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Abstract <p>In this research, the most common arsenic species in seaweeds from Ho Chi Minh City (Vietnam) were determined using ion chromatography-tandem inductively coupled plasma mass spectrometry. An optimized extraction procedure was established, involving a 20 mL MeOH : H<sub>2</sub>O (1 : 1, v/v) solution at 50°C for 10 min<i>.</i> Chromatographic separation of all the species was achieved in less than 7 min in gradient elution mode using an anion exchange column AS7, and the mobile phase consisted of 300 mM (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> and 3% MeOH at pH 10.3. The linear range for each arsenic species was from 0.1 to 100 µg/L. The method detection limits for arsenobetaine, dimethylarsinic acid, As(III), monomethylarsonic acid, and As(V) were 21.19, 4.76, 4.29, 2.78, and 2.28 µg/kg, respectively, and the method quantification limits were 100, 15.86, 14.31, and 9.27, 7.62 µg/kg, respectively. The method was validated for accuracy, precision, and specificity. Analysis of 15 seaweed samples revealed the presence of As(III) in some samples, while As(V) was not detected. This study presents a novel method for arsenic determination and provides valuable insights into arsenic levels in seaweed. The developed method offers a valuable tool for assessing arsenic contamination in marine ecosystems and understanding its potential risks to human health.</p>

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Arsenic Species Determination in Seaweeds by Ion Chromatography–Inductively Coupled Plasma Mass Spectrometry

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • Nguyen Quoc Thang,
  • Hong Khanh Trung,
  • Le Van Tan,
  • Nguyen Thi Kim Phuong,
  • Nguyen Thi Kim Ngan,
  • Tran Quang Hieu

摘要

Abstract

In this research, the most common arsenic species in seaweeds from Ho Chi Minh City (Vietnam) were determined using ion chromatography-tandem inductively coupled plasma mass spectrometry. An optimized extraction procedure was established, involving a 20 mL MeOH : H2O (1 : 1, v/v) solution at 50°C for 10 min. Chromatographic separation of all the species was achieved in less than 7 min in gradient elution mode using an anion exchange column AS7, and the mobile phase consisted of 300 mM (NH4)2CO3 and 3% MeOH at pH 10.3. The linear range for each arsenic species was from 0.1 to 100 µg/L. The method detection limits for arsenobetaine, dimethylarsinic acid, As(III), monomethylarsonic acid, and As(V) were 21.19, 4.76, 4.29, 2.78, and 2.28 µg/kg, respectively, and the method quantification limits were 100, 15.86, 14.31, and 9.27, 7.62 µg/kg, respectively. The method was validated for accuracy, precision, and specificity. Analysis of 15 seaweed samples revealed the presence of As(III) in some samples, while As(V) was not detected. This study presents a novel method for arsenic determination and provides valuable insights into arsenic levels in seaweed. The developed method offers a valuable tool for assessing arsenic contamination in marine ecosystems and understanding its potential risks to human health.