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Trace metal analysis by anodic-stripping voltammetry Effect of surface-active substances
Talanta
|June 1, 1982
Summary
Surfactants and humic substances impact heavy metal detection in seawater. Higher concentrations generally reduce peak heights for copper, lead, and cadmium using voltammetry, though copper showed varied results.
Area of Science:
- Environmental Chemistry
- Analytical Chemistry
Background:
- Surfactants and humic substances are common in marine environments.
- Their influence on heavy metal detection using voltammetry requires detailed study.
Purpose of the Study:
- To investigate the effect of surfactants and humic substances on heavy metal peak heights.
- To analyze the impact on copper, lead, and cadmium detection in synthetic seawater.
Main Methods:
- Differential pulse anodic-stripping voltammetry was employed.
- Analysis was conducted in synthetic seawater with varying concentrations of cationic, anionic, neutral surfactants, and humic substances.
Main Results:
- Surfactant concentrations below 0.1 mg/l showed insignificant effects.
- Higher concentrations typically decreased peak heights for lead and cadmium, with copper showing a mixed response (decrease and increase).
- Peak heights were largely pH-independent, except in alkaline conditions with humic substances.
Conclusions:
- Adsorption and complex formation are likely mechanisms influencing heavy metal peak heights.
- The findings are crucial for accurate heavy metal monitoring in complex aquatic matrices.
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