Stripping voltammetry using sequential standard addition calibration with the analytes themselves acting as internal...

Area of Science:

• Analytical Chemistry
• Electrochemistry
• Environmental Analysis

Background:

• Standard addition is a common calibration technique in analytical chemistry.
• Traditional standard addition methods can be limited by the need for separate internal standard solutions.
• Improving precision and accuracy in trace metal analysis is crucial for environmental monitoring.

Purpose of the Study:

• To introduce a novel two-step standard addition calibration procedure for stripping voltammetry.
• To enable analytes to serve as internal standards for each other, eliminating the need for external standard solutions.
• To enhance the precision and accuracy of trace metal measurements in environmental samples.

Main Methods:

• Development of a two-step standard addition calibration technique.
• Utilizing analytes as internal standards within the stripping voltammetry process.
• Validation against traditional standard addition methods using synthetic and real ambient air sample digests.

Main Results:

• The novel procedure significantly improves the precision of measurements compared to traditional methods.
• Accuracy of the analyte quantification was substantially enhanced.
• The method effectively measured Zinc (Zn), Cadmium (Cd), Lead (Pb), and Copper (Cu).

Conclusions:

• The proposed two-step standard addition method offers a more precise and accurate alternative for stripping voltammetry.
• This technique simplifies the calibration process by eliminating the need for separate internal standard additions.
• It provides a valuable advancement for the quantitative analysis of trace metals in environmental matrices.