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All Journal Jurnal SOLMA JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Riset Pendidikan Kimia (JRPK) Jurnal Riset Sains dan Kimia Terapan Chemistry and Materials
Yussi Pratiwi
Universitas Sebelas Maret
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Other

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Synthesis Dithizone-Immobilized In Polivinyl Chloride Membranes For Copper Detection in Water Pratiwi, Yussi; Febrian, Yogi; Klaudia, Angelina
Chemistry and Materials Vol. 3 No. 2 (2024)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v3i2.80

Abstract

A simple, cost-effective, and environmentally friendly analytical method is needed to determine Cu (II) levels in water. Many methods have been developed by immobilizing dithizone in a polyvinyl chloride (PVC) matrix with dioctyl phthalate (DOP) as a plasticizer in a tetrahydrofuran (THF) solvent. However, the optimal composition of PVC, DOP, and THF has not been determined. The purposes of this study were to determine the optimal composition of dithizone, PVC, and DOP for the sensor membranes, evaluate the performance of the chemical sensors in detecting Cu (II) ions, and measure the copper content in conventional drinking water. The research began with the fabrication of sensor membranes, followed by absorbance testing, and concluded with method validation through characterization. Adsorption of Cu (II) caused the membrane colour to change from yellow to reddish orange, with maximum absorbance observed at 427 nm. The sensor membrane exhibited the best response to Cu (II) ions at pH 2.8. A linear calibration curve for Cu (II) was obtained in the concentration range of 0-0.6 ppm, with an R² value of 0.9924. The limit of detection was 1.9881 x 10⁻³ mg L⁻¹, and the limit of quantification was 6.0245 x 10⁻³ mg L⁻¹. The molar absorptivity was 9.4831 x 10⁴ L mol⁻¹ cm⁻¹. The proposed sensor membrane was used to measure Cu (II) in drinking water employing the internal standard addition method, with observed recoveries ranging from 98.63% to 100.29%. The copper levels in the drinking water samples tested in this study did not exceed the drinking water quality standards set by PERMENKES RI number 492/PER/IV/2010.
Validasi Metode Analisis Fosfor pada Sampel Daging dengan Pereduksi Hidrazin Sulfat menggunakan Spektrofotometri Uv-Vis Khanza, Adelia Nisrina; Pratiwi, Yussi
Jurnal Riset Sains dan Kimia Terapan Vol. 10 No. 1 (2024): Jurnal Riset Sains dan Kimia Terapan, Volume 10 Nomor 1, Juni 2024
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.101.03

Abstract

Abstrak Pakan ternak yang biasanya dikonsumsi untuk menjaga nutrisi ternak mengandung fosfor. Fosfor dalam pakan ternak dapat menyebabkan akumulasi fosfor dalam daging ternak. Oleh karena itu, analisis fosfor secara berkala diperlukan untuk memastikan makanan tersebut aman untuk dikonsumsi. Analisis fosfor diukur dengan menggunakan metode spektrofotometri UV-Vis dengan menentukan kondisi optimum untuk analisis fosfor kemudian dilanjutkan validasi metode analisis yang terdiri dari parameter linearitas, sensitivitas, batas deteksi dan kuantitasi, akurasi dan presisi. Reaksi molibdenum biru menghasilkan senyawa kompleks fosfomolibdat dengan panjang gelombang 689 nm. Validasi metode analisis fosfat tereduksi hidrazin sulfat memiliki linearitas dengan nilai R2 = 0,9984 pada rentang 0 - 0,05 mg L-1 . Absorptivitas molar sebesar 7,9259 x 104 L mol-1 cm-1 . Nilai limit deteksi (LOD) sebesar 5,26 x 10-4 mg L-1 dan nilai limit kuantitasi (LOQ) sebesar 1,59 x 10-3 mg L-1 . Nilai presisi dinyatakan dalam persen simpangan baku relatif %RSD pada daging bebek, ayam dan sapi sebesar 1,33%, 1,34% dan 1,08%. Persen perolehan kembali yang diperoleh untuk setiap sampel daging berkisar antara 90% - 117%. Fosfat yang terkandung dalam daging bebek, ayam dan sapi tidak melebihi baku mutu menurut Persatuan Ahli Gizi Indonesia (PERSAGI). Kata kunci: hidrazin sulfat, metode analisis fosfor, spektrofotomateri UV-Vis Abstract Animal feed which is usually consumed to maintain the nutrition of livestock contains phosphor. The phosphor in animal feed may cause an accumulated phosphor in meat. Therefore, a regular phosphor analysis is needed to make sure the food is safe. Phosphor analysis is measured by using spectrophotometry UV-Vis method by determining the optimum conditions for phosphorus analysis and then continued analysis validation which consists of linearity parameter, sensitivity, limit of detection and quantitation, accuracy, and precision. The reaction of blue molybdenum results in complex phosphomolybdate compound with a wavelength of 689 nm. The method validation of analysis of phosphate reduced hydrazine sulfate have a linearity of the method with R2=0.9984 in the range of 0 - 0.05 mg L-1 . The molar absorptivity of 7.9259 x 104 L mol-1 cm-1 . The value of limit of detection (LOD) of 5.26 x 10-4 mg L-1 and quantitation limit (LOQ) value of 1.59 x 10-3 mg L-1 . The precision values were expressed as percent of the relative standard deviations of %RSD in duck, chicken and cow of 1.33%, 1.34% and 1.08%. The percent recovery is obtained for each sample of meat ranged from 90% - 117%. Phosphate contained in duck, chicken and cow did not exceed the quality standard according to the Indonesian Nutritionist Association (PERSAGI). Keywords: analysis fosfor method, hidrazin sulfat, spektrofotomateri UV-Vis
Biosynthesis of Poly Acrylic Acid (PAA) Modified Silver Nanoparticles, Using Basil Leaf Extract (Ocimum basilicum L.) for Heavy Metal Detection Pratiwi, Yussi; Yusmaniar, Yusmaniar; Nurhasanah, Nurhasanah
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 3 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i3.78641

