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Analisis Dosis efektif cemaran 210Po pada Krustasea dan Moluska di Lamongan dan Sukabumi Hombing, Angelina Br; Deswita, Elvira; Makmur, Murdahayu; Istanto, Istanto; Putra, Deddy Irawan Permana; Prihatiningsih, Wahyu Retno; Refinel, Refinel; Priasetyono, Yogi
Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan Vol 19, No 2 (2024): Desember 2024
Publisher : Politeknik - Ahli Usaha Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/jpbkp.v19i2.1005

Abstract

Penelitian ini menghitung 210Po pada beberapa spesies filum krustasea dan filum moluska secara purposive sampling di Lamongan dan Sukabumi. Aktivitas 210Po dari tujuh sampel yaitu 3 sampel krustasea asal Sukabumi dan 4 sampel moluska asal Lamongan di analisis menggunakan Spektrometer Alfa energi 5,305 MeV selama 48 jam. Dari hasil analisis, didapatkan aktivitas 210Po tertinggi pada Krustasea sekitar pada Udang kipas (23,28±3,33 Bq/Kg) dan terendah pada rajungan Rajungan (1,46 ± 0,34 Bq/Kg). Aktivitas 210Po tertinggi pada Moluska terdapat pada Cumi-cumi (25,71±3,66 Bq/Kg) dan terendah yaitu Kerang hijau (6,00±1,00 Bq/Kg). Dosis efektif tahunan tertinggi dari Lamongan pada bayi dengan konsumsi udang kipas (34,22 μSv/tahun), pada anak-anak (10,11 μSv/tahun) dan dewasa (4,67 μSv/tahun). Dosis efektif tahunan tertinggi dari Sukabumi pada bayi dengan konsumsi cumi-cumi (19,27 μSv/tahun), pada anak-anak (5,69 μSv/tahun) dan dewasa (2,63 μSv/tahun). Dosis efektif tahunan ini jauh lebih rendah dari kisaran dosis yang ditetapkan The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), menandakan bahwa Indonesia aman dari unsur radioaktif 210Po. Dosis konsumsi efektif tahunan sangat bergantung pada asupan makanan laut tahunan melalui makanan ditambah dengan kebiasaan masyarakat yang selalu memasak sebelum mengkonsumsi makanan laut. Fakta ini harus dipertimbangkan ketika membandingkan dosis efektif tahunan antar wilayah atau negara serta dalam melakukan perhitungan cemaran 210Po pada beberapa spesies di filum krustasea dan moluska yang di distribusikan dan dikonsumsi.ABSTRACTThis study calculated 210Po in several species of crustacean and mollusc by purposive sampling in Lamongan and Sukabumi. The 210Po activity of seven samples, as filum 3 crustacean samples from Sukabumi and 4 mollusc samples from Lamongan, was analyzed using an alpha spectrometer with an energy of 5.305 MeV for 48 hours. The highest 210Po activity was found in Crustacea in Fan shrimp (23.28 ± 3.33 Bq/Kg) and the lowest in Crab Crab (1.46±0.34 Bq/Kg). The highest 210Po activity in Molluscs was found in Squid (25.71±3.66 Bq / Kg) and the lowest was in Green mussel (6.00±1.00 Bq/Kg). The highest annual effective dose from Lamongan in infants with fan shrimp consumption (34.22 μSv/year), in children (10.11 μSv/year) and adults (4.67 μSv/year). The highest annual effective dose from Sukabumi in infants with squid consumption (19.27 μSvyear), in children (5.69 μSv/year) and adults (2.63 μSv/year). This annual effective dose is much lower than the dose range set by The United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), indicating that Indonesia is safe from the radioactive element 210Po. The annual effective consumption dose depends on seafood intake through food plus the community’s habit of always cooking before consuming seafood. This fact must be considered when comparing the annual effective dose between regions or countries and in calculating 210Po contamination in several species of crustaceans and molluscs that are distributed and consumed.
Comparative Analysis of Antioxidant Potential in Hexane and Methanol Fractions of Sungkai Leaves Deswita, Elvira; Imelda, Imelda; Suryati, Suryati
Hydrogen: Jurnal Kependidikan Kimia Vol. 13 No. 3 (2025): June 2025
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v13i3.15692

Abstract

This study aimed to compare the antioxidant potential of hexane and methanol fractions of sungkai (Paronema canescens Jack) leaves from Tanah Datar Regency, West Sumatra, Indonesia. The methanol extract was then fractionated using hexane and ethyl acetate. Total phenolic content was determined using the Folin-Ciocalteu method and antioxidant activity was evaluated using the DPPH (2,2-diphenyl-1-picrylhydrazyl) assay. According to the conducted research, the methanol fraction exhibits a significantly higher total phenolic content, quantified at 92.22 mg GAE/g, in contrast to the hexane fraction, which recorded a content of 25.33 mg GAE/g. Furthermore, the methanol fraction demonstrated robust antioxidant activity, with an IC50 value of 75.425 mg/L, whereas the hexane fraction demonstrated comparatively weaker antioxidant activity, with an IC50 value of 232.595 mg/L. The strong antioxidant activity of the methanol fraction can be attributed to its high content of phenolic compounds, such as flavonoids and tannins, which are known to possess potent antioxidant properties. The synergistic effects of these compounds may further enhance the overall antioxidant capacity of the methanolic fraction. In conclusion, the methanol fraction of sungkai leaves from Tanah Datar Regency demonstrates superior antioxidant potential compared to the hexane fraction, suggesting its potential as a natural source of antioxidants for various applications.
Modifikasi Struktur Akseptor Zat Warna Tipe D-π-A Berbasis Ditiofen sebagai Sensitizer pada Sel Surya Reshiva, Reshiva; Imelda, Imelda; Syukri, Syukri; Admi, Admi; Deswita, Elvira
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.614-622.2025

Abstract

This study aims to evaluate the effect of variations in the acceptor group of dithiophen-based type D-π-A dyes that are efficiently used as sensitizers in DSSC. The calculation uses the 16W Gaussian program with Density Functional Theory (DFT) and Time Dependent-DFT (TD-DFT) methods with the B3LYP/6-31G set base. Based on the results of the study, it is known that acceptor variations can affect the shift in absorption spectrum and bandgap values. The dye AT5 is predicted to have higher efficiency to be used as a sensitizer, because it has the smallest bandgap value and has a dipole moment value, as well as a larger wavelength. The smaller the bandgap value, the absorbedyu light will shift towards the red shift, and the electron excitation process will be easier. It can be concluded that dyes with cyanide formal acceptors can improve the efficiency of D-π-A type dyes as sensitizers in DSSC.