10 research outputs found

    Electrochemical degradation of methylene blue using Ce(Iv) ionic mediator in the presence of Ag(I) ion catalyst for environmental remediation

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    Methylene blue (MB) is often used in textile industries and is actively present in the wastewater runs-off. Recently, mediated electrochemical oxidation (MEO) offers a fast, reliable and promising results for environmental remediation. Thus, we aimed to evaluate the electro-degradation potential of MB by MEO using Ce(IV) ionic mediator. Furthermore, we also observed the influence of addition Ag(I) ion catalyst in MEO for degradation of MB. The electro-degradation of MB was evaluated by cyclic voltammetry technique and was confirmed by UV-Vis spectrophotometry, high performance liquid chromatography (HPLC) analysis and back-titration analysis. The results showed that in the absence of Ag(I) ion catalyst, about 89 % of MB was decolorized within 30 min. When 2 mM of Ag(I) ion catalyst was applied, the electro-degradation of MB was increased to maximum value of 100%. The UV-Vis spectrum confirmed the electro-degradation of MB as suggested by decreased maximum absorbance value at λ 668 nm from 2.125 to 0.059. The HPLC analysis showed the formation of five new peaks at retention time of 1.331, 1.495, 1.757, 1.908, and 2.017 min, confirming the electro-degradation of MB. The back-titration analysis showed about 52.9% of CO2 was produced during electro-degradation of MB by MEO. More importantly, more than 97% of Ce(IV) ionic mediator were recovered in our investigation. Our results showed the potential of MEO using Ce(IV) ionic mediator to improve the wastewater runs-off quality from textile as well as other industries containing methylene blue

    Eksplorasi Kadar Kalsium (Ca) dalam Limbah Cangkang Kulit Telur Bebek dan Burung Puyuh Menggunakan Metode Titrasi dan AAS

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    Telur merupakan makanan yang populer di masyarakat Indonesia. Dalam telur, terkandung protein dan gizi yang dipercaya baik bagi kesehatan. Dalam cangkang telur juga terkandung kalsium dengan kadar yang cukup tinggi. Namun disisi lain, banyaknya telur yang dikonsumsi masyarakat menghasilkan limbah cangkang telur yang semakin banyak. Penelitian ini bertujuan untuk menganalisis kadar kalsium dalam cangkang telur ayam, telur bebek, dan telur puyuh menggunakan metode instrumentasi yaitu AAS dan konvensional yaitu menggunakan teknik titrasi. Hasil penelitian menunjukkan bahwa analisis kalsium dalam cangkang telur yang direbus menunjukkan bahwa kadar kalsium pada telur ayam kampung, telur bebek, dan telur puyuh secara berturut-turut adalah 35,2%, 38,1%, dan 46,8% dengan metode titrasi. Analisis kalsium dengan metode titrasi dalam cangkang telur yang tidak direbus menunjukkan hasil untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurut-turut adalah 52,8%, 77,3%, dan 66,13%. Sedangkan analisis kalsium pada cangkang telur yang direbus menggunakan metode instrumen AAS untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurutan adalah 25,25%, 26,78%, dan 28,73%. Analisis kalsium pada cangkang telur yang tidak direbus menggunakan metode instrumen AAS untuk telur ayam kampung, telur bebek, dan telur puyuh secara berurutan adalah 26,92%, 28,56%, dan 33,23%

    Organic micropollutants content in sediments and biotas (Polymesoda erosa and Perna viridis) from Jakarta Bay and Segara Anakan Lagoon, Indonesia

