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Spatiotemporal Variations of Platinum in Seawater in Otsuchi Bay, Japan After the 2011 Tsunami

Spatiotemporal Variations of Platinum in Seawater in Otsuchi Bay, Japan After the 2011 Tsunami

Asami Suzuki Mashio, Hajime Obata, Tomohiro Shimazaki, Hideki Fukuda, Hiroshi Ogawa

Sci Total Environ. 2020 Mar 15;708:134659.

PMID: 31791760

Abstract:

Huge tsunami waves devastated coastal areas on the Pacific Ocean side of northern Japan on March 11, 2011, and seriously damaged these coastal environments. Since the tsunami, we have not yet obtained data on the present state of and changes in trace metal concentrations in seawater in these areas. Platinum (Pt), one of the rarest elements in the Earth's crust, is now widely used in a range of products, such as catalytic converters in automobiles and anticancer drugs. Increasing use and dispersal of Pt has the potential to affect aquatic environments, although Pt concentrations in open ocean seawater have been found to be very low (approximately 0.2 pmol/L). In this study, we reveal the Pt concentrations in seawater and sediment in Otsuchi Bay after the tsunami, and evaluate the behavior of the Pt. The concentrations of dissolved Pt in seawater are 0.40-1.99 pmol/L and those in river water are below the detection limit of 0.015 pmol/L. Comparing the Pt concentrations in May, higher concentrations were obtained in 2013 than in 2012, especially in the deepest seawater. The total Pt concentrations in sediment samples were 0.46-14.4 ng/g in Otsuchi Bay. Using a sequential leaching technique on the sediments, Pt concentrations in the acetic-acid fractions were 0.19-1.13 ng/g, and those in the acetic acid + hydrochloric acid hydroxylamine fractions were less than 0.03-0.71 ng/g. Seasonal variations in dissolved Pt concentrations reflected changes in the water mass structure. During the stratification season, vertical profiles indicated that Pt concentrations tended to increase with depth due to supply from the sediments, whereas in winter, the water mass was vertically well mixed. The Pt was supplied to the bottom of the water from the sediments, probably due to loosely adsorbed Pt on sediment particles being remobilized during post-depositional processes. The increased internal input of Pt within Otsuchi Bay can be explained by the release of 1.3-5.6% of the leachable fraction from sediments, probably transported from the land by the tsunami, during the water residence time in the bay.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
CS35505	Trace Metals (Dissolved) PT - 1			Price

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