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All Journal Eksakta : Berkala Ilmiah Bidang MIPA Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education
Abdon Saiya
Universitas Negeri Manado
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering

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ANALISIS RESIDU KLORPIRIFOS DALAM SAYURAN KUBIS DENGAN METODE HPLC DI BEBERAPA PASAR TRADISIONAL DI SULAWESI UTARA Abdon Saiya
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 18 No. 02 (2017): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.221 KB) | DOI: 10.24036/eksakta/vol18-iss02/57

Abstract

One type of pesticide that is widely used is a group of organophosphates with chlorpyrifos as the active ingredients, because it has more favorable characteristics such as easy to decompose and short persistence time. However, the use of pesticides in addition to leaving residues that can cause environmental pollution, also cause disruption to human health and inhibit trade. Therefore, it is necessary to monitor the use of pesticides through the fulfillment of the maximum residual limit (MRL) so as to ensure food safety by limiting pesticide residue levels on agricultural products. The purpose of this study was to determine the residual levels of chlorpyrifos in cabbage vegetables with previously optimized and validated HPLC methods. The sample of this research is vegetable cabbage taken from several traditional markets in North Sulawesi. Based on the results of the study, it was found that chlorpyrifos were detected in all samples analyzed, although the levels were still below the specified MRL value. The results of this study can be a consideration for consumers and relevant agencies in North Sulawesi to more frequently monitor and evaluate the existence and use of these compounds.
Optimasi dan validasi metode analisis residu klorpirifos menggunakan High Performance Liquid Chromatography (HPLC) Abdon Saiya; Dokri Gumolung; Dian Herlinda Octorina Howan
Jurnal Kimia Fullerene Vol 2 No 2 (2017): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (660.414 KB) | DOI: 10.37033/fjc.v2i2.20

Abstract

One of the most sensitive and selective instrumentation techniques for the analysis of pesticide residues in vegetables at a high level is High Performance Liquid Chromatography (HPLC). To obtain optimum result of measurement, optimization and validation of measurement method is needed. The purpose of this research is to optimize and validate the determination of chlorpyrifos concentration by HPLC method, so it can be used for analysis of chlorpyrifos residues in samples of cabbage vegetables taken from some traditional markets in North Sulawesi. Optimized chromatographic parameters are the composition of mobile phase of water and acetonitrile, mobile phase flow rate, and the volume of the sample injection. While the validated measurement parameters include precision, linearity, detection limits, and quantitation limits. Based on the results obtained using Zorbax Eclipse Plus C18 column, the optimum condition of HPLC was achieved at λmax of 289 nm, mobile phase composition of water : acetonitrile was 10:90, mobile phase flow rate of 0.70 mL/min, and sample injection volume of 15 μL. The result of validation of analytical method shows that analytic performance of determination of chlorpyrifos with HPLC method is very good, it is indicated by measurement parameter such as precision shown with coefficient of variation (CV) was 0,2086%, linearity indicated by correlation coefficient (r) was 0.9963, the detection limit (LOD) of 0.67 ppm, and the quantitative limit (LOQ) of 2.24 ppm, which all meet the requirements. The results of this study indicate that this method can be used for analysis of chlorpyrifos residues in cabbage vegetable samples.
Analisis Residu Pestisida dalam Tomat, Cabai Rawit dan Wortel dari Beberapa Pasar Tradisional di Sulawesi Utara Abdon Saiya; Dokri Gumolung; Joice Dorsila Susana Caroles
Jurnal Kimia Fullerene Vol 3 No 2 (2018): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (466.576 KB) | DOI: 10.37033/fjc.v3i2.40

Abstract

One method to eradicate plant pests carried out by farmers in the North Sulawesi area is to use pesticides because they are considered easy to obtain, the price is still affordable, and very effective at killing plant pests. However, improper use of pesticides results in the loss of pesticide residues in plants which causes environmental pollution, health problems in humans and inhibits trade. Therefore, it is necessary to monitor the use of pesticides through the fulfillment of the maximum residual limit (BMR). This study aims to analyze pesticide residues in tomatoes, cayenne pepper, and carrots using the method of High Performance Liquid Chromatography (HPLC) which was previously optimized and validated. The research samples were tomatoes, cayenne pepper, and carrots, taken from Pasar Bersehati Tomohon, Pasar Karombasan Manado, and Pasar Kawangkoan Minahasa, then taken to the Chemistry Laboratory of Manado State University to be extracted and analyzed. The results of this study indicate that pesticides with chlorpyrifos active ingredients were detected in almost all samples analyzed, although the levels were still below the specified BMR value, ie 1 mg/kg sample. The highest chlorpyrifos level was found in tomato samples taken from Pasar Kawangkoan Minahasa, which was 0.3150 mg/kg. The results of this study also showed that samples that were washed before extraction caused a decrease in the residual content of the petisides.
Penerapan Model Pembelajaran Peer-Led Team Learning Untuk Meningkatkan Hasil Belajar Siswa Pada Materi Larutan Elektrolit Dan Nonelektrolit Avni Dalemeng; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 3 No 2 (2021): Oxygenius: Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v3i2.305

