scholarly journals Cloud Point Extraction for the Determination of Different Metal Ions by Using Bis(2-Acetyl Pyridine 4-Phenyl 3-Thiosemicarbazone) as Complexing Reagent

2019 ◽  
Vol 62 (2) ◽  
pp. 76-81
Author(s):  
Ambreen Shah ◽  
Fayyaz Ahmed Keerio ◽  
Saima Qayyum Memon ◽  
Ghulam Zuhra Memon
Keyword(s):  
Metal Ions ◽  
Cloud Point ◽  
Cloud Point Extraction ◽  
Sodium Dodecyl ◽  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Micellar Phase ◽  
Flame Atomic Absorption ◽  
Effects Of Ph

A new method of cloud point extraction was determined for preconcentration and determination of different metal ions like copper(II), nickel(II) and cobalt(II) ions. The complexation has been done by bis(2-acetyl pyridine 4-phenyl 3-thiosemicarbazone) (APPT) using sodium dodecyl sulphate (SDS) as surfactant. Metal ions are extracted into the phase rich in SDS after centrifugation. Initially, micellar phase was dissolved in 10 mL of deionized water then acidified with 0.5 mol/L HNO3, enhanced the surfactant- rich phase and analyzed by flame atomic absorption spectrometry (FAAS). The effects of pH, the concen- trations of metal ions and chelating agent (APPT), volume of surfactant (SDS), equilibration temperature and time were studied on CPE. The preconcentration factor obtained was 25 and the limits of detection(DL) obtained for cobalt(II), nickel(II) and copper(II) were 1.5, 1.7 and 2.4 ng/mL, respectively. This method of preconcentration was effectively useful for the determination of cobalt(II), nickel(II) and copper(II) in water samples.

scholarly journals Synthesis and Application of a New Thiazolylazo Reagent for Cloud Point Extraction and Determination of Cobalt in Pharmaceutical Preparations

2011 ◽  
Vol 94 (4) ◽  
pp. 1304-1309 ◽  
Author(s):  
Regina Terumi Yamaki ◽  
Luana Sena Nunes ◽  
Hygor Rodrigues De Oliveira ◽  
André S Araújo ◽  
Marcos Almeida Bezerra ◽  
...  
Keyword(s):  
Cloud Point ◽  
Inductively Coupled Plasma ◽  
Cloud Point Extraction ◽  
Pharmaceutical Preparation ◽  
Pharmaceutical Preparations ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Preconcentration Procedure ◽  
Flame Atomic Absorption

Abstract The synthesis and characterization of the reagent 2-(5-bromothiazolylazo)-4-chlorophenol and its application in the development of a preconcentration procedure for cobalt determination using flame atomic absorption spectrometry after cloud point extraction is presented. This procedure is based on cobalt complexing and entrapment of the metal chelates into micelles of a surfactant-rich phase of Triton X-114. The preconcentration procedure was optimized by using a response surface methodology through the application of the Box-Behnken matrix. Under optimum conditions, the procedure determined the presence of cobalt with an LOD of 2.8 μg/L and LOQ of 9.3 μg/L. The enrichment factor obtained was 25. The precision was evaluated as the RSD, which was 5.5% for 10 μg/L cobalt and 6.9% for 30 μg/L. The accuracy of the procedure was assessed by comparing the results with those found using inductively coupled plasma-optical emission spectrometry. After validation, the procedure was applied to the determination of cobalt in pharmaceutical preparation samples containing cobalamin (vitamin B12).

Sign in / Sign up

Export Citation Format

Share Document