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Yohanes Susanto Ridwan
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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PENGGUNAAN BAHAN ACUAN BERSERTIFIKAT OYSTER TISSUE 1566b SEBAGAI INTERNAL QUALITY CONTROL UNTUK MENENTUKAN KADAR TIMBAL TOTAL DALAM TEPUNG IKAN MARLIN DENGAN ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY Willy Cahya Nugraha; Yohanes Susanto Ridwan
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 (521.081 KB) | DOI: 10.14203/jkti.v17i2.29

Abstract

Lead is widely knows as one of the harmful pollutants for humans. Contaminated fishery built by lead may endanger the consumption body. Therefore, contamination monitoring for the fishery products is necessary to be conducted. To ensure the validity of data, Oyster Tissue 1566b certified reference material was used as Internal Quality Control. Marlin fish powder and certified reference materials were analyzed with the same method, personnel, duration or time, equipment and environmental conditions. As the results, it was found that the lead contained in CRM was 0.306 mg.kg-1 with 11.9 % rsd, which is within range of lead content in  the certificate. The method was applied for Marlin Fish. Lead content obtained in this study (1.821 mg.kg-1 with 11.06 % rsd) can be reported with high level of confidence.Keywords: Lead, Certified Reference Materials, Marlin fish
KARBON AKTIF HASIL DEKOMPOSISI TERMAL LIMBAH KERAK CAT BESERTA KARAKTERISASINYA Yohanes Susanto Ridwan
Jurnal Kimia Terapan Indonesia Vol 11, No 2 (2009)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4208.568 KB) | DOI: 10.14203/jkti.v11i2.156

Abstract

Automotive sector which is one of the biggest industry has been producing paint sludge waste in enormous amount that could be dangerous for environment sustainability. To overcome this  problem of course waste treatment approach is important, butsomehow the big investment and operational cost is often become restriction in adopting this kind of approach.Another alternative was to process the paint sludge waste onto more  useful product (recycle). The large fraction of organic material in paint sludge has leaded an opportunity to recycle this waste ontoactivated carbon through thermal decomposition and activation process. Thermal decomposition process in 310°C without activation step has produce activated carbon which has iod number 104.81 mg/g, while the same decomposition process continue with activation step give iod number 91.87 mg/g. These results indicate that paint sludge waste could be recycle onto   activated carbon which not only could reduce the environmentpollution but also could give economical benefit. Another characterization also done by DTA and FTIR to get additional information about the surface topography and chemicalfunctional groups of activated carbonproduced.Keyword: adsorben t, activation, thermaldecomposition, activated carbon, paintsludge
ESTIMASI KETIDAKPASTIAN PADA PENGUJIAN KADMIUM DALAM PRODUK PERIKANAN MENGGUNAKAN GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY Christine Elishian; Willy Cahya Nugraha; Yohanes Susanto Ridwan
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 (612.543 KB) | DOI: 10.14203/jkti.v14i2.330

Abstract

Sumber – sumber ketidakpastian dan penyumbang ketidakpastian terbesar pada pengujian kadarkadmium dalam produk perikanan telah berhasil diidentifikasi melalui estimasi ketidakpastian denganpendekatan “bottom up” menggunakan diagram cause-effect. Sumber - sumber ketidakpastian yang ikutberkontribusi pada pengujian kadmium, yaitu massa sampel, massa larutan, standar larutan induk dan kalibrasi,faktor pengenceran, kadar air, konsentrasi kadmium dalam larutan yang diukur dengan GFAAS, recovery, dan presisi metode. Komponen yang paling mempengaruhi nilai ketidakpastian ini yaitu konsentrasi kadmium dalamlarutan hasil destruksi yang diukur dengan GFAAS yaitu sebesar 0,0452 mg/kg. Konsentrasi logam kadmiumdan ketidakpastiannya dalam produk perikanan yang dilaporkan yaitu 0,273 ± 0,025 mg/kg pada tingkatkepercayaan 95% dan faktor cakupan 2.Kata kunci : Ketidakpastian, Kadmium, Produk Perikanan, GFAAS, Validasi Metode
Co-Authors Christine Elishian Willy Cahya Nugraha