Determination of Iron (Fe) and Potassium (K) in Closed Aquaponic Systems by Using Atomic Absorption Spectroscopy and Flame Photometer

Nur Atikah Abdul Karim, Hashim Baharin

Abstract


Aquaponics is the combination of aquaculture and hydroponic cultivation plants. In this study, fish’s food and waste were used to develop a sustainable aquaponic system. Hydroponic tank was planted with water spinach (Ipomoea aquatica) that has been used to treat water from an aquaculture system stocked with Koi fish (Cyprinus carpio). The unplanted hydroponic tank was concurrently run as a control unit. The prototype of aquaponic systems was built which consists of fish culture tank, aeration pump and sand medium. The Koi fish were feed three times a week with diet pellets containing 5% of iron concentration. The concentration changes of dissolved iron (Fe) and potassium (K) were the function to increase the biomass of Koi fish by feeding the fish which contributed to the growth of water spinach through aquaculture-hydroponic systems. This observation was monitored for more than 8 weeks. The optimum temperature for aquaponic systems to operate was in a range of 25°C to 29°C. The concentration of Fe2+ in water from an aquaponics system was determined using Atomic Absorption Spectroscopy (AAS) while for concentration of K+ ions determined by Flame Photometer. Calibration correlation coefficient value for calibration standard Fe was 0.9999, while for K was 0.9992. The final concentration of K+ in tank B was 17.1706 mg/L, while in tank C was 17.3402 mg/L. For Fe2+ the final concentration in tank C was 0.038 mg/L.

Keywords


Aquaponic; aquaculture; hydroponic; Ipomoea aquatica; Cyprinus carpio

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References


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