1. Report of the CCQM-K124: trace elements and chromium speciation in drinking water, part A: trace elements in drinking water, part B: chromium speciation in drinking water
- Author
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Fransiska Dewi, P Song, D W M Sin, W H Fung, E Mardika, W Juan, Elizabeth Ferreira, L Pérez, Jung Ki Suh, Judith Velina Lara Manzano, R. Barriga, E Lampi, Christian Uribe, Carola Pape, Elias Kakoulides, Karen E. Murphy, S L Peng, H S Chu, J N Kang'iri, I Komalasari, U Thiengmanee, T Sara Aho, H Goenaga Infante, Zoltán Mester, C Núñez, Anatoliy Krylov, L Yang, Y Lim, T Nüykki, Caroline Oster, R Shin, Q Wang, Leonid Konopelko, A R C Dablio, Olaf Rienitz, B L Kassim, S S Riquelme, R Pérez, S Vadim, David Saxby, John L. Molloy, Janaína Marques Rodrigues, Jeffrey Merrick, Sutthinun Taebunpakul, Kazumi Inagaki, Milena Horvat, H Lu, Ian White, Y H Yim, Nattikarn Kaewkhomdee, K S Lee, H Klich, J Wang, R L Damian, S Z Can, E Carrasco, Sung Woo Heo, E D Tayag, Marcelo Dominguez de Almeida, E K P Encarnacion, S E Long, Guillaume Labarraque, Charun Yafa, X Chang, Yanbei Zhu, Rosi Ketrin, Tea Zuliani, J Chao, R Jührling, Takayoshi Kuroiwa, Indu Gedara Pihillagawa, N Shi, Tom Oduor Okumu, Oktay Cankur, Therese A. Butler, T O Araújo, and Betül Ari
- Subjects
010309 optics ,Trace (semiology) ,Chromium ,chemistry ,Environmental chemistry ,0103 physical sciences ,Genetic algorithm ,General Engineering ,Environmental science ,chemistry.chemical_element ,010306 general physics ,01 natural sciences - Abstract
CCQM-K124 was organized by the Inorganic Analysis Working Group (IAWG) of CCQM to assess and document the capabilities of the national metrology institutes (NMIs) or the designated institutes (DIs) to measure the mass fractions of trace elements (As, B, Cd, Ca, Cr, Hg and Mo) and hexavalent chromium (Cr(VI)) in drinking water. The National Metrology Institute of Japan (NMIJ) and the Government Laboratory, Hong Kong SAR (GLHK) acted as the coordinating laboratories. This comparison is divided into two parts. Part A was organized by the NMIJ and the trace elements were the analytes, and Part B was organised by the GLHK and Cr(VI) was the analyte. In Part A, results were submitted by 14 NMIs and nine DIs. The participants used different measurement methods, though most of them used direct measurement using inductively coupled plasma-optical emission spectrometry (ICP-OES), inductively coupled plasma-mass spectrometry (ICP-MS), and isotope dilution technique with ICP-MS. The results of As, B, Cd, Ca and Cr show good agreement with the exception of some outliers. Concerning Hg, instability was observed when the sample was stored in the light. And some participants observed instability of Mo. Therefore, it was agreed to abandon the Hg and Mo analysis as this sample was not satisfactory for KC. In Part B, results were submitted by six NMIs and one DI. The methods applied were direct measurement using 1,5-diphenylcarbazide (DPC) derivatisation UV-visible spectrophotometry, standard addition using ion chromatography-UV-visible spectrophotometry or HPLC—inductively coupled plasma-mass spectrometry (ICP-MS) and isotope dilution technique with ion chromatography—ICP-MS. The results of all participants show good agreement. Accounting for relative expanded uncertainty, comparability of measurement results for each of As, B, Cd, Ca, Cr and Cr(VI) was successfully demonstrated by the participating NMIs or DIs. Main text To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).
- Published
- 2017