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Joice Dorsila Susana Caroles

Universitas Negeri Manado

Author-ID : 3792282

Chemistry Education

Published : 15 Documents Claim Missing Document

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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

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.

Penurunan konsentrasi logam kromium dengan fotokatalis titanium dioksida (TiO2), dan absorben SiO2-CFA Joice Dorsila Susana Caroles
Jurnal Kimia Fullerene Vol 3 No 1 (2018): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Decrease in the concentration of chromium metal by photocatalysis process, and adsorption has been done on river water samples. Photocatalysis using TiO2 photocatalyst, while adsorption using SiO2 CFA adsorbent was done with the aim of obtaining a picture of the effectiveness between the use of photocatalysis process and the adsorption process to reduce the concentration of chromium metal. The decrease of chromium metal concentration after photocatalysis, and adsorption for 6 hours was analyzed by AAS. Result of analysis showed decrease of chromium metal concentration through bigger photocatalysis that is 79,30% compared through adsorption only equal to 39,4%.

Imobilisasi silika ke dalam TiO2 untuk fotokatalis Joice Caroles
Jurnal Kimia Fullerene Vol 2 No 2 (2017): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Modification of TiO2 photocatalyst with SiO2 absorbent has been performed. Modification is done by immobilizing SiO2 into TiO2. Photocatalyst of TiO2-SiO2 result from immobilization, then analyzed using SEM-EDS instrument. The analysis was performed to see the immobilized silica. The results of the analysis showed that the silica content of 47.90% immobilized on TiO2 photocatalyst.

Optimasi Spesiasi Kromium Ke Bentuk Cr(III) - Tanat Jenifer Alfonda Walewangko; Djefry Tani; Joice Caroles
Jurnal Kimia Fullerene Vol 5 No 1 (2020): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

This research was conducted to determine the heavy metal species of Cr (III). Determination of heavy metals is determined based on the required chromium species using the UV-Vis spectrophotometry method. The sample used was CrCl3.H2O and the complexing agent was tannic acid. This research was conducted to determine the effect of pH, concentration and time of stability by finding the optimum conditions of the chromium - tanic acid complex. The optimum pH is at pH 11, the optimum concentration is at a ratio of 5: 1 concentration (Cr: tanic acid), the stability of time is at the 10th minute.

Ekstraksi silika yang terkandung dalam limbah abu terbang batu bara Joice Dorsila Susana Caroles
Jurnal Kimia Fullerene Vol 4 No 1 (2019): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Coal fly ash waste contains metal oxides, one of which is silica. The presence of silica in coal fly ash allows the waste to be used directly as an adsorbent. The use of silica contained in coal fly ash can be carried out maximally by silica purification. Silica purification by extracting silica from coal fly ash aims to minimize unnecessary metal oxide levels (impurities). Analysis of silica content carried out before and after the extraction process aims to determine the levels of silica compared to other metal oxides. The procedure is done, namely sieving to separate samples from impurity material, then analyzing using SEM-EDS instruments, and then proceed with the silica extraction process. The results of the analysis showed a greater percentage of silica (SiO2) content of 67.68% compared to Al2O3 of 16.80%; while the extracted silica content was 80.42%.

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

Salah satu teknik instrumentasi yang akurat, sensitif dan selektif untuk penentuan kadar ÃŽÂ²-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 ÃŽÂ²-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 ÃŽÂ²-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 Ã¢â‚¬â€œ 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 ÃŽÂ²-karoten dalam jonjot buah labu kuning yang dianalisa berkisar antara 9,52 Ã¢â‚¬â€œ 13,76 ÃŽÂ¼g/gram sampel.

Co-Authors Abdon Saiya Alfath Fitrilia Taraufu Djefri Tani Djefry Tani Dokri Gumolung Elvian Anggelina Soru Emma Julin Pongoh Fladi Rivera Kalubota gerry lumolos Glory Kurnia Margarith Sirih Hardin Foster Rares Ilham Mahmud Jenifer Alfonda Walewangko Loriana Tiak Misye Gamastri Sumampow Oktaviani Rampi Sofia Krisen Sonny Lumingkewas

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