The use of the forked platform graphite furnace atomic absorption spectrometry method for the determination of trace elements in stainless steel is described. This method has high sensitivity and low background interference.
The document details the analysis of trace elements (As, Se, Pb, Cd, Sb, Bi, and Ag) in stainless steel samples using Graphite Furnace Atomic Absorption Spectroscopy (GFAAS). It highlights the use of a new forked platform design installed in partitioned style tubes to minimize physical contact and reduce chemical and background interferences, particularly for volatile elements.
The methodology covers sample preparation involving the dissolution of stainless steel shavings, the use of specific chemical modifiers (such as magnesium nitrate and sulfuric acid), and standard additions calibration. The note provides instrument operating parameters, furnace parameters, and chemical modifier volumes used to achieve high sensitivity and precision in the presence of high metal matrices.
| Major constituents concentration | Fe -75%, Cr - 13%, Ni, - 8%, MO - 2%, and Al - 1% |
|---|---|
| Sample volume range | 3 to 5 pL |
| Maximum atomization ramp rate | 2000 °C/sec |
| Atomization hold time | 2.7 seconds |
The study analyzed for seven elements: As, Se, Pb, Cd, Sb, Bi, and Ag.
A 1% Mg(NO3)2 modifier was used for both As and Se determinations.
It provides minimal physical contact between the platform and tube wall, preventing platform rotation during insertion and ensuring stability.