Commonly used methodologies for inorganic analysis in international key comparisons

Accurate determination of lead in Chinese herbs using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS)

“…The coordination of the international comparison CCQM-P97 provided us with an opportunity to develop a robust method for the certification of Pb (SI-traceable mass fraction of Pb (value ± U, k = 2): 1.653 ± 0.025 mg kg À1 ) in the herbal sample, which was the first in-house herbal reference material produced in the laboratory. More importantly, the developed method could enable analytical laboratories to follow the protocol for analysis easily because a low cost quadrupole instrument was used for Pb isotope ratio measurements and IDMS analysis (Yip, Lam, & Tong, 2009). Following the international comparison CCQM-P97, GL and Hong Kong Accreditation Service (HKAS) jointly submitted a proposal to the Asia-Pacific Laboratory Accreditation Co-operation (APLAC) in May 2008 about the organisation of a proficiency testing programme for the determination of Pb (and Cd as well) in the same herbal material (APLAC PT065).…”

High accuracy measurements of trace elements in drinking water by exact matching isotope dilution mass spectrometry (IDMS)

“…All experiments were conducted such that metrological traceability to the SI through NIST was established [17]. This method was also rigorously validated by including all possible biases, such as ion pair bias (measurement of two isotopic ratios for each analyte), instrumental bias (by comparing results obtained from sector field (SF) ICP-MS and ICP-MS), operator bias, reproducibility and repeatability.…”

Determination of Trace Amount of Cobalt in a Steel Sample by Two-dimensional On-line Redox Derivatization Liquid Chromatography

“…Atomic spectrometric methods such as inductively coupled plasma atomic emission spectrometry (ICP-AES) have widely been used for elemental analysis of steel and alloy samples. 13,14) Spectrometers for ICP-AES can measure various elements simultaneously in a single sample analysis and some of them offer limits of detection down to ppb levels. 14) However, chemical and/or spectral inter-element interferences may not be completely resolved, even using the sophisticated detection system.…”

“…13,14) Spectrometers for ICP-AES can measure various elements simultaneously in a single sample analysis and some of them offer limits of detection down to ppb levels. 14) However, chemical and/or spectral inter-element interferences may not be completely resolved, even using the sophisticated detection system. 14,15) Since two-dimensional on-line derivatization liquid chromatography can work for the removal of the interfering elements and matrix from analytes, it enables one to determine trace amounts of analytes accurately without tedious off-line preseparation.…”