Comparison of continuous flow analysis and ion chromatography for determinations of nitrate, nitrite and phosphate ions in seawater and development of related seawater certified reference materials

IF 0.8 4区工程技术 Q4 CHEMISTRY, ANALYTICAL

Accreditation and Quality Assurance Pub Date : 2024-04-10 DOI:10.1007/s00769-024-01586-x

Chikako Cheong, Toshihiro Suzuki, Tsutomu Miura, Akiharu Hioki

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Abstract

Determinations of three nutrients (nitrate, nitrite and phosphate ions) in seawater were investigated by continuous flow analysis (CFA) based on colorimetry and ion chromatography (IC). The accuracies of those methods were examined by discussing their uncertainties. Although some of the nitrite and phosphate validations were not sufficient due to low concentrations, the results of nitrate agreed well with each other. While CFA is popular in this field, its comparison with IC was reported for the first time and contributed to an increase in the reliability of the analytical results. Finally, the investigation led to the development of three kinds of seawater certified reference materials (CRMs) of the National Metrology Institute of Japan (NMIJ) (NMIJ CRM 7601-a, 7602-a and 7603-a) for which the property values of nutrients including dissolved silica were given. The details of the development are described in the present paper.

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比较连续流动分析法和离子色谱法测定海水中的硝酸盐、亚硝酸盐和磷酸盐离子，并开发相关的海水认证参考材料

通过基于比色法和离子色谱法（IC）的连续流动分析法（CFA），研究了海水中三种营养物质（硝酸盐、亚硝酸盐和磷酸盐离子）的测定。通过讨论这些方法的不确定性，对其准确性进行了研究。虽然亚硝酸盐和磷酸盐的一些验证结果因浓度较低而不够充分，但硝酸盐的结果却相互吻合。虽然 CFA 在这一领域很流行，但它与 IC 的比较是首次报道，有助于提高分析结果的可靠性。最后，调查还促成了日本国家计量研究院（NMIJ）三种海水有证标准物质（NMIJ CRM 7601-a、7602-a 和 7603-a）的开发，其中给出了包括溶解二氧化硅在内的营养物质的属性值。本文介绍了开发的详细情况。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accreditation and Quality Assurance 工程技术-分析化学

CiteScore

1.80

自引率

22.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Accreditation and Quality Assurance has established itself as the leading information and discussion forum for all aspects relevant to quality, transparency and reliability of measurement results in chemical and biological sciences. The journal serves the information needs of researchers, practitioners and decision makers dealing with quality assurance and quality management, including the development and application of metrological principles and concepts such as traceability or measurement uncertainty in the following fields: environment, nutrition, consumer protection, geology, metallurgy, pharmacy, forensics, clinical chemistry and laboratory medicine, and microbiology.