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    Les activités anthropiques ainsi que des phénomènes naturels sont à l’origine de risques avérés pour l’environnement. L'Indonésie est un pays archipélagique qui contient de nombreuses îles et régions côtières, où la croissance exponentielle des activités anthropiques a exposé l’environnement indonésien à de graves détériorations au cours des dernières décennies. Cette étude vise à explorer (qualitativement et quantitativement) les niveaux de contamination des sédiment de surface et du biote (P. Viridis, P. erosa,) au travers de deux sites atelier : la baie de Jakarta et la lagune de Segara Anakan (Java, Indonésie).Les méthodes de préparation des échantillon (extraction par solvant puis purification par chromatographie d’adsorption) suivies de l’analyse des extraits par GC/MS/MS ont été développées et qualifiées (linéarité, spécificité, reproductibilité).Les n-alcanes, HAP, PCBs et OCs sont détectés à des teneurs pouvant atteindre respectivement 1935 µg/kgPS, 916 µg/kg PS, 116,49 µg/kg PS, et 16,70 µg/kg PS, dans des sediments et 1739 µg/kg PS des HAPs et 24,79 µg/kg PS des OCs dans le biote. Les hydrocarbures, comme les HAPs sont majoritairement d’origine pétrolière (fuites, transport utilisation) même si la contribution pyrolytique est toujours présente.L’évaluation du risque environnemental a été réalisés pour les HAP, PCBS et et les OCs en utilisant les lignes directrices de la qualité des sédiments (RQS). Ces données peuvent servir de référence de base dans le cadre du programme de gestion intégrée des bassins versants impliquant la biodiversité, l'écologie de l'eau douce, et l'activité économique dans le domaine de cette étude.Environmental problems can increase due to anthropogenic activities or natural phenomena. Indonesia is an archipelagic country that consists of many islands and coastal regions, where the growth of anthrophogenic and natural activities has exhibited severe environmental degradation in the past few decades. This study aims to explore (both qualitatively and quantitatively) the extent and sources of organic contaminants, i.e., n-alkanes in surface sediments; PAHs, PCBs and OCs in sediments and mussels, P. viridis from Jakarta Bay, North Jakarta, and P. erosa from the Segara Anakan Lagoon. Each protocol was continued with qualitative and quantitative analysis by GC-QQQ(triple-quadropole)/MS. Matrix interferences have been evaluated with proper samples with suitable yield of extraction and analysis. The n-alkanes, PAHs, PCBs and Organochlorin pesticides are detected in the highest levels in sediments, respectively 1935 µg/kg dw, 916 µg/kg dw, 116,49 µg/kg dw, and 16,70 µg/kg dw. In addition, the highest levels of PAHs (1739 µg/kg dw) and OCs levels (24,79 µg/kg dw) were found in biota. The source of hydrocarbons source, such the PAHs were generalelly petroleum source (transport utilization) although the pyrolytic are still present in sediments and biota. Environmental risk assessment from sediment quality guidelines (SQGs) were used to evaluate the probability risk in marine environments. Besides SQGs, sediments and mussels also in regard to the extent of the PAHs, PCBs and OCs (i.e. pp’-DDE) have been compared to other studies conducted at some polluted sites

    Mini-Ulasan Adsorpsi Anthrasena, Fenanthrena dan Fluorena menggunakan Material Berbasis Karbon Berpori, Silika dan Zeolit

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    Senyawa Polisiklik Aromatik Hidrokarbon (PAH) merupakan salah satu senyawa polutan organik yang bersifat karsinogen, mutagen dan teratogen pada organisme, sehingga dapat bertahan dalam air untuk waktu yang lama. Antrasena, Fenantrena, dan Fluorena adalah jenis PAH yang banyak dihasilkan dari limbah industri. Penghilangan senyawa PAH dilakukan dengan metode adsorpsi sebagai metode paling efektif untuk pengolahan air yang tercemar karena biaya yang rendah, sederhana dan monitoring  kandungan polutan. Pada penelitian ini telah dilakukan studi literatur terhadap adsorpsi PAH dengan berbagai adsorben bahan karbon berpori seperti Karbon Aktif, Biochar dan Graphene dan adsorben bahan mesoporus Silika seperti PMO, MCM-41, NH2-SBA-15, dan klinoptilolit (zeolite). Terdapat beberapa faktor yang mempengaruhi kemampuan adsorpsi dari Karbon aktif dan silika seperti luas permukaan spesifik, ukuran pori dan volume pori adsorben. Parameter adsorpsi PAH dengan karbon aktif dan silika yang diperoleh seperti pH dalam rentang 2-12, waktu kontak 1-24 jam, suhu 20-45°C, konsentrasi PAH 2-60 mg/L memberikan acuan rentang spesifik dalam mengevaluasi kinerja adsorpsi PAH dengan adsorben yang digunakan

