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All Journal Jurnal Inovasi Pendidikan IPA Konversi Jurnal Fisika FLUX Info-Teknik EnviroScienteae Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Pelayanan dan Pengabdian Masyarakat (Pamas) Journal of Banua Science Education Jurnal Ilmiah Berkala Sains dan Terapan Kimia Molekul: Jurnal Ilmiah Kimia

Uripto Trisno Santoso

Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Lambung Mangkurat University Jl. Jend. Ahmad Yani KM 36 Banjarbaru, South Kalimantan 70714

Author-ID : 371137

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Pemahaman konsep IPA siswa SMP melalui pembelajaran problem solving pada topik perubahan benda-benda di sekitar kita Sadiqin, Ikhwan Khairu; Santoso, Uripto Trisno; Sholahuddin, Arif
Jurnal Inovasi Pendidikan IPA Vol 3, No 1: April 2017
Publisher : Program Pascasarjana, Universitas Negeri Yogyakarta (UNY)

Telah dilakukan penelitian untuk mendeskripsikan pemahaman konsep IPA siswa SMP melalui pembelajaran problem solving. Teknik pemilihan sampel dilakukan secara purposive sampling. Subyek penelitian ini adalah siswa kelas VII berjumlah 66 orang. Data penelitian diperoleh menggunakan instrumen tes. Teknik analisis data dengan cara melihat perkembangan n-gain. Hasil penelitian diperoleh rata-rata pemahaman konsep siswa sebelum pembelajaran adalah 52,28 tergolong kategori kurang baik. Skor setelah pembelajaran adalah 77,40 tergolong kategori baik. Model problem solving sesuai untuk pembelajarain sains sekolah menengah pertama dan dapat mendorong siswa untuk membangun pemahaman konsep. Terjadi konstruksi pemahaman konsep siswa melalui proses menghubungkan pengetahuan dalam menyelesaikan masalah pembelajaran.Kata kunci: problem solving, pemahaman konsep, pengetahuan deklaratif, pengetahuan prosedural, perubahan benda-benda di sekitar kita. Junior High School Students? Understanding of the Science Concept Through Problem Solving Learning on the Topic of Change Things Around our Life AbstractResearch was conducted to describe the results of student learning through problem solving model. Sampling was done by purposive sampling. Subjects are 66 students of class VII. Data were obtained using paper based test. Data analysis techniques by observing the development of n-gain. This study showed that student understanding of pretest is 52,28 point categorized as low and posttest is 77,40 point categorized as good. It mean that the problem solving model suitable to the junior high school science class and encourage students to constantly build understanding of the concept. Construction of the concept through the process of connecting knowledge in solving learning problems.Keywords: problem solving, conceptual understanding, declarative knowledge, procedural knowledge, changes things around us.

POTENSI ASAP CAIR PADA PRODUKSI ARANG KAYU MODEL DESA RANGGANG TANAH LAUT Ahmad Budi Budi Junaidi; Abdullah Abdullah; Uripto Trisno Santoso
Konversi Vol 8, No 1 (2019): April 2019
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v8i1.6512

Abstrak- Desa ranggang merupakan sentra produksi arang kayu di Kalimantan Selatan. Arang kayu diproduksi dalam tungku dari tanah liat berbentuk kubah dengan diameter sekitar 4 meter dan tinggi 3-4 meter. Di Desa Ranggang ini terdapat lebih dari 500 buah tungku dengan kapasitas produksi arang kayu sekitar 2-3 ton arang/tungku untuk tiap kali produksi. Asap yang keluar dari tungku arang pada proses produksi arang jumlahnya sangat besar selama ini terlepas ke lingkungan yang berpotensi menimbulkan polusi udara dan mengganggu pengrajin arang tersebut.. Penelitian tentang potensi asap cair sebagai produk samping pembuatan arang kayu desa ranggang tersebut dilakukan dengan memodifikasi model tungku arang desa Ranggang berupa penambahan instalasi kondensasi asap pada bagian knalpot tungku. Tungku arang percontohan telah dibuat dengan kapasitas produksi 3 ton arang setiap kali produksi. Bahan baku yang digunakan adalah limbah kayu ulin (Eusideroxylon zwageri Teijsm. & Binn.). Asap cair yang diperoleh dari tungku tersebut sejumlah 47 liter untuk setiap kali produksi. Asap cair yang dihasilkan didominasi fraksi suhu 95-105 0C, yaitu sebanyak 81%, memiliki kadar asam (dihitung sebagai asam asetat) 0,825 molar dengan pH berkisar. 2,91-3,08. Kata kunci: asap cair, produk samping, produksi arang, kondensasi asap dan tungku arang Ranggang

