A novel silicone phthalocyanine for the preconcentration and spectrophotometric determination of copper by ionic liquid-based dispersive liquid-liquid microextraction

Year 2019, Volume: 1 Issue: 1, - , 11.12.2019

Yasemin Çağlar Ece Tugba Saka

Abstract

Dispersive
liquid-liquid microextraction (DLLME) has become a very popular environmentally
benign sample preparation technique, due to its simplicity, speed of operation
and low consumption of solvent and reagent. It has attracted much interest from
scientists working in separation science, and much improvement has been made since
its introduction in 2006. This work reports the development of a new simple ionic
liquid based dispersive liquid-liquid microextraction (IL-DLLME) method for
spectrophotometric copper determination. First, the copper was complexed with a
novel silicone phthalocyanine and than the complex was extracted into 1-heptyl-3-methylimidazolium
hexafluorophosphate dissolving in acetone
in the presence of sodium dodecyl sulphate (SDS) as the anti-sticking agent.
After centrifuging for 2 min at 3000 rpm, the extracting phase was diluted to
250 µL with acetone for spectrophtometric detection at 340 nm. Some experimental
conditions that influence the procedure were optimized. The pH and complexing
reagent concentration are 4.0 and 4.6x10^-6 molL^-1,
respectively. The method is linear in the range from 0.03 to 100 µg/mL
with a correlation coefficient (R²) of 0.9973. The limit of
detection (LOD) of method is 0.017 µg/mL. The relative
standard deviation is 1.7% at 45 µg/mL Cu²⁺ (n=6).  The enrichment factor for the method was
calculated as 210.

Keywords

Dispersive liquid-liquid microextraction; Silicone phthalocyanine; Cu preconcentration; Ionic liquids; Spectrophotometry.

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