Rates of dissolution of aluminosilicates in seawater
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Abstract
Dissolution of eight clay minerals, four zeolites, and quartz in seawater has been monitored for 8 1 2 years. For most of the minerals, dissolution can be described as a first-order reaction in which dissolved silica approaches from undersaturation steady concentration values with time. Characteristic reaction rate constants (k1) are of the order of 10-7 sec-1. One of the zeolites, clinoptilolite, shows a different dissolution behavior: SiO2 concentration in solution reaches a high value within one year, followed by a decline to a lower value, suggestive of precipitation of another silicate phase (possibly sepiolite). A mathematical solution is given for a kinetic equation combining the parabolic-rate and first-order rate processes. It is shown that in a wide range of silicate dissolution reactions taking place over long periods of time, the presence of the parabolic-rate dissolution processes cannot be detected, thereby making its inclusion in the kinetic equations unnecessary. The experimental rates of dissolution are comparable to the SiO2- dissolution rates in oceanic sediments near the sediment/water interface. But deeper in the sediment, the calculated dissolution rates are significantly lower than the near-interface and experimental values. © 1975.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Rates of dissolution of aluminosilicates in seawater |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(75)90213-7 |
| Volume | 25 |
| Issue | 1 |
| Year Published | 1975 |
| Language | English |
| Description | 7 p. |
| First page | 82 |
| Last page | 88 |
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