Hambantota Maha Lewaya dawn salt harvest: brine density checks with Baume hydrometers?
4 Answers from travellers
Quality control in the marine salterns of Hambantota depends on daily pre-dawn hydrometer testing across evaporation stages. Ocean water enters at 3.5° Baumé (Be). As sun and dry-zone wind evaporate water through the condensers, iron and calcium carbonate drop out first, followed by gypsum (calcium sulfate) between 14° and 24° Be. Brine is channeled into shallow crystallizer beds strictly when it reaches 25° Be, where pure sodium chloride crystallizes. Once brine density climbs past 29.5° Be, it must be drained off as bitterns; allowing evaporation to reach 30°+ Be causes bitter magnesium salts to contaminate the food salt.
Testing must occur before dawn sun heats the brine ponds; temperature changes alter hydrometer density readings and distort gate opening timings.
The dense red-orange hue of the crystallizer ponds is caused by brine shrimp (Artemia salina) and halophilic bacteria thriving in saturated saline water.
The white, mirror-like salt flats provide clean, flat reflections for pre-dawn astrophotography looking south over the Indian Ocean.
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