Pengaruh Penyaringan dan Pengeringan Terhadap Ukuran Partikel Oksida Besi: Tinjauan Karakterisasi Kualitatif Menggunakan Mikroskop Optik Uripto Trisno Santoso; Rodiansono Rodiansono; Ahmad Budi Junaidi; Citra Ariyanti; Radhina Oktari; Puput Nopitasari; Hasanah Hasanah
Jurnal Fisika FLUX Vol 1, No 1 (2019): Jurnal Fisika Flux Edisi Khusus Januari 2019
Publisher : Lambung Mangkurat University Press

Karakterisasi ukuran partikel menjadi salah satu parameter yang sangat penting dalam uji keberhasilan sintesis mikro- maupun nanomaterial. Walaupun secara teori sudah diketahui bahwa beberapa perlakuan fisika seperti proses penyaringan dan pengeringan dapat berpengaruh terhadap ukuran partikel sampel, tetapi perlakuan ini sering diabaikan sehubungan dengan beberapa teknik karakterisasi, misalnya SEM (scanning electron microscopy) mempersyaratkan sampelnya berbentuk serbuk kering.Penelitian ini bertujuanuntukmendapatkan data imiahtentang pengaruh penyaringan dan pengeringan terhadap ukuran partikel oksida besidengan karakterisasi secara kualitatif menggunakan mikroskop optik. Hasil penelitian menunjukkan bahwa proses penyaringan dan pengeringan dapat mempengaruhi ukuran partikel.

PENENTUAN WAKTU REAKSI DAN JUMLAH KATALIS (H2¬SO4 DAN KOH) OPTIMUM PADA PEMBUATAN BIODIESEL DARI MINYAK GORENG BEKAS Abdullah Abdullah; Dorothy Eka Ria; Uripto Trisno Santoso; Kholifatu Rosyidah
INFO-TEKNIK Vol 11, No 1 (2010): INFOTEKNIK VOL. 11 NO. 1 2010
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/infotek.v11i1.1768

Research of determination of optimum reaction time and number of catalyst (H2SO4 and KOH) at biodiesel production from waste cooking oil had been done. Aim of this research is to get the optimum reaction time and number of catalyst (H2SO4 and KOH), and the main chemical compound of biodiesel from waste cooking oil. Biodiesel from waste cooking oil is made from esterification reaction using H2SO4 2% w/w as acid catalyst, continued by transesterification reaction using KOH as base catalyst. The variables which is used in the research were the reaction time of esterification (45, 90, and 135 minutes) and transesterification (60, 120, and 180 minutes), while variation number of acid catalyst were 0,5; 1,0; 1,5 ml and base catalyst were 0,5; 1,0; 1,5 g. The optimum reaction time and number of catalyst were determined based on biodiesel characteristics are acid number, kinematics viscosity, and density. The characteristics were compared with waste cooking oil characteristic and SNI standard for biodiesel. Main chemical compound was determined by GC-MS instrument. Based on the research result obtained the optimum quality of methyl ester with acid number was 0,19 mg KOH/g, kinematics viscosity (40oC) was 4,51 mm2/s, and density was 0,875 g/ml. Concluded that the reaction time of esterification was 90 minutes and transesterification was 120 minutes, with number of catalyst H2SO4 2% w/w was 0,5 ml and KOH was 1,0 g for oil was 50 ml. Main chemical compound of biodiesel were methyl lauric, methyl myristic, methyl palmitic, and methyl oleic, respectively.

