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Evaluation of the Calibration Method for Accurate Analysis of Dissolved Silica by Continuous Flow Analysis

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Abstract

For accurately determining nutrients in seawater by continuous flow analysis (CFA), the characteristic of the calibration curve was examined in detail. Under absorbance below 0.8, the calibration curve and the bracketing methods showed more accurate results that the bias fell below 0.5%. The analytical results of dissolved silica in seawater from the nutrient maximum layer of the Pacific Ocean obtained by the proposed methods showed good agreement with those obtained by an ion exclusion chromatography postcolumn absorption spectrophotometry (IEC-postcolumn) and an ion exclusion chromatography isotope dilution ICP mass spectrometry (IEC-ID-ICP-MS). From the results, the analysis of nutrients in seawater could be accurately carried out by CFA with an expanded uncertainty of below 1% using both the calibration curve and the bracketing methods with an appropriate absorbance range.

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Authors and Affiliations

  1. Graduate School of Life and Environmental Sciences, The University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572, Japan

    Chikako Cheong, Aya Sakaguchi & Keisuke Sueki

  2. National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Umezono, Tsukuba, Ibaraki, 305-8563, Japan

    Chikako Cheong & Masaki Ohata

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  1. Chikako Cheong
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  2. Aya Sakaguchi
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  3. Keisuke Sueki
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  4. Masaki Ohata
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Correspondence to Chikako Cheong.

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Cheong, C., Sakaguchi, A., Sueki, K. et al. Evaluation of the Calibration Method for Accurate Analysis of Dissolved Silica by Continuous Flow Analysis. ANAL. SCI. 36, 247–251 (2020). https://doi.org/10.2116/analsci.19P291

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