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| Koh Harada | |
| Head of Marine Environment Division | |
| Environmental Assessment Department | |
| National Institute for Resources and Environment | |
| National Institute of Advanced Industrial Science and Technology | |
| Ministry of Economy and Industrial Technology | |
| Onogawa 16-1, Tsukuba, Ibaraki, 305-8569 Japan | |
| Tel: +81-298-61-8390 Fax: +81-298-61-8357 | |
| E-mail: harada.emtech@aist.go.jp |
8,939,000 Yen
(FY 2000; 4,553,000 Yen)
International inter-comparison works for total inorganic carbon (TC) and total alkalinity (TA) measurements in seawater were conducted in 1999 and 2000. For the TC measurement, systematic differences existed between the participated organizations, although precisions of the data in each organizations were relatively good in the 1999 activity. It suggested there were some problems in calibration method. In the 2000 activity, the differences became smaller and data obtained by the all organizations participated were within acceptable range to discuss an increase of TC from the industrial revolution. The difference of TA in the organizations in 1999 were extremely large and it was hardly acceptable. However, the difference became small in the 2000 activity, and the data were comparable when they were corrected against the certified reference materials (RCMs) which were measured simultaneously with the samples. From those results, it is strongly suggested that usage of the RCM for checking of accuracy of the measurement.
total inorganic carbon, total alkalinity, seawater, inter-comparison