A new continuous calibration method for inductively coupled plasma spectrometry.

Area of Science:

• Analytical Chemistry
• Spectroscopy

Background:

• Conventional calibration methods in atomic emission spectrometry can be time-consuming.
• Optimizing calibration procedures is crucial for efficient and accurate elemental analysis.

Purpose of the Study:

• To develop and validate a new stirred tank calibration method for inductively coupled plasma atomic emission spectrometry (ICP-AES).
• To compare the performance of the new method against conventional calibration techniques.

Main Methods:

• A stirred tank system was employed, introducing concentrated standards at a controlled rate into deionized water.
• Solution concentration variation over time was modeled using stirred tank equations.
• Emission intensity was recorded and converted to a concentration scale for calibration line generation.

Main Results:

• Optimal parameters for linearity were identified: V(p)=15 cm³, Q(e)=0.6-0.75 ml/min, and Q(s)=1-1.2 ml/min.
• The new method generated calibration graphs rapidly (e.g., >40 standards in ~10 min) with improved linearity and precision.
• Analysis time was significantly reduced, with complete procedures taking approximately 5 minutes.

Conclusions:

• The stirred tank calibration method is a viable, efficient alternative to conventional techniques for ICP-AES.
• The method demonstrated comparable accuracy to traditional methods while offering enhanced speed, linearity, and precision.
• Dynamic calibration and standard addition techniques were easily integrated, further optimizing analysis time.