US EPA

1228650 

Journal Article 

Determination of copper in water samples by atomic absorption spectrometry after cloud point extraction 

Lemos, VA; Santos; dos Santos, MJS; Vieira; Novaes, CG 

2007 

1 

Microchimica Acta
ISSN: 0026-3672
EISSN: 1436-5073 

157 

3-4 (Mar 2007) 

215-222 

Cloud point extraction employing the new reagent 6-[2'-(6'-methyl-benzothiazolylazo)]-1,2-dihydroxy-3,5-benzenedisu lfonic acid as complexing agent and Triton X-114 as the surfactant is proposed for copper determination. A sample volume of 10 mL was used. Dilution of the surfactant-rich phase with acidified methanol was performed after phase separation, and the copper contents were measured by flame atomic absorption spectrometry. Variables affecting the system were optimized using factorial design and Doehlert matrix. Signals were measured as peak height using an instrument software. Using the experimental conditions defined in the optimization, the method allowed copper determination with a detection limit of 1.5 mu g L super(-1). The calculated enrichment factor is 14. The effects of foreign ions are reported. The accuracy of the procedure was tested by analyzing certified reference material. The method was successfully applied to copper determination in natural and drinking water samples. 

Ions; Detection Limits; Clouds; Water sampling; Copper; Absorption spectroscopy; Absorption; Water analysis; Spectral Analysis; Drinking water; Methodology; Freshwater; Computer programs; Surfactants; Analytical techniques; Spectrometry; Acidification; Enrichment