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All Journal CHEMISTRY PROGRESS Jurnal Sains Dasar Alchemy : Journal of Chemistry Jurnal Ilmu Kimia Universitas Brawijaya UNEJ e-Proceeding Science and Technology Indonesia Jurnal Penelitian Pendidikan IPA (JPPIPA) Indonesian Journal of Chemistry Jurnal Kartika Kimia Makara Journal of Science
Qonitah Fardiyah
Department Of Chemistry, Faculty Of Mathematic And Natural Science, Brawijaya University, Malang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Environmental Science Materials Science & Nanotechnology Physics

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PENGARUH ION ASING TERHADAP KINERJA ELEKTRODA SELEKTIF ION (ESI) Cd(II) TIPE KAWAT TERLAPIS BERBASIS D2EHPA SERTA APLIKASINYA PADA PENENTUAN KADAR KADMIUM DALAM AIR SUNGAI Wijanarko, Aris; Atikah, Atikah; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 2 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Elektroda Selektif Ion (ESI) Cd(II) tipe kawat terlapis dibuat menggunakan bahan aktif D2EHPA, campuran polivinilklorida (PVC) sebagai bahan pendukung, Dibutylphthalate (DBP) sebagai bahan pemlastis, dengan perbandingan D2EHPA : PVC : DBP = 16 : 28 : 56 dalam pelarut tetrahidrofuran (THF) (1:3 b/v). ESI Cd(II) tipe kawat terlapis berbasis D2EHPA menunjukkan harga faktor Nernst 27,26 mV/dekade konsentrasi Cd(II) pada rentang konsentrasi 1x10-5 – 1x10-1 M, limit deteksi 6,61x10-6 M atau setara dengan 0,317 ppm kadmium dengan waktu respon 40 detik dan usia pemakaian 42 hari. Penelitian ini bertujuan untuk mempelajari pengaruh ion asing terhadap kinerja ESI Cd(II) tipe kawat terlapis berbasis D2EHPA serta diaplikasikan pada penentuan kadar kadmium dalam air sungai. Pengaruh ion asing dilakukan dengan menentukan koefisien selektivitas (Ki,j) menggunakan metode larutan tercampur. Larutan yang diukur mengandung ion utama Cd2+dengan rentang konsentrasi 1x10-5 – 1x10-1 M dan ion asing Hg2+dan Cu2+dengan konsentrasi tetap 1x10-3 M. Aplikasi pada penentuan kadar kadmium secara potensiometri menggunakan ESI Cd(II) tipe kawat terlapis berbasis D2EHPA hasilnya dibandingkan dengan metode standar Spektrofotometer Serapan Atom (SSA)  menggunakan uji t. Hasil penelitian menunjukkan keberadaan ion asing Hg2+ dan Cu2+ tidak mempengaruhi kinerja ESI Cd(II). Urutan selektivitas ESI Cd(II) tipe kawat terlapis berbasis D2EHPA yaitu Cd2+ > Hg2+ > Cu2+, Berdasarkan hasil uji t pengukuran Cd(II) menggunakan metode potensiometri dengan ESI Cd(II)tipe kawat terlapis berbasis D2EHPA tidak berbeda secara bermakna dengan hasil pengukuran menggunakan metoda SSA sehingga dapat digunakan sebagai metoda alternatif untuk  pengukuran kadar kadmium dalam air sungai. Kata kunci: D2EHPA, elektroda selektif ion tipe kawat terlapis, membran, potensiometri, sensor potensiometri kadmium.
PEMBUATAN DAN KARAKTERISASI ELEKTRODA SELEKTIF ION (ESI) TIMBAL (II) TIPE KAWAT TERLAPIS BERBASIS PIROPILIT Daninda, Mahani; Fardiyah, Qonitah; Sabarudin, Akhmad
Jurnal Ilmu Kimia Universitas Brawijaya Vol 2, No 1 (2013)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRACT Pyrophyllite as an inorganic material having an active site that can serve as an ion exchanger, so that potentially to be used as ionophore ion selective membrane. Ion Selective Electrode (ISE) lead (II)-based on pyrophyllite as an ionophore, Polyvinylchloride (PVC) as the matrix polymer, activated carbon and dioktilftalat (DOP) as a plasticizer in tetrahydrofuran solven has been developed. Variables of this research consist of immertion time doing at 10, 20, 30, 40, 50, 60, 70, 80 minutes and composition of the membrane. Basic characterization of ion ISE Lead (II) coated wire based on pyrophyllite were examined Nernst Factor, limit of detection, linear concentration range, response time, and life time. The results of research showed that, the optimum immertion time to 50 minutes, with the optimum membrane composition consist of Pyrophylite : PVC : activated carbon : DOP is 49 : 16 : 3 : 32 (% b/b). Characterization of Lead (II)-based coated wire type pyrophyllite produced include: linear concentration range of lead 10-5 - 10-1 M at a price of 29.33 Nernst Factor mV/decade of concentration. The resulting detection limit is 8.054 x 10-6 M or equal to 1,669 ppm of lead, the resulting response time of 30 seconds and a life time of 45 days. Keywords : coated wire type, Ion Selective Electrode (ISE), lead, pyrophyllite
PENENTUAN KAFEIN SECARA AMPEROMETRI DENYUT MENGGUNAKAN ELEKTRODA KARBON SCREEN-PRINTED Setyorini, Dian Ayu; Mulyasuryani, Ani; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 1 (2014)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