KEPRAKTISAN PERANGKAT PEMBELAJARAN DENGAN MODEL PEMBELAJARAN INKUIRI TERBIMBING PADA MATERI MATERI ZAT ADITIF DAN ZAT ADIKTIF Kiki Miranti; Syahmani Syahmani; Uripto Trisno Santoso
Journal of Banua Science Education Vol 2, No 1: 2021
Publisher : Universitas Lambung Mangkurat

Students in Indonesia have problems in critical reading competence and understanding in the field of science in the form of misconceptions. This is indicated by the fact that students in Indo-nesia are only able to solve routine problems and will have difficulty when faced with unusual problems. In addition, this problem is also exacerbated by the unavailability of laboratory facili-ties and the process of critical thinking skills has not been implemented properly. The purpose of this study was to develop science learning tools to improve the critical thinking skills of junior high school students on additive and addictive substances. This study uses the development of learning tools with the Tessmer model. Starting from the self-evaluation stage, prototyping (vali-dation, evaluation/FGD, and revision), then field test. The learning tools developed include the syllabus, lesson plans, teaching materials, LKPD, assessment sheets, and LP to practice critical thinking skills. Data collection techniques were carried out through observation, teacher and student activities, documentation, and tests of learning outcomes and critical thinking. The trial subjects were 51 people who were divided into 3 stages of prototype testing with different stu-dents at each stage. The results of the development and research show that the learning tools de-veloped are considered practical so that they are feasible to use. The results of the research find-ings are that there is a tendency for the initial knowledge level of students to be weak and low concept understanding caused by interest in learning and low literacy levels.Keywords: guided inquiry, science, critical thinking skills, development research. AbstrakPeserta didik di Indonesia mempunyai permasalahan dalam kompetensi membaca kritis dan pemahaman pada bidang studi IPA dalam bentuk miskonsepsi. Hal ini ditunjukkan dengan peserta didik di Indonesia hanya mampu menyelesaikan permasalahan rutin dan akan mengalami kesulitan ketika menghadapi masalah yang tidak biasa. Selain itu permasalahan ini juga diperparah dengan tidak tersedianya fasilitas laboratorium dan proses keterampilan berpikir kritis belum dilaksanakan dengan baik. Tujuan dari penelitian ini adalah untuk mengembangkan perangkat pembelajaran IPA untuk meningkatkan keterampilan berpikir kritis peserta didik SMP pada materi zat aditif dan adiktif. Penelitian ini menggunakan pengembangan perangkat pembelajaran dengan model Tessmer. Mulai dari tahap Self-evaluation, prototyping (validasi, evaluasi/FGD, dan revisi), kemudian field test. Perangkat pembelajaran yang dikembangkan meliputi silabus, RPP, materi ajar, LKPD, lembar penilaian, dan LP untuk melatihkan keterampilan berpikir kritisnya. Teknik pengumpulan data dilakukan melalui observasi, aktivitas guru dan peserta didik, dokumentasi, dan tes hasil belajar dan berpikir kritis. Subjek uji coba sebanyak 51 orang yang terbagi dalam 3 tahapan uji prototipe dengan siswa yang berbeda di tiap tahapannya. Hasil pengembangan dan penelitian menunjukkan bahwa perangkat pembelajaran yang dikembangkan dinilai praktis sehingga layak untuk digunakan. Hasil temuan penelitian yaitu ada kecenderungan tingkat pengetahuan awal peserta didik yang lemah serta pemahaman konsep yang rendah yang disebabkan oleh minat belajar dan tingkat literasi yang rendah.Kata kunci: inkuiri terbimbing, IPA, keterampilan berpikir kritis, penelitian pengembangan.

