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Potentiodynamic Corrosion Testing

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Interference between selenium and some trace elements during polarographic studies and its elimination.

Güler Somer¹, Ummihan Taşkoparan Yılmaz

¹Gazi Universitesi, Fen-Edebiyat Fakültesi, Kimya Bölümü, 06500 Ankara, Turkey.

|October 31, 2008

Summary

Selenite interferes with heavy metal detection using differential pulse voltammetry (DPV). However, at pH 8.5 with excess selenite, this interference is eliminated, enabling accurate analysis of copper, lead, cadmium, and zinc.

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Area of Science:

Analytical Chemistry
Electrochemistry
Environmental Science

Background:

Selenite is known to interfere with the differential pulse voltammetry (DPV) analysis of various metal ions.
This interference can lead to significant errors (over 50%) in quantitative analysis, especially when metal ions and selenite are present in similar concentrations.
Observed interference across various acidic conditions and pH ranges.

Purpose of the Study:

To investigate the interference of selenite on the DPV analysis of copper, lead, cadmium, zinc, chromium, and arsenic.
To identify conditions under which selenite interference can be mitigated or eliminated.
To establish detection limits for target analytes in the presence of selenite under optimized conditions.

Main Methods:

Differential Pulse Voltammetry (DPV) was employed to study the electrochemical behavior of metal ions in the presence of selenite.
Experiments were conducted across a range of pH values and acid concentrations.
Analysis of synthetic samples was performed under identified optimal conditions.

Main Results:

Selenite addition decreased the DPV peak heights for copper, lead, cadmium, and zinc.
Significant interference was observed across a wide range of pH and acid conditions.
Interference was found to be negligible at pH 8.5, particularly when selenite was present in large excess (50-fold).
A synthetic sample with 10(-5)M metal ions and 50-fold excess selenite was successfully analyzed at pH 8.5 without interference.

Conclusions:

The study successfully identified pH 8.5 and a high concentration of selenite as conditions to overcome DPV interference from selenite for specific metal ions.
Optimized conditions allowed for accurate analysis of copper, lead, cadmium, and zinc.
Achieved detection limits were 3 x 10(-7)M for cadmium and lead, 1 x 10(-6)M for copper and zinc, and 3 x 10(-7)M for selenite.