Abstract：A new determination method of trace copper in water by dispersive liquid phase microextraction combined with spectrophotometry was established with chloroform as extraction agent, methanol as dispersant and copper reagent (sodium diethyldithiocarbamate) as chelating agent. Certain amount of Cu2+ standard solution and 50 μL of 1.0 g/L copper reagent solution were added into 50 mL centrifuge tube. After dilution with water to about 50 mL, the pH of solution was adjusted to 3.0 with 1 mol/L hydrochloric acid. Then, the solution was diluted to the mark. After that, 3.25 mL of mixture composed by chloroform and methanol with volume ratio of 3∶10 was rapidly added into the centrifuge tube above to form uniformly turbid phase. After extraction for 4 min, the solution was centrifugally separated at 3 000 r/min for 2 min. The extract at lower layer was sampled into 1 cm micro quartz colorimetric utensil. The absorbance was measured at 440 nm with blank reagent as reference. The results showed that the mass concentration of copper in range of 0.5-10 μg/L had good linear relationship with its corresponding absorbance. The correlation coefficient was 0.993 9. The detection limit of method was 0.069 μg/L. The proposed method was applied to the determination of trace copper in water sample, and the results were basically consistent with those obtained by flame atomic absorption spectrometry (FAAS). The relative standard deviations (RSD, n=5) were between 3.1% and 4.0%.
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