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- Title
Role of salinity in the dissolution rates of CaCO<sub>3</sub> and its implications for aquaculture liming.
- Authors
Sá, Marcelo Vinícius do Carmo e; Boyd, Claude E.
- Abstract
This work aimed at assessing the role of salinity in the dissolution rates of CaCO3, discussing its implications for aquaculture liming. A simplified formula of artificial seawater without HCO3− was initially prepared. Four batches of 10 L of diluted artificial seawater (salinity = 3.3 g/L) without HCO3− were prepared. Sixteen Erlenmeyer flasks were filled up with 2 L each of the diluted artificial seawater without HCO3−. Besides, 16 other 2,000-ml Erlenmeyer flasks were filled up with 2 L of distilled water (freshwater). The experimental treatments were formed by applying increasing amounts of analytical-grade sodium bicarbonate (NaHCO3) upon brackish water and freshwater. Accordingly, four initial levels of total alkalinity (TA) have been set up as follows: 4-6, 33-35, 62-63 and 120-122 mg/L. Next, approximately one gram of analytical-grade calcium carbonate (CaCO3) was applied onto each flask. Water's pH, TA and calcium concentration were determined weekly over a 7-week period, by appropriate methods. For a same initial TA, TA increase over time after CaCO3 application was lower in the brackish water flasks than in the freshwater ones. This was especially clear for moderate (63 mg/L) and high (120 mg/L) alkalinities. It was concluded that brackish and saline waters used for aquaculture would only benefit from CaCO3 liming if their alkalinities were lower than 60-80 mg/L.
- Subjects
SALINITY; DISSOLUTION (Chemistry); AQUACULTURE; BICARBONATE ions; CALCIUM
- Publication
Aquaculture Research, 2018, Vol 49, Issue 1, p576
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/are.13489