Abstract

This study focused on characterizing synthesized silver nanoparticles (AgNPs) and evaluating their efficacy as colorimetric detectors for heavy metal ions. The synthesis employed a bottom-up approach, using AgNO3 as a precursor, reduced by secondary metabolites in basil leaf extract, enhanced with Polyacrylic acid (PAA). Basil leaves were chosen for their rich content of secondary metabolites like phytosterols, alkaloids, phenolic compounds, tannins, lignin, starch, saponins, flavonoids, terpenoids, and anthraquinones, crucial in reducing silver ions. Incorporating basil leaf extract as a bioreactor and adding PAA to increase stability and selectivity towards metal ions are innovative aspects of this research. The optimal AgNP composition was attained with a 0.7 mL basil leaf extract to 10 mL AgNO3 ratio plus 2% PAA. The AgNP formation was indicated by a color change from yellow to brownish, with a Surface Plasmon Resonance (SPR) peak at 418 nm. Characterization via Fourier Transform Infrared Spectroscopy (FTIR) revealed hydroxyl (-OH) and carbonyl (C=O) functional groups aiding in silver ion reduction. Particle Size Analysis (PSA) showed AgNPs of 72.3 nm size, with a polydispersity index of 0.504. Colorimetric detection tests were conducted on Cu(II), Pb(II), Cd(II), Zn(II), and Mn(II) ions. AgNPs exhibited high reactivity towards Cu2+, changing color from brownish to clear white within a minute upon Cu2+ addition, unlike Cd2+, Mn2+, Zn2+, and Pb2+, which showed negligible changes. This indicates a heightened sensitivity of AgNPs to Cu2+ ions. Such a colorimetric sensor could be instrumental in detecting heavy metals in drinking water, showcasing the potential application of AgNPs in environmental monitoring.
Phosphorus Analysis in Meat using UV-Vis Spectrophotometry with SnCl2 and Hydrazine Sulfate Reduction Pratiwi, Yussi; Amelia, Rizky; Natasya, Aulia
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 3 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i3.78607

Abstract

This study aimed to optimize phosphorus analysis in meat using a molybdenum blue reaction involving SnCl2 and hydrazine sulfate as reducing agents to establish the most effective conditions for phosphorus detection. Meat, an essential source of nutrients like phosphorus, plays a vital role in human health, particularly bone and tooth strength. However, overconsumption of phosphorus can lead to health issues such as hyperphosphatemia, making regular monitoring of phosphorus levels in food necessary. The experiment used SnCl2 and hydrazine sulfate under varying acidic conditions to produce a stable blue complex indicative of phosphorus presence. The complex exhibited maximum absorbance in the 689–729 nm wavelength range. Validation of the method showed high linearity with R2 values of 0.9983 and 0.9984 for SnCl2 and hydrazine sulfate, respectively. The molar absorptivity for SnCl2 was 2.093 x 105 L mol-1 cm-1 and 7.92 x 104 L mol-1 cm-1 for hydrazine sulfate. Detection and quantification limits were established, and the %RSD values in each sample ranged from 1.08% to 1.93%, conforming to standard requirements. Upon analysis of meat samples, including duck, chicken, and beef, the phosphorus levels did not meet the Indonesian Nutritionist Association (PERSAGI) standards. This result emphasizes the need for regular phosphorus analysis in meat products to prevent health risks associated with excessive phosphorus intake, such as hyperphosphatemia.
Pelatihan Pembuatan Tester kit Menggunakan Bahan Alam untuk Deteksi Awal Boraks dan Formalin Di Lingkungan MGMP Kimia Jakarta Selatan 2 Pratiwi, Yussi; Aulia, Miftah; Triananda, Inez; Triputra R., Rivqi
Jurnal SOLMA Vol. 13 No. 3 (2024)
Publisher : Universitas Muhammadiyah Prof. DR. Hamka (UHAMKA Press)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/solma.v13i3.16188

