Judul: Electrochemical Sensor for Detection of Chlorotalonil Residue in Grapes
Abstrak: The use of chlorothalonil in grapes as a pest control agent, could bring potential harm for health and the environment. Therefore it is necessary to test the residue of chlorothalonil pesticides in grapes as part of food safety control. Pesticide residue testing generally uses HPLC, GC-MS/MS dan LC-MS/MS. Although have high sensitivity, these technique require very expensive equipment, long analysis times, high sample volumes of reagents and competent testing personnel. Meanwhile, pesticide residues testing in the field generally required fast procedure, portable, and easy to use. Therefore, this research aims to develope testing methods for chlorothalonil pesticide residues with electrochemical sensors which can be an alternative method for testing chlorothalonil pesticide residues in grapes. In this study, a differential pulse voltammetry (DPV) technique was chosen using a glassy carbon electrode (GCE) with graphene oxide (GO) and poly 3,4- ethylenedioxythiopene (PEDOT:PSS). In this study GO synthesis was carried out using the modified Hummers method. The characterization results using Raman and FTIR spectroscopy showed the successful synthesis of GO from graphite. The results showed that the modified GCE treatment GO/PEDOT:PSS was significantly different from the unmodified GCE (p<0,05). The addition of composites to the modified electrode improved the performance of the sensor in detecting chlorothalonil. Meanwhile, the peak current of chlorothalonil reduction in GCE modified with GO and PEDOT:PSS composites with various ratios gave results that were not significantly different (p>0,05). Furthermore, the GO/PEDOT:PSS composite ratio (1:1) was determined as the best composite composition in this study. Chlorothalonil is only slightly soluble in Britton Robinson Buffer (BRB), so it is necessary to explore the use of electrolyte combinations with organic solvents. In this experiment, the ratio of BRB:ACN (1:1) was the optimum electrolyte ratio and pH 9 as the optimum pH. Analytical performance parameters observed in this study were reproducibility and stability resulted in %RSD < 5% which shows acceptable results. Based on the result of selectivity test from GCE/GO/PEDOT:PSS was selective for chlorothalonil from interferences such as ascorbic acid, calcium, calium, magnesium, natrium, and sucrose with the effect result of interference to chlorothalonil has not significantly different (p>0,05). In addition, there was a linear relationship in the chlorothalonil concentration range of 10-200 µM with a correlation coefficient of 0,9966 and a detection limit was 3 µM and a quantitation limit was 8 µM. Good accuracy was also demonstrated by the %recovery obtained from 97.77 – 103,61% and successful detection of chlorothalonil in grapes by the standard multiple point addition method of 273 µM or equivalent to 29,03 mg/kg. As a result of the confirmation test using GC-MS/MS, the detection result of the residual concentration of chlorothalonil in the grapes was 0.03 mg/kg. The measurement result of the electrochemical method were higher and significantly different from those with GC-MS/MS. The concentration values detected in this experiment were quite high above the allowable MRL (Maximum Residu Limit) and still give the respon false positive result. This is possible due to the interference of the complex matrix effect in the grape samples. Optimizing this electrochemical test, require a more extensive matrix effect test. However, the electrochemical
Keyword: Chlorothalonil, electrochemical sensor, graphene oxide, pesticide

Judul: Rapid test for organophosphate and organochlorine insecticide residues with digital multimeter
Abstrak: Pengembangan metode untuk pemantauan residu pestisida di lapangan yang cepat, akurat, serta murah sangat dibutuhkan, salah satunya dengan alat multimeter digital. Metode pengujian ini berdasarkan adanya perbedaan tahanan arus yang dimiliki oleh berbagai bahan aktif. Nilai hasil pengujian standar dan contoh divalidasi dengan beberapa parameter, yaitu linearitas, ketepatan, ketelitian, dan batas deteksi. Validasi metode yang dilakukan pada insektisida klorpirifos, diazinon, dan diklorvos dari golongan organofosfat serta DDT, aldrin, dan heptaklor dari golongan organoklorin dalam contoh sayuran bawang merah, cabai merah, dan kubis, memberikan ketelitian dan batas deteksi yang cukup baik. Akan tetapi, linearitas dan ketepatannya masih kurang baik. Berdasarkan hasil ini, metode analisis residu pestisida dalam sayuran dengan bantuan multimeter digital berpotensi untuk dikembangkan sebagai metode pengujian, dengan melakukan beberapa perbaikan pada tahap ekstraksi contoh. Kata kunci: multimeter digital, organofosfat, organoklorin, pestisida, validasi, Development of rapid, acurate, and affordable method for monitoring of insecticide residues in the field is a need, for example is by using digital multimeter. This testing method is based on the various current resistance of the active components. Testing results of pesticide standards and samples were validated by several parameters, namely linearity, accuracy, precision, and limit of detection. The method validation performed on chlorpyrifos, diazinone, and dichlorvos from the organophospate group as well as DDT, aldrine, and heptachlor from the organochlorine group in onion, chilli, and cabbage, gave good results for precision and limit of detection. However, the linearity and accuracy were still below the acceptable requirements. These results show that the analytical method of pesticide residues in vegetables by means of a digital multimeter has the potential to be used as a test method, by improving the extraction phase of samples. Key words: digital multimeter, organochlorine, organophosphate, pesticide, validation
Keyword: multimeter digital, organofosfat, organoklorin, pestisida, validasi

Judul: Portofolio Investasi PT Asuransi Takaful Keluarga
Abstrak: Sejak krisis ekonomi terjadi di Indonesia pada tahun 1997, lembaga keuangan syariah yang dianggap sebagai sistem altenatif mengalami perkembangan pesat, baik dari segi jumlah lembaga, aset maupun regulasi yang mengaturnya. Salah satu lembaga keuangan tersebut adalah asuransi. PT Asuransi Takaful Keluarga sebagai asuransi syariah pertama di Indonesia mengalami perkembangan bisnis yang mengesankan, hal ini dapat dilihat dari semakin meningkatnya aset perusahaan dan premi bruto dari tahun ke tahun. Untuk mendayagunakan dana-dana yang dikelola, PT Asuransi Takaful Keluarga menginvestasikan asetnya ke beberapa jenis investasi dengan membentuk portofolio. Pada tahun 2002, terjadi peningkatan jumlah investasi sebesar 18,62 persen dibandingkan tahun sebelumnya, namun kenaikan tersebut tidak meningkatkan jumlah pandapatan investasi. Pada tahun yang sama jumlah pendapatan investasi justru turun 59,9 persen.
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