Abstract

This study aims to improve student chemistry learning outcomes by applying the peer-led team learning model. This research design uses Classroom Action Research (CAR) which is divided into two cycles. With four stages, namely planning, action, observation and reflection. This research was carried out at SMA Negeri 1 Tagulandang in class X Science 1, totaling 31 students. This research is only focused on the material of electrolyte and nonelectrolyte solutions. In this study using instruments such as observation sheets, test questions and questionnaires. From the research that has been carried out, it is found that 77.41% of students have successfully met the Minimum Completeness Criteria (KKM) which was continued in the second cycle and obtained an average score of 77.58. From the results of student questionnaires and the results of observations given to students through peer-led team learning, students responded well. This shows that the peer-led team learning model has a positive impact on the learning process.
Pembelajaran Dalam Jaringan (Daring) Terhadap Hasil Belajar Siswa Pada Materi Larutan Elektrolit Dan Non Elektrolit Selama Masa Pandemi COVID-19 Lauren Cornelia Agatha; Dokri Gumolung; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 3 No 1 (2021): Oxygenius: Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v3i1.275

Abstract

The purpose of this study was to determine the magnitude of the effect of online learning on student learning outcomes in during the COVID-19 pandemic. This research was conducted in class X IPA SMA N 1 Tondano in the 2020/2021 academic year. A total of 25 students of class X IPA 1 were assigned as research samples. This study uses an experimental method with a One-Shot Case Study design. The results of this study consist of two data, namely questionnaire data for assessing student attitudes and post-test as an assessment of student learning outcomes which are then analyzed using correlation regression, and the regression equation obtained was Y = 9.5565 + 0.9073 x. The regression equation shows that the higher the student's attitude score (variable X), the higher the student's (variable Y). From the Product moment correlation test, it is found that the correlation coefficient (rxy) is 0.6599, which proves that the X and Y variables have a strong relationship. To calculate the effect of student attitudes on online learning on learning outcomes, it is calculated through the determinant coefficient formula, and it is found that the magnitude of the influence of student attitudes on online learning on learning outcomes is 43.55%. While the remaining 56.45% is influenced by other variables in the form of distractions and obstacles during online learning.
Pengembangan Paket Pembelajaran Kimia Berbantuan Powerpoint Pada Materi Struktur Atom Rini Yasinta Sasuang; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 4 No 1 (2022): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v4i1.361

Abstract

This study uses the Research and Development (R&D) method. The purpose of this research is to develop and determine the quality of powerpoint-assisted learning media. The research subjects were students of class X MIA 3 at SMA Catholic Don Bosco Bitung. The validation test of the four learning media assessment teams obtained 78.5% results, the material assessment team's validation test obtained 79.8% results. The overall results from the validation of the media assessment team and the material assessment team obtained an average result of 79.2% in the valid assessment category. The results of the teacher's response obtained a total score of 44 with an average of 88% included in the very interested category. The results of the first trial of 5 students obtained an average percentage of 36% of students who answered Strongly Agree, 52% of students who answered Agree, 10% of students who answered Disagree, 2% of students who answered Disagree, and 0% Strongly Do not agree. The results of the second trial of 10 students after repairs were made, the average percentage obtained was 67% of students who answered Strongly Agree, 33% of students who answered Agree. Based on the results of the responses of the two groups, it can be concluded that there was an increase in the large group
Studi kelayakan LKS praktikum berbasis pendekatan saintifik serta dampaknya pada hasil belajar materi sifat larutan penyangga Deysi Natalia Demo; Freetje Waworuntu; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 1 No 2 (2019): Oxygenius : Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.962 KB) | DOI: 10.37033/ojce.v1i2.113