Caffeine is usually used as an additive in drinks, foods and medicines. Caffeine has a negative effect on the human body so ithas a limited dose to consume. Amperometric detection can be used to measure caffeine by using SPCE. Determination of caffeine by amperometry can use single-pulse (SPA) and double-pulse (DPA). SPA applied detection potential 1,3 V (0,05 s) and has limit of detection 22 µM. DPA applied detection potential 1,3 V (0,05 s) and cleaning potential 0,35 V (0,1 s) and has limit of detection 0,9 µM. DPA was used to measure caffeine in sample of energy drinks and it concludes good accuracy. Keywords: pulse amperometry, caffeine, SPCE.
UJI SELEKTIFITAS DAN VALIDITAS TEST KIT MERKURI(II) Putra, Bhurman Pratama; Sulistyarti, Hermin; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 2 (2014)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Merkuri adalah logam berat yang sering diketahui masyarakat tentang bahayanya jika terpapar oleh manusia. Untuk mengetahui kadar merkuri, biasanya digunakan instrumentasi yang mahal. Pada penelitian ini, telah dibuat metode alternatif berupa test kit untuk penentuan kadar merkuri berdasarkan pembentukan kompleks merkuri dengan ditizon yang berwarna oranye. Namun test kit yang telah dibuat tersebut belum dilakukan uji selektifitas dan validitasnya. Uji selektifitas dilakukan dengan melihat pengaruh ion Ag+ dan Pb2+ terhadap kinerja test kit dengan rentang konsentrasi 1-10 ppm. Penambahan ion Ag+ 10 ppm menurunkan absorbansi test kit merkuri 1-10 ppm sebesar 12,12 %, sedangkan penambahan ion Pb2+ dengan konsentrasi yang sama yakni 10 ppm, absorbansi test kit merkuri relatif konstan. Untuk memvalidasi test kit merkuri ini, dilakukan dengan cara menguji sampel sintetis merkuri dan membandingkannnya dengan metode standar AAS (spektrofotometer serapan atom). Hasil validasi menunjukkan bahwa test kit merkuri memberikan akurasi 90% sedangkan metode standar AAS memberikan nilai akurasi yang tinggi, yakni sebesar 98,83%.   Kata kunci: Merkuri, test kit, ditizon, selektifitas, validitas
OPTIMASI METODE SPEKTROFOTOMETRI UNTUK PENENTUAN TIOSIANAT BERDASARKAN PEMBENTUKAN SENYAWA HIDRINDANTIN MENGGUNAKAN OKSIDATOR HIPOKLORIT Kusumaningtyas, Nadia Mira; Sulistyarti, Hermin; Fardiyah, Qonitah
Jurnal Ilmu Kimia Universitas Brawijaya Vol 1, No 1 (2015)
Publisher : Jurusan Kimia, FMIPA Universitas Brawijaya

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Abstract

ABSTRAK Tiosianat adalah senyawa yang mempunyai sifat goitrogenik. Sifat ini akan menyebabkan gangguan akibat kekurangan iodium (GAKI). Penentuan tiosianat dapat dilakukan dengan mereaksikan ninhidrin 1% dan oksidator hipoklorit membentuk senyawa hidrindantin biru dalam suasana basa. Senyawa hidrindantin biru yang terbentuk dianalisa secara spektrofotometri pada panjang gelombang maksimum 590 nm. Variabel penelitian ini meliputi waktu pengukuran dari 10-40 menit, pH larutan 9-14, dan konsentrasi hipoklorit 0,02-0,2 M sebagai oksidator dalam reaksi oksidasi tiosianat menjadi sianida untuk pembentukan senyawa hidrindantin. Hasil penelitian menunjukkan waktu optimum  reaksi oksidasi tiosianat menjadi sianida untuk pembentukan senyawa hidrindantin adalah 10 menit dan stabil sampai menit ke-20. Reaksi oksidasi tiosianat menjadi sianida dan pembentukan senyawa hidrindantin secara optimum terjadi pada pH 12,5, konsentrasi optimum hipoklorit yang digunakan pada proses oksidasi tiosianat adalah 0,15 M. Kata kunci : GAKI, goitrogenik, hidrindantin, ninhidrin, tiosianat ABSTRACT Thiocyanate is a substance which has goitrogenic properties causing iodine deficiency disorders (IDD). Thiocyanate was oxidized with hypochlorite in alkaline condition in the presence of ninhydrin to form blue colored hydrindantin substance which is analyzed by spectrophotometry at wavelength of 590 nm. In this research the method was optimized towards oxidizing time from 10-40 minutes, pH of solution from 9-14, and hypochlorite concentration from 0.02-0.2 M. The results showed that the optimum time for thiocyanate oxidation was 10 minutes and was stable up to 20 minutes, optimum solution pH of 12.5, and optimum concentration of hypochlorite of 0.15 M.   Keywords: IDD, goitrogenic, hydrindantin, ninhydrin, thiocyanate
Determination of Lead in Cosmetic Sampels Using Coated Wire Lead (II) Ion Selective Electrode Based On Phyropillite Qonitah Fardiyah; Barlah Rumhayati; Ika Rosemiyani
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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Abstract

