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All Journal Akuatik: Jurnal Sumberdaya Perairan
Umroh
Ilmu Kelautan
Agriculture, Biological Sciences & Forestry Environmental Science

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Perbandingan Akumulasi Logam Berat (Timbal dan Tembaga) Di Akar, Daun dan Sedimen Pada Mangrove Sonneratia alba Di Pantai Tanjung Bunga dan Pantai Koala Pangkalpinang Margaretha Ruryasari Retha; Umroh; Irma Akhrianti; Hartoyo Notonegoro
Akuatik: Jurnal Sumberdaya Perairan Vol 19 No 1 (2025): AKUATIK : Jurnal Sumberdaya Perairan
Publisher : Department of Aquatic Resources Management, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung

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Abstract

In the process of Spirulina cultivation, environmental factors, particularly light intensity, play a crucial role in influencing its growth. Spirulina production is estimated to be between 3000 and 20,000 tons per year. Spirulina is considered a nutraceutical due to its high nutritional quality (protein, essential amino acids and fatty acids, polysaccharides, carotenoids, vitamins, and iron). The purpose of this study is to determine the effect of different light intensities on the growth rate of Spirulina platensis and to determine the relationship between light intensity and protein content in Spirulina platensis. This research was conducted in the Marine Science laboratory, while protein testing will be done in the Biology laboratory using the Kjeldahl method to determine protein content. The research findings indicate that light intensity significantly affects the growth rate of Spirulina platensis. Light intensity of 3000 lux proved to be the most optimal, resulting in rapid and stable growth without triggering physiological stress, while an intensity of 1000 lux produced slow growth and 6000 lux accelerated initial growth but risked stagnation due to light stress. Treatment with an intensity of 3000 lux yielded the highest protein content of 76%, compared to 1000 lux (65%) and 6000 lux (68%), and variations in light intensity from 1000 to 6000 lux did not significantly affect the yield of Spirulina platensis.
Perbandingan Akumulasi Logam Berat (Timbal dan Tembaga) Di Akar, Daun dan Sedimen Pada Mangrove Sonneratia alba Di Pantai Tanjung Bunga dan Pantai Koala Pangkalpinang Penti Penti; Umroh; La Ode Wahidin; Irma Akhrianti
Akuatik: Jurnal Sumberdaya Perairan Vol 19 No 1 (2025): AKUATIK : Jurnal Sumberdaya Perairan
Publisher : Department of Aquatic Resources Management, Faculty of Agriculture, Fisheries, and Biology, University of Bangka Belitung

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Abstract

Mangroves have the ability to absorb and store heavy metals such as lead (Pb) and copper (Cu) from the environment. Heavy metals that enter the environment at certain concentrations can be neutralized by hyperaccumulator plants, one of which is mangroves. The objective of this study is to determine the comparison of heavy metal accumulation (lead and copper) in the roote, leaves and sediments of Sonneratia alba mangroves at Tanjung Bunga Beach and Koala Pangkalpinang Beach. The study was conducted in April 2025 at two locations: Tanjung Bunga Beach and Koala Pangkalpinang Beach. The methods used in this study were descriptive methods and the sampling method employed was purposive sampling. The analytical method used to measure the concentrations of heavy metals Pb and Cu in sediment, roots and leaves of mangroves was Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The analysis results showed that the heavy metal Pb content in the roots, leaves and sediments of Sonneratia alba mangrove at Tanjung Bunga Beach was 0,614 mg/kg, 0,726 mg/kg and 15,7 mg/kg, respectively, while the heavy metal Pb content in the roots, leaves and sediments of Sonneratia alba mangroves at Koala Beach was 1,143 mg/kg, 0,270 mg/kg and 10,8 mg/kg, respectively. The results indicate that Sonneratia alba mangroves have only a slight ability to absorb heavy metals Pb and Cu.
Co-Authors Hartoyo Notonegoro Irma Akhrianti La Ode Wahidin Margaretha Ruryasari Retha Penti Penti