Abstract

Penelitian ini bertujuan untuk mengetahui kelayakan produk LKS praktikum berbasis pendekatan saintifik dan mengetahui dampaknya pada hasil belajar khususnya materi sifat larutan penyangga dengan melihat seberapa banyak siswa yang mencapai atau melampaui KKM. Jenis penelitian ini adalah penelitian dan pengembangan yang dilakukan di kelas XI IPA 5 SMAN 1 Tondano. Berdasarkan hasil rekapitulasi, LKS praktikum berbasis pendekatan saintifik dinyatakan valid dengan nilai sebesar 83,8%. Dilihat dari respon siswa pada uji coba kelompok kecil dan kelompok besar LKS dinyatakan praktis dengan nilai berturut-turut sebesar 88,17% dan 92,98%. Dampak penggunaan LKS terhadap hasil belajar siswa adalah sebagian besar siswa pada uji coba kelompok kecil dan siswa pada uji coba kelompok besar telah melampaui KKM yang sudah ditetapkan dengan nilai ketuntasan yang diperoleh berturut-turut sebesar 66,67% dan 89,47%. Pengujian hipotesis untuk hasil belajar menggunakan uji t pihak kiri diperoleh nilai thitung(8,517) > ttabel(1,734) yang berarti terima H0 atau tolak H1. Berdasarkan hasil yang diperoleh dapat disimpulkan bahwa LKS praktikum berbasis pendekatan saintifik yang dikembangkan layak digunakan dalam proses pembelajaran.
Pengaruh Penerapan Model Kooperatif Tipe Teams Assisted Individualization (TAI) Disertai Praktikum Terhadap Hasil Belajar Siswa Pada Materi Ikatan Kimia Jeivana Laluas; Djefry Tani; Abdon Saiya
Oxygenius Journal Of Chemistry Education Vol 3 No 1 (2021): Oxygenius: Journal of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v3i1.240

Abstract

This study aims to determine the effect of the implementation of the Teams Assisted Individualization (TAI) cooperative model with practicum on learning outcomes. This study used an experimental method, with a posttest only control design. The population was students of class X IPA and the sample of class X IPA 2, amounting to 26 people as the experimental class and class X IPA 1, totaling 26 people as the control class. The results of the research were analyzed by using the hypothesis (t-test) and the tcount was 1.778> t table 1.67. From these data, it can be influence the application of the cooperative model type TAI along with practicum on student learning outcomes in chemical bonding material.
VALIDASI METODE ANALISIS BETA KAROTEN MENGGUNAKAN KCKT DAN APLIKASINYA PADA PENATAPAN KADAR BETA KAROTEN DALAM BUAH LABU KUNING Abdon Saiya; Joice Caroles
Jurnal Kimia Fullerene Vol 7 No 1 (2022): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v7i1.380

Abstract

Salah satu teknik instrumentasi yang akurat, sensitif dan selektif untuk penentuan kadar β-karoten adalah spektofotometri UV-Vis. Untuk memperoleh hasil pengukuran yang valid dan dapat dipercaya, maka harus dilakukan validasi metode pengukuran tersebut. Tujuan penelitian ini adalah untuk melakukan validasi penetapan kadar β-karoten dengan metode spektrofotometri UV-Vis dan menerapkannya pada sampel labu kuning. Parameter yang validasi antara lain akurasi, presisi, linieritas, limit deteksi dan limit kuantitas. Berdasarkan hasil yang telah dicapai dalam penelitian ini, maka dapat disimpulkan bahwa kinerja analitik penetapan kadar β-karoten dengan Spektrofotometri UV-Vis tergolong sangat baik, hal ini ditunjukkan dengan parameter pengukuran seperti: akurasi yang ditunjukkan oleh persen perolehan kembali pada rentang 98 – 101 % , presisi ditunjukkan dengan koefisien variasi (KV) = 1,079%, linearitas ditunjukkan dengan koefisien korelasi (r) = 0,9996, batas deteksi (LOD) = 0,0011 ppm, dan batas kuantitasi (LOQ) = 0,0036 ppm, yang semuanya memenuhi persyaratan. Kadar β-karoten dalam jonjot buah labu kuning yang dianalisa berkisar antara 9,52 – 13,76 μg/gram sampel.
"Optimasi Absorpsi Ion Logam Zn Menggunakan Arang Daun Eceng Gondok (Eichhornia crassipes) Sebagai Absorben" hesky julio koloay; Abdon Saiya; Soenandar Tengker
Jurnal Kimia Fullerene Vol 8 No 2 (2023): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v8i2.566

Abstract

Tanaman eceng gondok (Eichhornia crassipes) sebagian besar tersusun dari selulosa dimana selulosa yang terdapat dalam eceng gondok ini yang menjadi situs aktif dalam proses penyerapan ion logam. Penelitian ini bertujuan untuk melakukan optimasi terhadap absorpsi ion logam Zn dengan menggunakan arang daun eceng gondok. Arang eceng gondok dikontakkan pada larutan seng dengan menggunakan parameter waktu kontak dan pH kemudian diukur nilai absorpsinya dengan spektrofotometer serapan atom. Dari data yang diperoleh, waktu kontak optimum terjadi pada 60 menit dengan nilai absorpsi 1,91 ppm. Untuk pH optimum dari penyerapan ion logam seng terjadi pada pH 6 dengan konsentrasi ion logam yang terserap sebesar 93,062 ppm.
Co-Authors Avni Dalemeng Deysi Natalia Demo Dian Herlinda Octorina Howan Djefry Tani Dokri Gumolung Freetje Waworuntu hesky julio koloay Jeivana Laluas Joice Dorsila Susana Caroles Lauren Cornelia Agatha Rini Yasinta Sasuang Soenandar Tengker