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Penerapan Metode Sonikasi terhadap Adsorpsi Fe(III) pada Zeolit Alam Teraktivasi Rismiarti, Zuri; Yuniati, Yuyun; Alfanaar, Rokiy
ALCHEMY Vol 5, No 2 (2016): ALCHEMY
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.733 KB) | DOI: 10.18860/al.v5i2.3673

Abstract

Iron (III) (Fe (III)) is widely used in the industry such us water treatment, the sugar cane, the concrete industry and coal mining. Industrial activity using Fe(III) has potential impact to environmental pollution problems due to that industry produces Fe waste that one of hazardous waste. Fe content excess might toxic effect to human health and the environment. Zeolite as adsorbent has been evaluated extensively for Fe and other heavy metal. Sonication method has been widely developed in polymer preparation. The method is more effective in operation time because the reaction rate increased and also more efficient on the usage of chemical reagens. The optimization of reaction time, the ratio of Fe(III) with activated zeolite, the influence of pH, and temperature has been assessed for Fe(III) adsorption with an activated zeolite by sonication technique. The formation of Fe(III)-SCN complex assay was used for determination of Fe(III) adsorbed by the activated zeolite with using spectrophotometer. The results showed a relatively short operation time (15 minutes), at pH of 4, temperature of  30 °C with the ratio of 1:50 (weight/volume) for the activated zeolite and Fe(III). 
KARAKTERISASI METODE PAPER ANALYTICAL DEVICE BERBASIS PENCITRAAN DIGITAL UNTUK DETEKSI KADMIUM Rismiarti, Zuri; Indrawati, Renny
CHEMISTRY PROGRESS Vol 10, No 2 (2017)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.10.2.2017.27744

Abstract

ABSTRAK Logam kadmium merupakan logam yang bersifat toksik dan mencemari lingkungan serta mengalami proses biotransformasi dan bioakumulasi dalam organisme hidup (tumbuhan, hewan dan manusia). Ikan merupakan salah satu biota perairan yang dapat terpapar logam Cd sehingga merupakan sumber masuknya logam Cd ke dalam tubuh manusia. Telah banyak ditemukan keracunan bersifat kronis yang terjadi pada manusia seperti kanker disebabkan paparan logam kadmium. Paper analytical device telah dilaporkan sebagai metode yang efektif, sensitid dan telah banyak diaplikasikan dalam logam berat. Penentuan kadmium dengan metode paper analytical device berbasis kolometri dengan teknik pencitraan digital telah berhasil dikembangkan. Metode ini menggunakan kertas Whatmann yang telah dipreparasi, kemudian diteteskan dengan reagen alizarin red s yang berdifusi melewati kapiler kertas hingga membentuk warna kuning kehijauan. Intensitas warna yang terbentuk difoto dengan kamera kemudian dianalisis secara kolorimetri menggunakan program Image J untuk memperoleh absorbansi pada masing-masing warna komplementer merah, hijau, biru. Penelitian memfokuskan pada karakterisasi metode yang akan dikembangkan meliputi optimasi reagen (alizarin red S dan asam sulfat) serta waktu pengukuran. Hasil penelitian menunjukkan konsentrasi optimum dari Alizarin Red S dan H2SO4 masing- masing sebesar 750 ppm dan 0,05 M dengan waktu pengukuran sebesar 10 menit. Kata kunci: Kertas, analisis, kadmium, alizarin red S, pencitraan, digital     ABSTRACT Cadmium (Cd) in trace amounts as a toxicant and an environmental pollutant. The cadmium metal will undergo biotransformation and bioaccumulation processes in living organisms (plants, animals, and humans). Fish is one of the aquatic biotas that can be exposed to Cd metal which is the source of the Cd into the human body. Chronic poisoning that occurs in humans such as cancer caused by exposure to cadmium metal. Paper analytical device (PAD) has been reported as an attractive tool for analysis with good sensitivity and can apply for heavy metal detection. This research using Alizarin Red S reagent as a chelating agent with Cd metal to produce greenish yellow color complex on paper due to sample movement through the capillary paper. The greenish yellow color complex in a paper was photographed with the digital color camera. To produce absorbance data from each complementary color of Red, Green, Blue by colorimetry analysis using Image J software. This research focuses on optimization of the reagent such as alizarin red s, sulfuric acid, and time of measuring. The result showed that optimum concentration of Alizarin Red S is 750 ppm, sulfuric acid of 0.05 M with stability time for over 10 minutes. Keywords: Paper, analysis, cadmium, alizarin red S, digital color image
ELEKTRODA SELEKTIF ION (ESI) TETRABORAT TIPE KAWAT TERLAPIS BERBASIS ZEOLIT Rismiarti, Zuri; ., Atikah; Bisri, Chasan; Irnawati, Yuyun
CHEMISTRY PROGRESS Vol 8, No 1 (2015)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/cp.8.1.2015.9397

Abstract

Telah dibuat dan dikarakterisasi elektro selektif ion (ESI) tetraborat tipe kawat terlapis berbasis zeolit. Hasil penelitian menunjukkan komposisi optimum membran yaitu zeolit : PVC : karbon aktif : DOP (%berat) = 32,3 : 16,1 : 3,2 : 48,4, menghasilkan sifat Nernstian dengan harga faktor Nernst sebesar 29,30 ± 0,28 mV/dekade konsentrasi pada kisaran konsentrasi linier 1x10-5 - 1x10-1M, batas deteksi 3,24x10-6 M (0,619 ppm tetraborat), waktu respon 50 detik, dan memiliki usia pemakaian selama 64 hari. ESI tetraborat bekerja baik pada kisaran pH larutan 7-10 dan temperatur 20-60 0C.A plasticized PVC (polyvinyl chloride) membrane based coated wire tetraborate ion selective electrode has been developed by using zeolite. The results showed the optimum composition of the membrane was zeolite : PVC : activated carbon : DOP 32,3 : 16,1 : 3,2 : 48,4 (%weight). The electrode showed Nernstian response, Nernst factor 29.30 ± 0.28 mV/decade of concentration, with improved linear range of 1x10-5 - 1x10-1 M, with a comparatively lower detection limit of 3.24x10-6 M (0.619 ppm tetraborat), giving a relatively fast respons of 30 second and reasonable reproducibility. ISE’s performance worked well in pH range of 7-10 and temperature range of 20-60 0C. The lifetime of the electrode was found to be 64 days.