Journal
MARINE POLLUTION BULLETIN
Volume 107, Issue 1, Pages 333-339Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.03.038
Keywords
Plastic additives; Lead; Leaching experiment; Low-lead layer
Funding
- Environment Research and Technology Development Fund of the Ministry of the Environment (Japan) [B-1007, 4-1502]
- Global Center of Excellence Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [E07]
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The long-distance transport potential of toxic lead (Pb) by plastic marine debris was examined by pure water leaching experiments using plastic fishery floats containing high level of additive-Pb such as 5100 74.3 mg kg(-1). The leaching of Pb ended after sequential 480-h leaching experiments, and the total leaching amount is equivalent to approximately 0.1% of total Pb in a float. But it recovered when the float was scratched using sandpaper. We propose that a low-Pb layer, in which Pb concentration is negligibly small, be generated on the float surface by the initial leaching process. Thickness of the layer is estimated at 2.5 +/- 1.2 mu m, much shallower than flaws on floats scratched by sandpaper and floats littering beaches. The result suggests that the low-Pb layer is broken by physical abrasion when floats are washed ashore, and that Pb inside the floats can thereafter leach into beaches. (C) 2016 Elsevier Ltd. All rights reserved.
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