PENGARUH PEMBERIAN EKSTRAK BELIMBING WULUH (Averrhoa bilimbi) TERHADAP BERAT RESIDU FORMALIN IKAN TONGKOL (Euthynnus affinis) BERFORMALIN Aminonatalina Aminonatalina; Emmy Sri Mahreda; Ahmadi Ahmadi; Uripto Trisno Santoso
EnviroScienteae Vol 12, No 3 (2016): Enviroscienteae Volume 12 Nomor 3, November 2016
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/es.v12i3.2442

This study aimed to analyze the effects of the concentration and duration of submersion in the extract of ‘belimbing wuluh’ on the decrease of the weight of formaldehyde residue, and also to analyze the concentration and optimum submersion length of time to produce the decrease of the highest weight of formaldehyde residue on the formaldehyde tuna fish. The study used an experimental method. The design used was a completely factorial randomized design (CRD), using two factors: duration of soaking factor (A) and the concentration factor (B) extracts of ‘blimbing wuluh’. Factor (A) was implemented for 15 minutes, 30 minutes, 45 minutes and 60 minutes, while factor (B) was done for 0% (control), 20%, 40%, 60%, 80% and 100%. Based on the experiments, the research showed that prolonged submersion gave significant effects on decreasing the residual formaldehyde, while the extract concentration ‘blimbing wuluh’ gave very significant effect in reducing the residual formaldehyde of tuna fish. For optimum results, a concentration of 60% with prolonged submersion for 30 minutes resulted in the reduction of residual formaldehyde percentage of 81.25%, the highest percentage compared with other treatments.

IMMOBILIZATION OF HUMIC ACID ONTO CHITOSAN USING TOSYLATION METHOD WITH 1,4-BUTANEDIOL AS A SPACER ARM Uripto Trisno Santoso; Radna Nurmasari; Dewi Umaningrum; Sri Juari Santosa; Bambang Rusdiarso; Dwi Siswanta
Indonesian Journal of Chemistry Vol 12, No 1 (2012)
Publisher : Universitas Gadjah Mada

Immobilization of humic acid (HA) onto chitosan using tosylation method with 1,4-butanediol as a spacer arm has been evaluated. Chitosan was phthaloylated selectively using phthalic anhydride in dimethylformamide as solvent with addition of 5% water (v/v) as cosolvent prior to be tosylated. N-phthaloyl-chitosan and HA were tosylated using tosyl chloride in excess and triethylamine as catalyst at temperature < 10 °C for 12 h. The 6-O-tosyl-N-phthaloyl-chitosan was reacted with 1,4-butanediol in order to obtain a spacer arm attached chitosan. The 6-O-butanol-N-phthaloyl-chitosan was activated by reacting with tosyl chloride. For evaluation on immobilization of HA on chitosan with and without spacer arm, 6-O-tosylbutane-N-phthaloyl-chitosan was reacted with HA and the 6-O-tosyl-N-phthaloyl-chitosan was reacted with HA. The HA immobilized onto chitosan was characterized by XRD and FTIR spectrophotometric method. The result showed that HA can be immobilized covalently onto chitosan after attaching 1,4-butanediol as spacer arm onto 6-O-tosyl-N-phthaloyl-chitosan and activating the product with tosyl chloride, but HA cannot be reacted directly onto 6-O-tosyl-N-phthaloyl-chitosan.

CHARACTERIZATION OF SORBENT PRODUCED THROUGH IMMOBILIZATION OF HUMIC ACID ON CHITOSAN USING GLUTARALDEHYDE AS CROSS-LINKING AGENT AND Pb(II) ION AS ACTIVE SITE PROTECTOR Uripto Trisno Santoso; Sri Juari Santosa; Dwi Siswanta; Bambang Rusdiarso; Shogo Shimazu
Indonesian Journal of Chemistry Vol 10, No 3 (2010)
Publisher : Universitas Gadjah Mada

Sorbent produced through immobilization of humic acid (HA) on chitosan using glutaraldehyde as cross-linking agent and Pb(II) ions as active site protector has been characterized. Active sorption site of HA was protected by reacting HA with Pb(II) ion, and the protected-HA was then activated by glutaraldehyde, crosslinked onto chitosan, and deprotected by 0.1 M disodium ethylenediamine tetra-acetic acid (Na2EDTA). The protected-crosslinking method enhanced the content of immobilized-HA and its chemical stability. Based on the FTIR spectra, crosslinking of HA on chitosan probably occurred through a chemical reaction. The sorption capacity of sorbent still remains unchanged after the second regeneration, but some of HA start to be soluble. The latter shows that cross-linking reaction between HA and chitosan is through formation an unstable product. The effectiveness of sorbent regeneration can also be identified by the XRD pattern.