    Paremeter optimasi Xylenol Neodimium -Polime bercetakan (Nd-IPs) untuk adsoprsi ion Neodimium (III)

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    Performance evaluation of metal Neodymium Imprinted Polymers (Nd-IPs) through the polymerization of methyl metaacrylate with divinyl benzene in the presence of a metal complex Nd(III)-Xylenol Orange (XO) has been investigated. The adsorption capability towards Nd(III) ion were optimized based on ion retention parameters, such as pH, contact time, concentration, adsorption isotherm, and kinetic studies. The synthesized Nd-IPs obtained Nd(III) adsorption capacity reached 30.36 mg.g-1 at a pH of 5 with 20 minutes contact time. The isotherm studies showed the preference of Freundlich isotherm over Langmuir isotherm. The selectivity coefficient of Nd-IPs to ion Nd+3/La+3 are 1.35 and 1.38, then selectivity coefficient value obtained 1.35 and 1.40 for Nd+3/Y+3

    Degradation of nonylphenol ethoxylate-10 (NPE-10) by mediated electrochemical oxidation (MEO) technology

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    Nonylphenol ethoxylate (NPE-10) is a non-ionic surfactant that is synthesized from alkylphenol ethoxylate. The accumulation of NPE-10 in wastewater will endanger the ecosystem as well as the human being. Nowadays, NPE-10 can be degraded indirectly by using an electrochemical treatment by the advancement of technology. Thus, this study is aimed to evaluate the electro-degradation potential of NPE-10 by MEO using Ce(IV) ionic mediator. In addition, the influence of Ag(I) ionic catalyst in the performance of MEO for the degradation of NPE-10 was also observed. The potency of MEO technology in the NPE-10 degradation was evaluated by voltammetry technique and confirmed by titrimetry and LC-MS analysis. The results showed that in the absence of Ag(I) ionic catalyst, the degradation of NPE-10 by MEO was 85.93%. Furthermore, when the Ag(I) ionic catalyst was applied, the performance of MEO in degradation of NPE-10 was improved to 95.12%. The back titration using Ba(OH)2 confirmed the formation of CO2 by 46.79%, whereas the redox titration shows the total of degradation organic compounds by 42.50%. It was emphasized by the formation of two new peaks in the LC-MS chromatogram. In summary, our results confirmed the potential of MEO technology for the NPE-10 degradation

    ANALISIS KANDUNGAN KAFEIN DALAM KOPI TRADISIONAL GAYO DAN KOPI LOMBOK MENGGUNAKAN HPLC DAN SPEKTROFOTOMETRI UV/VIS

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    Kafein merupakan senyawa turunan alkaloid yang dapat ditemukan dalam kopi, teh dan minuman kemasanlainnya. Kelebihan kafein dapat menyebabkan sakit kepala, munculnya perasaan was-was dan cemas, serta dapatmenimbulkan gangguan pada lambung dan pencernaan. Oleh karenanya sangat dianjurkan untuk tidakmengonsumsi kafein melebihi batas yang diperbolehkan. Penduduk Indonesia sangat dominan mengonsumsikopi dan kini kopi tradisional di tiap daerah telah menjadi khas utama suatu daerah seperti kopi Gayo yangberasal dari Aceh dan kopi Lombok. Minimnya informasi kandungan kafein dalam kopi tradisional, berakibattidak terkontrolnya konsumsi kafein pada para penikmat kopi tradisional. Penelitian ini bertujuan untukmenganalisis kandungan kafein dalam kopi tradisional Gayo dan Kopi Lombok. Metode analisis yang dilakukanyaitu dengan HPLC dan Spektrofotometri UV/VIS. Kandungan kafein dalam kopi tradisional tersebut kemudiandibandingkan dengan kopi kemasan sebagai kontrol. Hasil analisis menggunakan UV/VIS dan HPLCmenunjukkan bahwa kandungan kafein pada kopi tradisional (gayo & Lombok) memiliki kadar kafein yanglebih rendah dibandingkan dengan kopi kemasan. Dari analisis UV/VIS diketahui bahwa kadar kafein pada kopigayo, kopi Lombok dan kopi kemasan adalah 9,70 mg/gram, 14,24 mg/gram dan 14,97 mg/gram. Sedangkanberdasarkan analisis menggunakan HPLC kadar kafein pada kopi gayo, kopi Lombok dan kopi kemasan adalah8,10 mg/gram, 14,07 mg/gram dan 14,08 mg/gram

