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Rate of dissolution of diatom silica walls in seawater

โœ Scribed by A. Kamatani; J. P. Riley

Publisher
Springer-Verlag
Year
1979
Tongue
English
Weight
563 KB
Volume
55
Category
Article
ISSN
0025-3162

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โœฆ Synopsis

The solubility and dissolution rate of silica were investigated using cell walls prepared from two species of diatoms, Thalassiosira decipiens and Rhizosolenia hebetata forma semispina. The solubility (c e) as a function of temperature (T, OC) can be described by the following equation: c e (SiO 2 mg 1 -I ) = 67.8 + 1.48 T. The firstorder reaction equation without the surface-area term was considered to be reasonable in estimating the dissolution rate of biogenic silica in the ocean system. The rate of dissolution differed not only from one species to another but also from one portion to another portion of the same wall. The rate constants of dissolution in the ocean system were estimated to range in the order of from 10-I to 10 -9 per hour.

๐Ÿ“œ SIMILAR VOLUMES

Dissolution rates of silica from diatoms
Dissolution rates of silica from diatoms decomposing at various temperatures
โœ A. Kamatani ๐Ÿ“‚ Article ๐Ÿ“… 1982 ๐Ÿ› Springer-Verlag ๐ŸŒ English โš– 506 KB

In a study of silica dissolution from diatoms, the rate coefficient (K) h -1 of raw diatom cells was estimated as 4 to 5 times smaller than that of the acid-digested siliceous skeletons. The dissolution rate coefficient at early stage (K1) can be predicted as a function of temperature (T ~ In K1 = a