Determination of platinum concentration in macroalgae

Platinum (Pt) has been used extensively in automotive catalysts and anti-cancer drugs, resulting in elevated concentrations in the environment. Determination the amount of Pt in the environment is crucial, as its accumulation can lead to contamination. To detect the Pt concentration in the natural environment and evaluate anthropogenic effects in coastal areas, Undaria pinnatifida was used because of its high capacity to absorb platinum group elements and its status as a common edible macroalgae in Japan. In this research, we established analytical methods of Pt in macroalgae. By adjusting the amount of HF added during the digestion process, the optimal amount was determined to be 0.24 mL/g of 49.5% HF. Additionally, the addition of 3.5mL of 30% HCl effectively reduced the formation of white precipitate and improved the recovery rate. The established method for analyzing Pt concentration in U. pinnatifida was 5 ppt for detection limit and 16 ± 7 ppt for blank value. The concentration of Pt U. pinnatifida wakame from the sampling sites was measured by using the established method. The result shows that the concentration of Pt in the stem and sporophylls began to decrease from the outside to the inside of the bay, while the concentration in the roots showed the opposite tendency. This suggests that the above-ground and below-ground organs of U. pinnatifida are affected by different sources of Pt.

Presentation Preference: Poster

Primary Presenter: Ziwei Li, Kanazawa University (liziwei@stu.kanazawa-u.ac.jp)

Authors:

Ziwei Li, kanazawa university  (liziwei@stu.kanazawa-u.ac.jp)

Asami Mashio, Kanazawa University  (a-mashio@se.kanazawa-u.ac.jp)

Hiroshi Hasegawa, Kanazawa University  (hhiroshi@se.kanazawa-u.ac.jp)

Kuo Wong, Kanazawa University  (wong@se.kanazawa-u.ac.jp)