    Evidence of Micropollutants in Sediment and Mud Clams ( Polymesoda erosa ) from One of Mangrove Biodiversity Hotspots in Indonesia

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    International audienceThis study aims to explore persistent microorganic pollutants (Poly chloro byphneyls (PCBs) and Organochlorine Pesticides (OCPs)) in sediment and mud clams (Polymesoda erosa) in Segara Anakan Lagoon (SAL). In addition, polycyclic aromatic hydrocarbons (PAHs) in the mud clams were evaluated their risk consumption and Bioaccumulation factor in sediment. Concentrations of seven PCBs in the sediment were found in the range 0.11 ± 0.05 to 2.63 ± 0.1 μg kg−1 sed dw. OCPs levels were found in the range of 0.2 ± 0.05 and 2.9 ± 0.01 μg kg−1 sed dw. In P. erosa, 16 Polycyclic Aromatic Hydrocarbons (PAHs) (USEPA) were found in the range from 103.34 ± 2.01 to 1348.31 ± 18.21 μg kg−1 tissue dry weight (dw), PCBs content was found only in one station at concentration 2.34 ± 1.72 μg kg−1 tissue dw and OCPs content was found in the range 0.87 ± 0.03 to 24.79 ± 1.30 μg kg−1 tissue dw. The disturbance matrices have been evaluated with the appropriate samples according to the extraction yield and yield analysis. Several guidelines evaluate the quality of sediment on PCBs and OCPs (i.e. pp-DDE). The consumption evaluation shows that this mud clam P. erosa has been contaminated of PAHs and not recommended for human consumption. They were potentially as site-specific bioaccumulation in sediment for organic micropollutants which receives from any untreated sewage, industrial waste discharge into the canal system of river of Segara Anakan Lagoon

    Organic Pollutants Hazard in Sediments and Green Mussels in Jakarta Bay, Indonesia

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    International audienceOrganic pollutants (PAHs, PCBs, and organochlorine pesticides (OCPs) from sediments and Asian green mussels (Perna viridis) in Jakarta Bay were studied using GC-MS/MS. The PAHs concentration in the sediments ranged from 186.64 to 915.71 µg.kg−1 per sediment dry weight (dw), while the PCBs and the OCPs concentration ranged from 3 to 117 µg.kg−1 and 3 to 17.99 µg.kg−1 per sediment dw, respectively. For the P. viridis, 16 types of PAHs concentration ranged from 591 to 997 µg.kg−1 per dw of mussels, while the OCPs concentration varied from 5 to 6 µg.kg−1 per dw of mussel. The selected PAHs ratios, including Ant/∑178, Fl/∑202, BaAnt/∑228, and IPyr/∑276, potentially showed that the sources of the hydrocarbons in sediments were generally biogenic and terrigenous than for mussels were petroleum source. The concentration of PAHs in mussels was higher than sediments, meanwhile the organic pollutant contains chlorine (PCBs and OCPs) were potentially found in sediments. The reclamation, urban and mangrove areas (stations G and H) in this study found more high risk of than other sampling stations of sediments and mussels. According to the environmental risk assessment parameters (TEL, ERM, and ERL) from the sediment quality guidelines, the stations have various potential ecological risks. P. viridis was shown to be highly contaminated in polluted stations (except station A) that were not recommended for consumption (>200 µg.kg−1 tissue dw)
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