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Un-ionized ammonia (UIA) in freshwater is a primary source of toxins that kill freshwater fish. Concentrations as low as 0.03 mg/L can harm fish and concentrations of more than 2.00 mg/L can kill them. The availability of water quality monitoring systems that can directly measure UIA without any chemical treatment on samples is limited. This paper designs a new system by using a programmable system...
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