Trace mercury in wate were measured by dispersion-liquid microextraction combined with spectrophotometry

Abstract

An experimental method was developed for the determination of trace amounts of mercury by dispersion-liquid microextraction combined with spectrophotometry. Undea buffer medium of hydrochloric acid and sodium acetate at pH=4, mrcury ions in the water were extracted by dispersion-liquid microextraction at the wavelength of 410nm, carbon tetrachloride was used as an extractant, methanol was used as a dispersant, dithizone-methanol solution was used as a chelating agent, the optimum conditions for extraction were obtained, Carbon tetrachloride 70uL, methanol 0.75mL, dithizone methanol solution 200uL. Under the optimal conditions, Lambert-Beer's law was satisfied at concentrations of 0.1-20μg/L,the detection limit is 64.2ng /L, The correlation coefficient of the standard curve was R2 =0.9983, the relative deviation was about 4.64%. Three water samples were measured, the recoveries were 96.8%-109.2%.