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standardization of environmental data and information - International ...

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3.3.2. Chemical <strong>and</strong> physical <strong>environmental</strong> parameters<br />

The cylindrical samples taken with the multiple corer were<br />

subsampled with a cylinder 28 millimetres in diameter, cut into sections at<br />

the following locations:<br />

JET 1: 0-0.25, 0.25-0-5, 0.5-0.75, 0.75-1.0, 1.0-2.0, 2.0-3.0<br />

centimetres;<br />

JET 2, 3 <strong>and</strong> 4: 0-0.25, 0.25-0.5, 0.5-0.75, 0.75-1.0, 1.0-1.5, 1.5-<br />

2.0, 2.0-3.0 cm.<br />

These subsamples were then analysed for chemical parameters<br />

such as total organic carbon (TOC), total nitrogen (TN), calcium carbonate<br />

(CaCO3) <strong>and</strong> opal. TOC <strong>and</strong> TN were measured with a CHN (carbon,<br />

hydrogen <strong>and</strong> nitrogen) analyser (Yanaco model MT-5) <strong>and</strong> CaCO3 with a<br />

CO2 coulometer. Opal was extracted over a five-hour period using 2M<br />

Na2CO3 <strong>and</strong> then analysed with the molybdenum-yellow absorption<br />

spectrometric method.<br />

INTERNATIONAL SEABED AUTHORITY 203

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