SHYNTA RAMADHAN, . (2022) ANALISIS KADAR LOGAM KOBALT (Co) DALAM MEDIUM AIR MENGGUNAKAN TEKNIK ELEKTROKIMIA. Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.
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Abstract
Pada penelitian ini, dilakukan penentuan kadar pada ion logam kobalt (Co) dalam sampel limbah menggunakan metode cyclic voltammetry. Kadar kobalt perlu diketahui secara pasti karena dilingkungan perairan dapat terakumulasi dan dapat membahayakan semua komponen biotik. Penelitian ini bertujuan untuk menentukan pengaruh rentang tegangan, scan rate, dan pH dalam penentuan kondisi pengukuran ion logam kobalt secara siklik voltametri. Elektroda kerja yang digunakan adalah platina, Ag/AgCl sebagai elektroda pembanding dan kawat paltina sebagai elektroda pendukung. Parameter pengukuran yang meliputi rentang tegangan, scan rate, dan pH. Hasil pengkuran menunjukan rentang tegang pada 0,75V sampai -1,5V, scan rate 200 mV/s, dan pH 7. Selanjutnya dilakukan validasi rentang konsentrasi linier, limit deteksi, limit kuantisasi dan keberulangan pengukuran. Linieritias larutan standar Co berada pada rentang 10 sampai 30 mM, dengan koefisien korelasi 0,9992. Limit deteksi dan limit kuantitasi berturut-turut 217,06 mg/L dan 723,5 mg/L. Kedapatan ulangan yang baik ditunjukkan dengan RSD sebesar 0,9%. Kadar Co pada sampel limbah yang diperoleh dengan metode voltametri siklik sebesar 648,4 mg/L yang sesuai dengan hasil yang diperoleh dari pengukuran AAS yaitu 510,70 mg/L. Kadar logam Co(II) yang terukur pada kedua metode tersebut melebihi ambang batas maksimum baku mutu logam Co menurut Peraturan Menteri Lingkungan Hidup dan Kehutanan Tahun 2020. ***************************************************** In this study, the concentration of metallic cobalt (Co) ions in waste samples was determined using the cyclic voltammetry method. Cobalt levels need to be known with certainty because in the aquatic environment it can accumulate and can harm all biotic components. This study aims to determine the effect of voltage range, scan rate, and pH in determining the conditions for measuring cobalt metal ions by cyclic voltammetry. The working electrode used is platinum, Ag/AgCl as a comparison electrode and platinum wire as a supporting electrode. The optimized measurement parameters include voltage range, scan rate, and pH. The optimization results show a voltage range of 0.75V to -1.25V, a scan rate of 200 mV/s, and a pH of 7. Furthermore, validation of the linear concentration range, detection limit, quantization limit and measurement repeatability was carried out. The linearity of the Co standard solution is in the range of 10 to 30 mM, with a correlation coefficient of 0.9992. The detection limit and quantitation limit are 217.06 mg/L and 723.5 mg/L, respectively. Good test results are indicated by an RSD of 0.9%. The concentration of Co in the waste sample obtained by the cyclic voltammetry method was 648.4 mg/L which was in accordance with the results obtained from the AAS measurement of 510.70 mg/L. The levels of Co(II) metal measured in the two methods exceed the maximum threshold for Co metal quality standards according to the 2020 Minister of Environment and Forestry Regulation.
| Item Type: | Thesis (Sarjana) |
|---|---|
| Additional Information: | 1). Dr. Setia Budi, M.Sc. ; 2). Dr. Yusmaniar, M.Si. |
| Subjects: | Sains > Kimia |
| Divisions: | FMIPA > S1 Kimia |
| Depositing User: | PKL . |
| Date Deposited: | 19 Nov 2024 02:37 |
| Last Modified: | 19 Nov 2024 02:37 |
| URI: | http://repository.unj.ac.id/id/eprint/52141 |
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