文档介绍：r
CertiPUR
reference materials
for reliable calibration
in atomic absorption
spectroscopy
Atomic absorption spectroscopy
• Methods
• Traceability
CertiPURr Products
• ICP standards
• Internal standard for ICP
• Isotope-enriched standards
• Multi element standards
• AAS standards
• Tritisolr standards
• Oil-soluble salts
• Standards dissolved in oil
• Multi element standards, dissolved in oil
ICP standards are analysed using ICP/OES and ICP/MS methods in general.
As an additional control, elemental analysis is carried out by titration.
Content analysis has been optimised for all ICP standards by reviving a
very old analytical method – use of a suitable internal standard.
For this precision analysis, a method has been developed for all 68 element
standards. The advantage is obvious: a high degree of precision; this is
reflected in the uncertainty data, which can vary, depending on the
chemical nature of the element concerned.
AAS standards are normally determined titrimetrically. Depending on the
element involved, the ICP/OES method is also used.
Traceability
ICP single- and multi-element standards are directly traceable to an
international standard. Direct traceability means that the measuring
instrument used in quality control is calibrated prior to each measurement
using a primary or secondary standard obtained from an international
institution such as NIST (National Institute of Standards and Technology,
Gaithersburg, USA).
Traceability to the primary standard is documented in the Certificate of
Analysis with indication of the batch used.
Isotope-enriched standards are certified directly by international bodies
such as BAM (Bundesanstalt für Materialforschung und -prüfung, Berlin)
and IRMM (Institute for Reference Materials and Measurements, Geel).
Standards used in AAS are also traceable to SRM from NIST. Analysis of
content is generally carried out titrimetrically and is traceable