Li Ziwei, Mashio Asami S, Wong Kuo H, Hasegawa Hiroshi
Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
Institute of Science and Engineering, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan.
Anal Sci. 2025 Sep 18. doi: 10.1007/s44211-025-00849-y.
Platinum (Pt), extensively used in automotive catalytic converters and anti-cancer drugs, has led to elevated concentrations in the environment. Monitoring Pt levels in coastal ecosystems is crucial as excessive accumulation may cause ecotoxicological impacts. In this study, Undaria pinnatifida, a common edible macroalgae in Japan known for its high affinity for platinum group elements, was evaluated as a biomonitor for monitoring Pt concentrations and assessing its anthropogenic influences in coastal areas. An analytical protocol using inductively coupled plasma mass spectrometry (ICP-MS) was developed and optimized for Pt quantification in macroalgal tissues. The optimal digestion conditions included 0.24 mL/g of hydrofluoric acid and the addition of 7 mL/g of hydrochloric acid, which effectively reduced white precipitate formation and improved Pt recovery. The established method demonstrated excellent sensitivity, achieving a method blank of 16 ppt and a detection limit of 5 ppt, surpassing previously reported approaches. Applying this optimized protocol, tissue-specific Pt concentrations were determined in different parts of U. pinnatifida collected from various coastal zones. The results revealed significant spatial variations in Pt concentrations among plant organs: concentrations in blades, stipes, and sporophylls decreased from the outer bay to the inner bay, while holdfasts concentrations exhibited the opposite trend. These findings suggest distinct Pt accumulation behaviors between above-ground and below-ground tissues of U. pinnatifida, underscoring its potential for monitoring spatial variations of Pt in coastal environments.
铂（Pt）广泛应用于汽车催化转化器和抗癌药物中，导致环境中铂的浓度升高。监测沿海生态系统中的铂水平至关重要，因为过量积累可能会造成生态毒理学影响。在本研究中，裙带菜是日本一种常见的可食用大型藻类，以其对铂族元素的高亲和力而闻名，被评估为监测沿海地区铂浓度及其人为影响的生物监测器。开发并优化了一种使用电感耦合等离子体质谱（ICP-MS）的分析方法，用于大型藻类组织中铂的定量分析。最佳消解条件包括每克样品加入0.24 mL氢氟酸，并添加7 mL盐酸，这有效减少了白色沉淀的形成并提高了铂的回收率。所建立的方法具有出色的灵敏度，方法空白为16 ppt，检测限为5 ppt，超过了先前报道的方法。应用此优化方法，测定了从不同沿海区域采集的裙带菜不同部位的组织特异性铂浓度。结果显示，植物器官之间的铂浓度存在显著的空间差异：叶片、叶柄和孢子叶中的浓度从外湾到内湾逐渐降低，而固着器中的浓度则呈现相反的趋势。这些发现表明裙带菜地上和地下组织之间存在不同的铂积累行为，突出了其监测沿海环境中铂空间变化的潜力。