A coated wire ion selective electrode (CW-ISE) based on pyrophyllite for detection lead (II) in cosmetic samples was developed. CW-ISE has easy measurement for field analysis, good selectivity and sensitivity. The CW-ISE’s membrane consist of mixture an inorganic material of pyrophyllite as  ionophore, polyvinylchloride (PVC) as the matrix polymer, activated carbon and dioktilftalat (DOP) as a plasticizer dissolved in tetrahydrofuran (THF) solvent (1:3 w/v).  It showed a good Nernstian slope of 29.33 mV/decade concentration, a lead linear range concentration between 10-1- 10-5 M, and detection limit of 8.054 x10-6 M  (equal with 1.669 ppm of lead). And could be used optimally at pH 5 and showed a good selectivity for interfering ions (sodium ion, mercury ion and chromium ion) with selectivity order of lead >mercury>chromium>sodium.  The CW-ISE Lead (II) based on pyrophyllite could be applied for determination lead in cosmetic samples, with precision of 95.42% and accuracy of 96.49%. Based on the statistical t test with 5% confidence limit, the potentiometric method and Atomic Absorption Spectrophotometry method had no significant differences.
A Simple and Safe Spectrophotometric Method for Iodide Determination Sulistyarti, Hermin; Atikah,; Fardiyah, Qonitah; Febriyanti, Sita; Asdauna,
Makara Journal of Science Vol. 19, No. 2
Publisher : UI Scholars Hub

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Abstract

In order to practice green chemistry, a simple and safe spectrophotometric method for iodide determination has been successfully developed based on the formation of a blue starch-iodine complex. Iodide was oxidized to form iodine prior to the addition of a starch solution, and the blue starch-iodine complex was directly detected spectrophoto-metrically at a wavelength of 615 nm. The chemical parameters, such as type, reaction time, as well as concentration of oxidizing agents and solution pH were optimized with respect to sensitivity and analysis time. The method showed optimum results under iodate oxidant with a mol ratio of IO3-:I- =1:3, reaction time of 5 minutes, and solution pH of 5. Under these optimum conditions, the method showed linierity measurements from 5-40 mg/L iodide with a correlation (R2) of 0.9889. This technique offers a simple, safe, accurate, and relatively fast method for iodide determination, which is prospective for monitoring iodide samples.
Development of Voltammetry Analysis Method of Iron Metal Ions by Solid-State Membrane with Carbon Nanotube Suyanta, Suyanta; Sunarto, Sunarto; Padmaningrum, Regina Tutik; Karlinda, Karlinda; Isa, Illyas Md; Zainul, Rahadian; Fardiyah, Qonitah; Kurniawan, Fredy
Indonesian Journal of Chemistry Vol 24, No 3 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.81771

Abstract

This work developed a selectively modified electrode for measuring the Fe(II) ions in continuous integration using voltammetry techniques. The study assessed various aspects, such as linearity, scan rate, repeatability, and real sample analysis. The experiment is performed using differential pulse voltammetry (DPV). The findings of the study indicated that the voltammetry method exhibited a regression line of y = 36.507 ln(x) + 990.73, with a correlation value of 0.9627, with an optimum scan rate of 20 mV/s and good repeatability over five times measurement. On the other hand, when comparing the results using the UV-Vis spectrophotometric technique, the regression equation was found to be y = 0.20438x − 0.06987, with a correlation value of 0.99583. Notably, the voltammetry measurement outperformed the UV-Vis method since it allowed analysis of Fe(II) at concentrations up to 6.35 × 10−4 ppm (or 1.00 × 10−11 M), while the UV-vis measurement could only analyze up to 1.5 ppm (or 2.36 × 10−5 M). Consequently, the developed technique proves to be superior to the other methods for the analysis of Fe(II).
The Study of Removal of Polyvinyl Chloride (PVC) Particles from Wastewater through Electrocoagulation Ramadani, Azaria Ivana; Fardiyah, Qonitah; Rumhayati, Barlah
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.95589

