GÜLER SOMER, A. CENGİZ ÇALIŞKAN, OLCAY ŞENDİL

A new and simple procedure for the trace determination of mercury using differential pulse polarography and application to a salt lake sample

A new and simple differential pulse polarographic procedure was established for the trace determination of mercury(II). An indirect method had to be used since no polarographic peak can be observed for its direct determination. According to their standard potentials, the reaction between SO$_{3}^{2-}$ and Hg(II) was suitable. The peak height of sulfite at about -0.70 V (pH 6, 7) was sharp, high, and very reproducible, enabling the accurate determination of low concentrations of Hg(II). It was found that sulfite concentration had to be 3 times larger than mercury at pH 6, in order to have a quantitative reaction.

Anahtar Kelimeler:

The procedure is simple: to a known amount of sulfite in the polarographic cell (HAc, pH 6 or 7) is added an unknown Hg(II) sample. The Hg(II) concentration is calculated simply from the decrease in the sulfite peak after reaction with Hg(II). The limit

A new and simple procedure for the trace determination of mercury using differential pulse polarography and application to a salt lake sample

Keywords:

The procedure is simple: to a known amount of sulfite in the polarographic cell (HAc, pH 6 or 7) is added an unknown Hg(II) sample. The Hg(II) concentration is calculated simply from the decrease in the sulfite peak after reaction with Hg(II). The limit,

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calomel electrode (SCE), separated by a liquid junction, was used in the three-electrode configuration. The counter electrode was platinum wire. The polarograms were recorded with a Linseis (LY 1600) X–Y recorder under the conditions of a drop life of 1 s, a scan rate of 2–5 mV s −1 , and pulse amplitude of 50 mV. Reagents
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