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Rosi Ketrin
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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PENENTUAN LOGAM BESI DAN SENG TOTAL DALAM PRODUK PERIKANAN MENGGUNAKAN FLAME ATOMIC ABSORPTION SPECTROMETRY DAN PENGUKURAN NILAI KETIDAKPASTIANNYA Willy Cahya Nugraha; Christine Elishian; Rosi Ketrin
Jurnal Kimia Terapan Indonesia Vol 16, No 2 (2014)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3300.389 KB) | DOI: 10.14203/jkti.v16i2.9

Abstract

Besi (Fe) dan Seng (Zn) merupakan unsur yang berguna bagi manusia. Keberadaan logam Fe dan Zn dalam produk perikanan yang cukup kecil (trace), mudah tekontaminasi oleh kondisi lingkungan, dan metoda preparasinya yang komplek menyebabkan penentuan logam Fe dan Zn ini cukup sulit, sehingga perlu dicari suatu metoda uji  yang valid dan akurat. Dalam penelitian ini dilakukan pengembangan metoda standar American of Analytical Chemistry (AOAC) tahun 2005 no. 999.10 dengan menggunakan bahan acuan bersertifikat DORM 3 (Fish Protein Certified Reference Material for Trace Metal) dari National Research Council of Canada (NRCC) untuk menguji keakuratan dan ketertelusuran hasil ke Standard Internasional (SI). Metoda ini sudah divalidasi berdasarkan parameter-parameter kimia analitik. Hasil penelitian menunjukkan rata-rata kadar Fe dan Zn dalam sampel perikanan sebesar 178 ±  14 mg.Kg-1  dan 59,8 ±  6,6 mg.Kg-1 (berat kering) dengan faktor cakupan 2 dan tingkat kepercayaan 95%, yang berada pada rentang yang ditentukan 183,5 ± 4,3 mg Kg-1 and 60 ± 1,1 mg Kg-1.Kata kunci : Fe, Zn, trace, CRM, perikanan Iron (Fe) and Zink (Zn) are  essential elements for human being. Determination of this elements in fish products is quite difficult because of Fe and Zn content  in trace level, easy to be contaminated by the environmental conditions, and, complex preparation methods so that it is needed to find a good and accurate method. In this paper, we have developed a standard method from American of Analytical Chemistry (AOAC), 2005, no. 999. using DORM 3 as Certified Reference Materials (CRMs) to check accuracy and traceability’s results to Standard International (SI). The method has been validated according to analytical parameters.  The results showed that means of Fe and Zn concentration in the investigated fish product were 178 ±  14 mg.Kg-1 and 59.8 ±  6,6 mg.Kg-1 respectively with coverage factor 2 and 95%  level of confident, and  in range of expected mass were 183,5 ± 4,3 mg.Kg-1 and 60 ± 1,1 mg.Kg-1in dry basis.Keywords : Fe, Zn, trace, CRM, fisher
EVALUASI PENGGUNAAN CHEMICAL MODIFIER PADA ANALISIS LOGAM DAN SEMI LOGAM DENGAN GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY Rosi Ketrin
Jurnal Kimia Terapan Indonesia Vol 17, No 2 (2015)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (381.463 KB) | DOI: 10.14203/jkti.v17i2.32

Abstract

Graphite Furnace Atomic Absorption Spectrometry (GF-AAS) is not a new method in chemical analysis, especially for metals and metalloids, unfortunately there are a lot of laboratories in Indonesia that still not used it correctly, whereas if used it correctly, the method will be an excellent and can be a reference method. This review focus on the kinds of interferences in the GF-AAS such as spectral, physic and chemical interferences and alsoon the use of a lot of kinds of chemical modifier that very important part in analysis by GF-AAS, however it is often unused because of the difficulty. It is noted that highest absorption level from each analyte is different even though used the same modifier and ashing temperature, therefore the selection of chemical modifier is important to find the appropriate modifier for each analyte and their matrixes.Keyword: GF-AAS, spectral interferences, physic interferences, chemical interferences, chemical modifier
PENGEMBANGAN MATERIAL SERBUK SILIKA UNTUK IDENTIFIKASI SIDIK JAR! Christine Elishian; Rosi Ketrin
Jurnal Kimia Terapan Indonesia Vol 13, No 1 (2011)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4901.382 KB) | DOI: 10.14203/jkti.v13i1.126

Abstract

Development of powder material for fingerprint identification has become Indonesian Department of Safety and Defense priority, especially it was written in the National Research Agenda 2006 -2009. Until now Indonesia still imported thepowder from United States and Japan. Powder fineness is one of the important factors, because finer the powder, more easily it stick to the latent fingerprint and better visualization result will be obtained. In this research, nanosilica was fabricated by used TEOS (tetraethoxysilane) as precursor. Nanosilica is an adhesive material in fingerprint powder while carbon is a coloring agent. In this research nanosilica and carbon black composition was optimized, and the powders were characterized and tried in order to get afingerprint powder which have a better quality to be used by National Police and therefore it can support Indonesian autonomy in safety and defense.Key words: Fingerprint identifier material, nanosilika, TEOS, carbon black
PENENTUAN KADMIUM DALAM PRODUK PERIKANAN DENGAN GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY Willy Cahya Nugraha; Christine Elishian; Rosi Ketrin
Jurnal Kimia Terapan Indonesia Vol 14, No 2 (2012)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.631 KB) | DOI: 10.14203/jkti.v14i2.337

Abstract

Penentuan kadmium dalam produk perikanan telah dilakukan menggunakan Graphite Furnace AtomicAbsorption Spectrometry (GF-AAS) dengan magnesium nitrat sebagai matrix modifier, platform atomizationtype A dengan sensitifitas yang tinggi untuk pengukuran kadmium, dan koreksi latar belakang Zeeman. Metodeanalisis  telah  divalidasi  berdasarkan  parameter-parameter  kimia  analitik.  Sebanyak  0,5  g  sampel  produkperikanan didestruksi menggunakan microwave digestion systems dengan menambahkan 5 mL asam nitrat pekatdan 2 mL hidrogen peroksida 30%, kemudian larutan hasil destruksi diencerkan hingga 25 g. Dari larutan inidibuat sederet larutan untuk pengukuran secara adisi standar, dan diukur dengan GF-AAS. Akurasi metodedilakukan dengan menganalisis bahan acuan bersertifikat  DORM 3 Fish Protein Certified Reference Materialfor Trace Metals dari National Research Council Canada dengan nilai recovery sebesar 99,9 ± 0,8%. Dari hasilpenelitian ini diperoleh kadar kadmium dan ketidakpastiannya sebesar 0,273 ± 0,025 mg kg-1berdasarkan beratkering.Kata kunci: GF-AAS, Microwave digestion systems, kadmium, validasi metoda
Co-Authors Christine Elishian Christine Elishian Willy Cahya Nugraha