Garuda - Garba Rujukan Digital

p-Index From 2021 - 2026

1.431

P-Index

This Author published in this journals

All Journal VALENSI CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry) Jurnal Kimia (Journal of Chemistry) Ecotrophic, Journal of Environmental Science JURNAL KIMIA SAINS DAN APLIKASI The Journal of Pure and Applied Chemistry Research Jurnal Riset Kimia Jurnal Kimia Riset ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Ilmu Pendidikan Indonesia Aceh International Journal of Science and Technology Seminar Ilmiah Nasional Teknologi, Sains, dan Sosial Humaniora (SINTESA)

Irdhawati Irdhawati

Department Of Chemistry, Faculty Of Mathematic And Natural Sciences, Udayana University, Bali 80361 Indonesia

Author-ID : 485902

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences

Published : 24 Documents Claim Missing Document

Claim Missing Document

Articles

Title

Sintesis dan Karakterisasi Grafena dengan Metode Reduksi Grafit Oksida Menggunakan Pereduksi Zn Yudha Taufantri; Irdhawati Irdhawati; Ida Ayu Raka Astiti Asih
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

Graphene is a thin material, has a hexagonal two-dimentional lattice and is considered as an interesting material for adsorption process. Nowadays, graphene has been known as a potential material for diverse application, such as adsorbent. In this study graphene was synthesized from graphite. Furthermore, graphene was applied for adsorption of dichloro diphenyl trichloroethane (DDT). Graphene was synthesized by Hummer’s method using hydrothermal and reduced by Zn. The samples were characterized by Scanning Electron Microscope (SEM) and X-Ray Diffraction (XRD) methods. The results of the XRD showed graphene structure in the 2θ, appeared at 23.9369 with interlayer spacing was about 3.71763 Å, compared with graphite oxide structure in the 2θ appeared at 11.2055 with interlayer spacing was about 7.89649 Å. The results of SEM analysis showed graphene has one layer with planar hexagonal structure and seems transparent whose single layer and multi layers. The graphene adsorption was analyzed by using the UV-Visible spectrophotometer. The results indicated the surface area of graphene was shown as 46.8563 m2/g. The amount of DDT adsorbed by graphene during 15 minutes was 7.5859 mg/g. This adsorption mechanism of DDT and graphene might be due to π-π and hydrogen interactions. Keywords: Adsorption, dichloro diphenyl trichloroethane (DDT), graphena. DOI: http://dx.doi.org/10.15408/jkv.v2i1.2233

Analisis Logam Fe dengan Teknik Voltammetri Pelucutan Anodik Pulsa Diferensial dalam Tanaman Pakcoy dari Perkebunan Sayur Bedugul Bali Irdhawati Irdhawati; Rosanti Suryani Tince Mbatu; Emmy Sahara
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 4, No. 2, November 2018
Publisher : Syarif Hidayatullah State Islamic University

Pakcoy is one of the most popular vegetable. The use of synthetic fertilizers and pesticides contain heavy metals can contaminate pakcoy vegetable. This research aims to determine the validity of measurements and concentration of Fe in pakcoy using differential pulse anodic stripping voltammetry technique.The working, reference, and counter electrodes were platinum disk, Ag/AgCl, and Pt wire, respectively. The optimum measurement results of the standard solutions of Fe(III) obtained the optimum deposition time was 70 seconds, the optimum scan rate was 10 mV/s, and the optimum deposition potential at -0.47 V. A linear concentration of standard solution of Fe(III) observed at the range of 50 ppb~500 ppb, with correlation coefficient 0.9954. Limit of detection was 50.18 ppb. The repetition of 10 times measurements had a Horwitz ratio of less than 2. Percent recovery was 100.26% ± 0.27%. The average of Fe(III) concentration in the samples from 5 (five) locations of the pakcoy sampling contains 3.82±0.29 ppm, less than SNI treshold line of 5.0 ppm.

Differential Pulse Voltammetry Technique Using Ferrocene-Modified Carbon Paste Electrodes for Determination of Pb(II) In Kepok Banana Irdhawati Irdhawati; Feby Silvia; Emmy Sahara; Nur Alisyah Gani
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 2, November 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i2.16610

The voltammetry method is a field of electrochemistry that measures electric current at a certain potential, which can be used to determine the concentration of inorganic and organic compounds that can be oxidized or reduced. In this research, the differential pulse voltammetry (DPV) technique has been used to determine the content of Pb(II). The carbon paste electrode (CPE) and ferrocene-modified carbon paste electrode (CPE-Fc) were used as working electrodes. This study aims to improve the sensitivity of Pb(II) measurement. Two parameters were optimized were ferrocene composition and scan rate. The validation parameters involved the linear concentration range, detection limit, quantization limit, precision and accuracy. The optimum ferrocene composition was found at 6%, and scan rate was 15 mV/s using CPE, increase to 20 mV/s using CPE-Fc. The validation results showed the linearity using CPE-Fc wider than CPE at the peak potential of 0.515 V. The detection and quantization limit values using CPE were 0.1551 µg/L and 0.1556 µg/L, and down to 0.1089 µg/L and 0.1090 µg/L using CPE-Fc. The precision determination for both of CPE and CPE-Fc had good results, indicated by the Horwitz ratio less than two. Percentage of recovery using CPE-Fc of 85.59 8.18%. CPE-Fc at the optimum measurement conditions was used to determine the levels of Pb(II) in kepok banana, and the result was obtained 4.4306 0.0009 mg/kg. The level of Pb content was found to exceed the established threshold based on Standard National Indonesia (ISN) No. 7387:2009 which is 0.5 mg/kg.

Co-Authors Alling Andini Anak Agung Bawa Putra Anisha Maulinasari Arisma Damayanti Ayu Jyostosya Yotirani Arya Wijana Carver J M Ekki Inur Ingtyas Mawarni Emmy Sahara Feby Silvia Feby Silvia Sitio Gede Widihati, Ida Ayu Henu Sumekar Hery Suyanto Hery Suyanto I Gusti Ayu Putu Yunita Riyastini I W BUDIARSA SUYASA I Wayan Hermawan I. A. R. Astiti Asih Ida Ayu Gede Widihati Iryanti Eka Suprihatin James Sibarani Liana Sari Made Arsa Manuntun Manurung Manuntun Manurung Nadya Sarilla Agatha Ni G. A. M. Dwi Adhi Suastuti Ni Kadak Nevi Titasia Ni Ketut Esati Ni Ketut Shinta Mas Methaninditya Ni Ketut Yuni Sri Lestari Ni Made Puspawati Ni Putu Antari Dewi Ni Putu Gita Widi Saraswati Nur Alisyah Gani Nyoman Sudarma Putu Yani Andani Rosanti Suryani Tince Mbatu Suarya P Titasia, Ni Kadak Nevi Triyunita Sinthadevi, Ni Nyoman Vivi Eka Indrayani Wirajana, Nengah WIWIK SUSANAH RITA Yudha Taufantri

Title Search

Found 3 Documents Search Journal : VALENSI

Abstract

Abstract

Abstract

Title

Found 3 Documents
Search
Journal : VALENSI