Effect of solid to solution ratio on biogenic silica determination in coastal sediments |
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| Authors: | Nattapong Loassachan Kuninao Tada |
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| Institution: | (1) Department of Applied Biological Science, Kagawa University, Miki, Kagawa 761-0795, Japan |
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| Abstract: | The method of DeMaster (1981) for measuring biogenic silica (BSi) in marine sediments was modified. We found a considerable
effect of the solid to solution (S/S) ratio on BSi determination in coastal sediments. The BSi contents determined by DeMaster’s
method were overestimated due to the contribution of clay mineral-derived extractable Si at a low S/S ratio (<1 g l−1), and incomplete recovery of BSi was observed due to incomplete extraction when using a high S/S ratio (>2 g l−1). For BSi analysis of coastal sediment samples, the BSi content of representative samples must be measured using various
S/S ratios to determine the appropriate S/S ratio in order to minimize the contribution of extractable Si derived from clay
minerals and to obtain sufficiently efficient extraction with 1% Na2CO3 before actual sample measurement. One way to determine the appropriate S/S ratio is to use artificial sediment which has
a theoretical Si and clay mineral content similar to the sediment sample composition. Using artificial sediment, the S/S ratio
of 2 g l−1 seems appropriate for measuring the BSi content of the coastal sediments investigated in this study, because 99.6% recovery
can be achieved. |
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| Keywords: | Biogenic silica chemical extraction methods coastal sediments |
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