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MCI Project Summaries 2008 - Smithsonian Institution

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<strong>MCI</strong> 6174.9 Anchorage Loan: Harpoon Head<br />

<strong>MCI</strong> Staff: Jennifer Giaccai, Nicole C. Little, Judy Watson<br />

White crystalline material was observed on a harpoon head between the seaweed<br />

wrapping material and the steel harpoon head, under what appeared to be a brown paint layer.<br />

Infrared analysis showed that the white material was hydrocerussite, 2PbCO3 . Pb(OH)2, a<br />

common corrosion product of lead. XRD of the two samples confirmed the presence of<br />

hydrocerussite and did not identify any other crystalline components to the sample. XRF<br />

analysis of the white material and the harpoon head itself confirmed that lead was present in the<br />

area where the corrosion product was found, but that the harpoon head itself did not contain high<br />

levels of lead.<br />

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