Agilent Technologies Evaluation of Three Methods of Matrix Modifier Injection in Graphite Furnace AAS Application Note

About this manual

The document investigates the determination of metals by graphite furnace atomic absorption spectroscopy (GFAAS), focusing on the use of chemical matrix modifiers to stabilize analytes or volatilize sample matrices. It specifically examines three methods for introducing a nickel modifier: pre-injection with wet deposition, pre-injection with dry deposition, and normal simultaneous injection with the sample.

The study utilized two Agilent instrument configurations: the SpectrAA 20ABO equipped with the GTA-96 graphite furnace and PSD-96 autosampler, and the SpectrAA 400P with similar components. The evaluation compared these methods based on sensitivity (characteristic mass), accuracy, and precision for arsenic analysis.

What's inside

• Introduction
• Reagents and Instrumentation
• Procedure
• Graphite Furnace Parameters
• Autosampler Parameters
• Results
• Sensitivity Analysis

Frequently asked questions

What is the purpose of using a chemical matrix modifier in graphite furnace atomic absorption spectroscopy?

The modifier is used to stabilize the analyte or volatilize the bulk of the sample matrix, which reduces background signal or chemical interference.

What was the specific concentration and acid used for the arsenic test solutions in this study?

The study used arsenic solutions with concentrations of 10.0, 25.0, and 50.0 mg/L made in 1% Nitric Acid.

What were the atomize temperature and clean-out temperature settings used for all three methods?

An ash/char temperature of 700 °C was used with an atomize temperature of 2500 °C, followed by a clean-out step at 2800 °C.