Anggarini, Ufafa (2011) Pengaruh Konsentrasi Asam Nitrat pada Penentuan Selenium dalam Beras Merah secara Spektroskopi Emisi Atom (ICP-AES). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penentuan kadar selenium dalam beras merah dapat dilakukan dengan menggunakan metode spektrofotometri emisi atom (ICP-AES). Cuplikan beras merah dipreparasi dengan asam nitrat dengan menggunakan mikrowave digester. Pengaruh konsentrasi asam nitrat sebagai asam pendestruksi dipelajari dalam penelitian ini. Konsentrasi asam nitrat yang digunakan dalam penelitian ini antara lain adalah 1.9, 3.9, 5.9, 7.5, 11.9, dan 15.6 M. Penentuan selenium dilakukan dengan konsentrasi asam nitrat yang mampu menghasilkan intensitas maksimum pada penentuan dengan ICP-AES. Pada penentuan selenium intensitas maksimum dapat dicapai dengan menggunakan asam nitrat 5.9 M sebagai asam pendestruksi. Validasi metode diuji dengan penentuan prosen recovery. Prosen recoveiy dilakukan dengan metode standar adisi. Prosen recovery pada beras merah jenis aek sibundong adalah sebesar 95.9244% sampai dengan 104.2697%, sedangkan prosen recoveiy untuk beras merah jenis slegreng adalah sebesar 95.1439% sampai dengan 104.4423%. Kadar ratarata selenium dalam beras merah jenis aek sibundong adalah 73.8125 mg/kg dengan standar deviasi (SD) 1.1157 dan koefisien keberagaman (CV) sebesar 1.5115%, sedangkan rata-rata kadar selenium dalam beras merah jenis slegreng adalah 74.2683 mg/kg dengan SD sebesar 1.3243 dan CV sebesar 1.7831%.
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The concentration of Selenium in Red Rice can be determined by Inductively Coupled Plasma-Atomic Emission Spectroscopy methods (ICP-AES). Samples of red rice were prepared with nitric acid in microwave digester. The effect of nitric acid concentration as digester has been investigated in this research. The nitric acid concentrations used in this study are 1.9, 3.9, 5.9, 7.5, 11.9, and 15.6 M. Determination of selenium was performed with nitric acid concentration which gives maximum intensity on the determination by ICP-AES. In determination of selenium, maximum intensity can be achieved using 5.9 M nitric acid as digester. Validation of the method was investigated by determining percent recovery. Percent recovery was determined by standard addition method. Percent recovery of red rice type Aek sibundong is 95.9244% to 104.2697%, whereas percent recovery in slegreng is 95.1439% to 104.4423%. The average concentration of selenium in aek sibundong is 73.8125 mg/kg with standard deviation (SD) and coefficient of variation (CV) are 1.1157 and 1.5115%, respectively. Whereas the average concentration of selenium in slegreng is 74.2683 mg/kg with SD and CV are 1.3243 and 1.7831%, respectively.
| Item Type: | Thesis (Other) |
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| Additional Information: | RSKi 543.52 Ang p |
| Uncontrolled Keywords: | Selenium, beras merah, asam nitrat, preparasi mikrowave digester, ICP-AES, Selenium, red rice, nitric acid, microwave digester preparation, ICP-AES. |
| Subjects: | Q Science > QD Chemistry > QD481 Chemical structure. |
| Divisions: | Faculty of Mathematics and Science > Chemistry > 47201-(S1) Undergraduate Thesis |
| Depositing User: | magang . |
| Date Deposited: | 19 Oct 2026 02:20 |
| Last Modified: | 19 Oct 2026 02:20 |
| URI: | http://repository.its.ac.id/id/eprint/145663 |
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