Chapter 2.4. CONFIRMATORY METHODS FOR ELEMENTS
United Kingdom
Confirmatory analyses for chemical elements shall be based on the concept of unequivocal identification and accurate as well as precise quantification by means of physical-chemical properties unique to the chemical element at hand (e.g. element characteristic wavelength of emitted or absorbed radiation, atomic mass) at the level of interest.
The following methods or combinations of methods are considered suitable for the identification of chemical elements:
Table 7
Suitable confirmatory methods for chemical elements
| Technique | Measured parameter | |
|---|---|---|
| Differential pulse anodic stripping voltametry | Electric signal | |
| Atomic absorption spectrometry | ||
| Flame | Absorption wavelength | |
| Hydride generation | Absorption wavelength | |
| Cold vapour | Absorption wavelength | |
| Electrothermal atomisation (graphite furnace) | Absorption wavelength | |
| Atomic emission spectrometry | ||
| Inductively coupled plasma | Emission wavelength | |
| Mass spectrometry | ||
| Inductively coupled plasma | Mass-to-charge-ratio | |
- 2.4.1Common performance criteria and other requirements for confirmatory methods
- 2.4.2Additional performance criteria and other requirements for quantitative methods of analysis
- 2.4.2.1Trueness of quantitative methods
- 2.4.2.2Precision of quantitative methods
- 2.4.3Specific requirements for differential pulse anodic stripping voltametry (DPASV)
- 2.4.4Specific requirements for atomic absorption spectrometry (AAS)
- 2.4.4.1Specific requirements for flame AAS
- 2.4.4.2Specific requirements for graphite furnace AAS
- 2.4.5Specific requirements for hydride generation atomic absorption spectrometry
- 2.4.6Specific requirements for cold vapour atomic absorption spectrometry
- 2.4.7Specific requirements for inductively coupled plasma atomic emission spectrometry (ICP-AES)
- 2.4.8Specific requirements for inductively coupled mass spectrometry (ICP-MS)(11))