ADSORPTION KINETICS OF Pb(II), Cd(II) AND Cr(III) ON ADSORBENT PRODUCED BY PROTECTED-CROSSLINKING OF HUMIC ACID-CHITOSAN Dewi Umaningrum; Uripto Trisno Santoso; Radna Nurmasari; Rahmat Yunus
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Study on adsorption kinetics of of Pb(II), Cd(II) and Cr(III) on adsorbent which was produced by protected-crosslinking of humic acid-chitosan has been done. The Langmuir-Hinshelwood, pseudo first- and second-order kinetics models were used to describe the kinetic data, and the rate constants of adsorption were also evaluated. The experimental data fitted well the second-order kinetics model, indicating that the chemical sorption is the rate-limiting step, instead of mass transfer. The initial metal ion concentration significantly affects the adsorption rate. An increase in initial metal ion concentration results in the decrease in adsorption rate of the metals.

IMMOBILIZATION OF HUMIC ACID ON CHITOSAN BEADS BY PROTECTED CROSS-LINKING METHOD AND ITS APPLICATION AS SORBENT FOR Pb(II) Radna Nurmasari; Uripto Trisno Santoso; Dewi Umaningrum; Taufiqur Rohman
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Immobilization of humic acid (HA) on chitosan beads has been done using a protected cross-linking reaction method and the product was then utilized as sorbent for Pb(II). Protection of the active sites of HA was carried out by interacting HA with Pb(II) before performing the cross-linking reaction in order to maintain its adsorption capacity. Protected-HA was cross-linked with chitosan beads using glutaraldehyde in order to obtain sorbent insoluble both in aqueous acidic and basic solution. The result showed that the amount of immobilized HA on beads chitosan was 88.60% by weight. The adsorption capacity of the protected-sorbent beads for Pb(II) was 784 mg/g. As a comparison, the adsorption capacity of the non-protected sorbent beads for Pb(II) was only 142 mg/g.

Co-Authors A.A. Ketut Agung Cahyawan W Abdullah Abdullah Abdullah Abdullah Abdullah Abdullah Ade Mutia Rahmah Adi Maulana Ahmad Budi Junaidi Ahmad Riadi Amelia Harianti Aminonatalina Aminonatalina Arif Sholahuddin Azidi Irwan Bambang Rusdiarso Bambang Rusdiarso Budi Junaidi, Budi Citra Ariyanti Dahlena Ariyani Dewi Umaningrum Dorothy Eka Ria Dwi Rasy Mujiyanti Dwi Rasy Mujiyanti Dwi Rasy Mujiyanti Dwi Siswanta Dwi Siswanta Dwi Siswanta Dwi Siswanta Eka Puspita Romadhoni Emmy Sri Mahreda Faramitha, Gusti Nia Hasanah Hasanah Herdiansyah Herdiansyah Herdiansyah Herdiansyah Hilma, Nabila Khairiyatul Idris, Muddatstsir Jihan Askia Kamilia Mustikasari Kamilia Mustikasaria Karlini Karlini Kholifatu Rosyidah Kiki Miranti Leo Saputra Maria Dewi Astuti Melissa Melissa Muhammad Agus Muljanto Mutiara Dwi Saptarini Nur Heirani Emi Pradita, Hapsari Tyas Puput Nopitasari Radhina Oktari Radna Nurmasari Rahmat Eko Sanjaya Rahmat Yunus Rahmat Yunus Rahmat Yunus Retno Elya Rohmah Riana Maulana Risnu Aritofa Rodiansono Rodiansono Sadiqin, Ikhwan Khairu Shogo Shimazu Sri Juari Santosa Sri Juari Santosa Sri Juari Santosa Sri Juari Santosa Sri Juari Santosa Sulfi Adam Sunardi Sunardi Syahmani Syahmani Taufiqur Rohman Umi Baroroh Lili Utami Utami Irawati Wiwin Tyas Istikowati

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