Article Per Year (5 Year)
p-Index From 2019 - 2024
0
P-Index
This Author published in this journals
All Journal CHEMISTRY PROGRESS Jurnal Sains Dasar Jurnal Ilmu Kimia Universitas Brawijaya UNEJ e-Proceeding Makara Journal of Science
Qonitah Fardiyah
Department Of Chemistry, Faculty Of Mathematic And Natural Science, Brawijaya University, Malang
Chemical Engineering, Chemistry & Bioengineering Chemistry Education

Published : 27 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 27 Documents
Search

 1   2   3 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (252.735 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (97.194 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (438.369 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.195 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.692 KB)

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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Co-Authors Ani Mulyasuryani Arini Sugiarti Arumdati, Rara Aulia Asdauna Asdauna Asdauna, Asih Hajaranti Atikah . Atikah Atikah Atikah Atikah Atikah, Atikah, Atikah Atikah, atikah Barlah Rumhayati Barlah Rumhayati Daninda, Mahani Djatmika, Rosalina Fahrana Salas Trenggamayu Nelgi Faiza, Nur Febriyanti, Sita Gunawan, David Hermin Sulistyarti Hermin Sulistyarti Hermin Sulistyati Ika Rosemiyani Ika Rosemiyani Ilham Krisdarmawan Putra Kusumaningtyas, Nadia Mira Linda Noviana Maulidah, Fajar Rizqy Maulidyawati, Titin Puspitaningrum, Shanti Putra, Bhurman Pratama Rahmawati, Alif Faiza Rivaatun Dwi N Dwi N. Roisatul Hasanah Sabarudin, Akhmad Setyorini, Dian Ayu Silzha Eka Prasetya Irawan Sita Febriyanti Syafira Ayu Deviana Thahir, Firda Syawalina Wijanarko, Aris