4 quantitatively under optimum conditions (?95%). The accuracy and validity of developed ultrasound assisted cloud point extraction (UA-CPE) was granted by employing a certified reference material wastewater UME CRM 1204. The technique was applied to wastewater and natural water with satisfactory results.eninfo:eu-repo/semantics/openAccessKimyaAnalitikKimyaUygulamalıKimyaTıbbiÇevre BilimleriTıbbi Laboratuar TeknolojisiPANResponse surface methodologyUltrasoundNon-heated cloud point extractionFlame atomic absorption spectroscopyArticle13379980510.28948/ngumuh.14413341249724