Abstract:
The demand for Portunus pelagicus) increases every year, this has encouraged an increase in crab production in both the capture and aquaculture sectors. Indonesia is number four in the country that exports the most pasteurized crab meat. From 2019 to 2020, export volume increased by 13.25%. Increasing exports in the form of pasteurized crab meat has the potential to increase waste. Waste in waters can come from industrial, household, agricultural and aquaculture activities. Waste has the potential to pollute the environment through direct discharge into the environment. This research was carried out in April-October 2023. It was carried out at the Analytical Chemistry Laboratory of the Faculty of Science and Technology, the Biotechnology Laboratory of the Faculty of Fisheries and Marine Affairs, the Multipurpose-3 Laboratory for Analysis of Materials/Materials/Products of the Faculty of Pharmacy, and the Engineering and Engineering Life Sciences Institute, Airlangga University. The method used in this research was an experimental method. The research design used was a Completely Randomized Design (CRD) using 6 types of treatment, namely negative control with 100 mg/L sterile distilled water, positive control with 100 mg/L chitosan, and the addition of nanochitosan as bioadsorbent with doses of 25 mg/L, 50 mg/L, 100 mg/L, 200 mg/L, 400 mg/L and 3 repetitions for each treatment. The research parameters observed in this study were the bioadsorbent dosage of crab shell nanochitosan (Portunus pelagicus), nanochitosan particle size, and the content of the heavy metal iron (Fe). The data obtained is data on the reduction in levels of the heavy metal ion iron (Fe), then analyzed using statistical tests. The statistical test used in this research is Analysis of Variance (ANOVA) and followed by the Duncan 95% test if there are significant differences in the treatments. Based on the research, nanochitosan derived from crab shells shows that the effectiveness of nanochitosan from crab shell as a bioadsorbent is between 68.41% ± 0.46 and 82.75% ± 0.2. The optimum dosage of nanochitosan from crab shell as a bioadsorbent is at 400 mg/L.
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