Abstract

Background: Saat ini banyak sekali makanan yang mengandung bahan tambahan pangan berbahaya seperti boraks dan formalin untuk mengawetkan makanan agar tahan lama dan memberikan tekstur kenyal. Penggunaan boraks dan formalin pada makanan memberikan dampak berbahaya bagi kesehatan karena bersifat karsinogenik. Salah satu cara untuk menghindari pengkonsumsian makanan yang mengandung boraks dan formalin yaitu dengan membuat tester kit dengan memanfaatkan bahan alam seperti kunyit dan kulit ubi ungu dilihat dari perubahan warnanya. Tujuan dari kegiatan ini adalah memanfaatkan ekstrak kurkumin pada kunyit dan ekstrak antosianin pada kulit ubi ungu untuk dijadikan tester kit sehingga dapat mengedukasi dan meningkatkan kewaspadaan di lingkungan MGMP Jakarta Selatan 2. Metode: Metode yang digunakan adalah penyuluhan dan demonstrasi di SMA Negeri 82 Jakarta pada bulan Agustus 2024. Hasil: Hasil dari kegiatan ini adalah dapat meningkatkan kewaspadaan mengenai keamanan pangan dan meningkatkan ketertarikan dan keterampilan para guru kimia di lingkungan MGMP Jakarta Selatan 2 terhadap pembuatan tester kit dari bahan alam. Kesimpulan: Kesimpulan dari kegiatan ini adalah bahan alam seperti kunyit dan kulit ubi ungu dapat dimanfaatkan sebagai tester kit untuk mendeteksi awal kandungan boraks dan formalin sehingga kekhawatiran masyarakat terhadap keamanan pangan dapat berkurang dengan penggunaan tester kit dan mendorong kreativitas serta keterampilan masyarakat untuk membuat tester kit dan keinginan untuk menerapkan materi penyuluhan pada pembelajaran di sekolah.
Analisis Model Mental Peserta Didik pada Pembelajaran Sistem Periodik Unsur Menggunakan Represnetasi 3D Noviyanti, Rezti Wahyu; Rahmawati, Yuli; Pratiwi, Yussi
JRPK - Jurnal Riset Pendidikan Kimia Vol. 15 No. 1 (2025): Jurnal Riset Pendidikan Kimia (JRPK), Volume 15 Nomor 1 (2025)
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRPK.151.01

Abstract

This study aims to analyze the mental model of students in learning the periodic system of elements using 3D representations. This research was conducted in the odd semester of the 2022/2023 academic year. The research subjects were 36 students of class XB SMAN 54 Jakarta. This study used qualitative research methods. Data collection techniques through mental model tests, interviews, reflective journals, and classroom observations. The students' mental models were analyzed in three stages, namely engage, explore, and explain. The students' mental models are categorized into three, namely scientific, synthetic, and initial mental models which are viewed from the three levels of macroscopic, submicroscopic, and symbolic representations. The results showed that class XB had three categories of mental models, namely scientific mental models with an overall average of 70.86%, synthetic mental models with an overall average of 17.54%, and initial mental models with an overall average of 11.60 %. Mental models are formed from the thoughts and experiences of students who previously had, teacher explanations, 3D representation media, and handbooks or other sources.
Co-Authors Aulia, Miftah Febrian, Yogi Fitri, Novita Cahyani Khanza, Adelia Nisrina Klaudia, Angelina Natasya, Aulia Noviyanti, Rezti Wahyu Nurhasanah Nurhasanah Rizky Amelia Triananda, Inez Triputra R., Rivqi Yuli Rahmawati Yusmaniar Yusmaniar