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A silver particles impregnated onto natural phosphate (Ag/NP) was synthesized using reaction in solid state. The obtained powder was characterized by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The (Ag/NP) was used as modifier of carbon paste electrode (CPE) to determine mercury by square wave voltammetry. The calibration graph obtained is linear from 1.0×10−8mol·L−1 to 1.0×10−5mol·L−1 at preconcentration time of 5min, percentage loading of 7%, with correlation coefficient of 0.993. The limits of detection (DL,3σ) and quantification (QL,10σ) were 5.8×10−9mol·L−1 and 19.56×10−9mol·L−1 respectively. The repeatability of the method expressed as relative standard deviation (R.S.D.) is 2.1% (n=8). The proposed method was successfully applied to determine mercury(II) in aquatic algae and seawater samples

Effect of natural phosphate to remove silver interference in the detection of mercury(II) in aquatic algae and seawater samples