Note of the experience in the preparation of CSK standard solutions and the ICES—SCOR intercalibration experiment, 1969–1970 |
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| Authors: | Mitsuko Ambe |
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| Institution: | Sagami Chemical Research Center, Sagamihara, Kanagawa 229 Japan |
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| Abstract: | Responding to the recommendation of the first Session of the International Coordinating Group for CSK, Sagami Chemical Research Center prepared a series of CSK standard solutions for PO4-P, SiO2-Si, NO2-N and NO3-N in addition to KI03 standard solution for dissolved oxygen, satisfying the following requirements: (i) the highest accuracy attainable, (ii) covering the whole range of concentrations met within seawater and (iii) ensuring at least one year's stability after preparation.The ICES—SCOR International Intercalibration Experiment was performed using sets of unknown synthetic solutions of P, Si, NO2 and NO3 which were offered by Sagami Chemical Research Center with the participation of 56 world laboratories.Using the reported data from 36 laboratories which were collected by Prof. F. Koroleff (Finland), Chairman of the programme, C.V. values (Coefficient of Variation in %) for the deviation of the reported values for the distributed samples from the correct concentrations are calculated, ranging from 4.1 to 25.8 for several nutrient elements. The fraction of deviation originating from discrepancies in the standards used was calculated to discover possible causes leading to the variance. C.V. values of the deviation of the experiment were compared with the corresponding C.V. values for the test samples as determined by our laboratory; this revealed that the C.V. values for the reported data from the experiment were 3.4 to 22 times larger than those for the test samples. |
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