Temperature Stability Of 1,5-Naphthalene Disulfonate At Simulated Geothermal Conditions
- Key words
- tracer studies, naphthalene disulfonic acid, naphthalene sulfonic acid, NDS, NSA, experimental geochemistry.
- Conference
- New Zealand Geothermal Workshop
- Year
- 2014
- Session
- Geothermal Geochemistry
- Language
- English
- Paper number
- 32
Full text
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Abstract
The thermal stability of 1,5-naphthalene disulfonate (1,5-NDS) has been investigated. It was subjected to a number of simulated geothermal environments in batch autoclave reactors. Experimental temperature was changed from 280 to 350℃. Exposure times were 10 and 40 hours. The results show strong dependence on the solution composition (salt concentration, pH and pOH). Comparison with published data shows lower 1,5-NDS stability when in isolation compared with a mixture of several naphthalene sulfonates. For most conditions no dependence on the initial tracer concentration is observed. Two decomposition mechanisms of pseudo-first order are suggested to explain 1,5-NDS behaviour.
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