Abstract

Plastic was produced massively, especially using polyvinyl chloride (PVC) as a raw material. Unfortunately, this condition cause affects the environment, which creates a new pollutant issue. It is essential to study the removal of PVC microplastics in current water treatment processes. The study of wastewater treatment can be achieved using electrocoagulation, which has several benefits, including low-cost, simple chemicals, and accessible equipment operation. This research investigated the study of the removal of PVC microplastics from wastewater by electrocoagulation. The new potential of the electrocoagulation technique using Al-Al electrodes was studied systematically at various variations, i.e., electrolysis time, electrolyte concentration, initial pH, coagulation speed, and electrolyte type. The results showed that the PVC microplastics removal efficiency reached 100% after electrolysis for 60 min, electrolyte concentration of 0.01 mol/L, initial pH of 7, coagulation speed of 500 rpm, the type of electrolyte used was NaCl at a flocculation speed. These optimum conditions also reduced the value of turbidity of wastewater samples from 1.39 ± 0.02 to 1.10 ± 0.05 NTU. The results of this study provide an engineering perspective in optimizing operational parameters for removing PVC microplastics in aquatic environments.
Bioadsorption of Copper(II) Using Halmahera Specific Marine Algae (Sargassum turbinarioides) Encapsulated Calcium Alginate Sanawi, Dede Ardiansyah Takdir Abubakar; Rumhayati, Barlah; Fardiyah, Qonitah
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99090

Abstract

This study investigated the conditions for bioadsorption of copper(II) using Halmahera marine algae (Sargassum turbinarioides) encapsulated with calcium alginate by batch method. Physicochemical parameters of biosorption, including contact time, biosorbent mass, pH, and copper(II) concentration, were studied to determine the percentage of copper(II) adsorbed. The maximum percentage of copper(II) bioadsorption was 96.4% under the optimum bioadsorption conditions with a contact time of 90 min, a biosorbent mass of 2 g, a solution pH of 5, and a copper(II) concentration of 60 mg/L. The bioadsorption isotherm study showed that the Langmuir model is more suitable for modeling copper(II) bioadsorption, while the bioadsorption kinetics study showed a pseudo-second-order kinetic model. Characterization of the biosorbent using FTIR showed that the biosorbent has active functional groups such as O–H, C–H, S–H, C=O, S=O, and C–O–C, which act as metal ligands, and SEM characterization showed morphological changes in the biosorbent before and after the copper(II) bioadsorption process.
Co-Authors Akhmad Sabarudin An-Nufuus, Digwanggi Arum Tazkiyatu Anggraini, Vita Dwi Ani Mulyasuryani Arie Srihardyastutie Arini Sugiarti Arumdati, Rara Aulia Asdauna Asdauna Asdauna, Asih Hajaranti Astuti, Luluk Indri Atikah . Atikah Atikah Atikah, Atikah, Atikah Atikah, atikah Barlah Rumhayati Barlah Rumhayati Daninda, Mahani Diah Mardiana Djatmika, Rosalina Fahmi, Ahmad Luthfi Fahrana Salas Trenggamayu Nelgi Faiza, Nur Febriyanti, Sita Fiddaroini, Saidun Fredy Kurniawan Gunawan, David Hermin Sulistyarti Hermin Sulistyarti Hermin Sulistyati Hidayaty, Alfianita Nuril Hulwati, Siti Ika Rosemiyani Ika Rosemiyani Ilham Krisdarmawan Putra Isa, Illyas Md Karlinda Karlinda Kusumaningtyas, Nadia Mira Layta Dinira Linda Noviana Maulidah, Fajar Rizqy Maulidyawati, Titin Mochammad Imron Awalludin Nugraha, Hedhi Setya Puspitaningrum, Shanti Putra, Bhurman Pratama Rahadian Zainul Rahmawati, Alif Faiza Ramadani, Azaria Ivana Regina Tutik Padmaningrum Rivaatun Dwi N Dwi N. Roisatul Hasanah Sabarudin, Akhmad Sanawi, Dede Ardiansyah Takdir Abubakar Setyorini, Dian Ayu Silzha Eka Prasetya Irawan Sita Febriyanti Sunarto Sunarto Suyanta Suyanta Syafira Ayu Deviana Syarifah, Nidatul Thahir, Firda Syawalina Ulfa Andayani, Ulfa Wijanarko, Aris Wijaya, Khalida Yofandi, Muhammad Farrel Yuniar Ponco Prananto