Injection-ultrasound-assisted-DLLME UV-Visible spectrophotometry of ultra-trace copper
What is it about?
The proposed method uses sodium diethyl-dithiocarbamate as a complexing agent, carbon tetrachloride as an extractent. Extraction and reaction conditions were optimized. A linear calibration curve was obtained with an large enrichment factor. The method is organic solvents-minimizing. It was applied successfully to the determination of copper in tap water, river water and bottled pure water.
Why is it important?
Microporous plastic tip was first used in dispersive liquid–liquid microextraction, which could avoid metallic contamination. Measurement of turbidity, rather than optical microscopic photography, was used to assess more easily and precisely the dispersion degrees of cloudy solutions of DLLME. It may attract the attentions of analytical chemists, environmental chemists and analytical instrument manufacturers, so on.
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