This document introduces the direct atomic absorption measurement method of phosphorus.
The document details a method for determining phosphorus directly via atomic absorption, overcoming traditional difficulties associated with vacuum UV measurements. It utilizes electrodeless discharge lamps (EDLs) to allow the use of secondary resonance lines at 213.6 nm on conventional instruments.
Two analytical techniques are presented: flame AA using a nitrous-oxide/acetylene flame and carbon rod AA. The text provides specific instrumental conditions, detection limits, characteristic concentrations, and calibration curve data for both methods.
| Wavelength (Flame) | 213.6 nm |
|---|---|
| Spectral band width (Flame) | 0.2 nm |
| EDL power | 6 watts |
| Characteristic concentration (Flame) | 125 pg/mL |
| Detection limit (Flame) | 40 pg/mL |
| Maximum ash temperature (Carbon Rod) | 1500 °C |
| Atomize temperature (Carbon Rod) | 2400 °C |
| Characteristic concentration (Carbon Rod) | 14 ng |
| Detection limit (Carbon Rod) | 4 ng |
The secondary resonance line doublet at 213.62 and 213.55 nm may be used in place of the primary resonance lines.
A strongly reducing, slightly luminous flame using nitrous-oxide/acetylene.
Yes, background correction is enabled for the determination of phosphorus by carbon rod AA.