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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 JKPK (Jurnal Kimia dan Pendidikan Kimia) Journal of Banua Science Education Jurnal Ilmiah Berkala: Sains dan Terapan 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 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.

Characterization of Alginate-Cellulose-Kaolin Composites for Slow-Release Urea Fertilizer Sunardi Sunardi; Gusti Nia Faramitha; Uripto Trisno Santoso
Indonesian Journal of Chemical Research Vol 8 No 3 (2021): Edition for January 2021
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2021.8-sun

Research on the effect of cellulose and kaolin addition to alginate-cellulose-kaolin composites' characteristics as a slow-release agent of urea fertilizer has been done. The technique used in composites' preparation is an extrusion technique using 2% CaCl2 solution as a cross-linker. The compositions of alginate-cellulose-kaolin were varied to determine their effect on composites' characteristics such as diameter, color, swelling ratio, entrapment efficiency, and release of urea. The results showed that the diameter of beads in wet condition produced ranges from 2.98 to 3.54 mm, whereas the diameter of dry beads ranges from 1.22 to 1.92 mm. The addition of cellulose and kaolin affected the color of the beads produced based on CIE Lab analysis. The value of the swelling ratio decreased with the addition of cellulose and kaolin. The entrapment efficiency of urea in beads obtained ranged from 37.25 to 45.06%. The release of urea in aqueous media showed that cellulose and kaolin's addition into the alginate affected the amount of released urea.

Synthesis and Characterization Nanosilica from Rice Husk Ash Using Sol-Gel Method with Addition Of PEG-6000 and PVA Dwi Rasy Mujiyanti; Uripto Trisno Santoso; Mutiara Dwi Saptarini; Nur Heirani Emi
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 6, No 3 (2021): 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.v6i3.54320

Nano-silica (NS) from rice husk ash was successfully synthesized using a sol-gel process with the addition of polyethylene glycol (PEG) 6000 and polyvinyl alcohol (PVA) as a template. The purpose of this study is to investigate the properties of NS functional groups and the effect of PEG6000 and PVA concentrations (5%, 10%, and 15% (b / v)) on the size, morphology, and distribution of nanosilica. The functional groups of NS are characterized by Fourier transform infrared (FTIR), the size and morphology of NS are characterized by scanning electron microscopy (SEM). In contrast the size analyzer characterizes the particle size distributionof particulate matter (PSA). The results indicated that the addition of PEG-6000 and PVA affected the size and morphology of NS. The FTIR spectra showed the presence of silanol (Si-OH) and siloxane (Si-O-Si) groups. According to the SEM results, the morphology of NS -PEG is round and relatively more uniform than the amorphous morphology of NS-Control and NS-PVA. Instead of PEG-6000, Sol-gel PVA can be obtained with a narrow particle size distribution.

Effect of Chitosan Concentration on Macroporous Chitosan-TPP Beads toward Turbidity, Dye Content, and COD of Sasirangan Wastewater Dahlena Ariyani; Dwi Rasy Mujiyanti; Uripto Trisno Santoso; Riana Maulana; Retno Elya Rohmah; Utami Irawati
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 6, No 3 (2021): 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.v6i3.54259

This research was carried out to determine the effect of chitosan concentration in synthesising crosslinked tripolyphosphate (TPP) macropore beads on turbidity, dye content, and Chemical of Demand (COD) Sasirangan wastewater. Macroporous chitosan-TPP beads were synthesised from chitosan solution with various concentrations of 2%, 3%, 4%, and 5% and added NaHCO3 as a porogen, then dripped into 0.75% tripolyphosphate solution. It was further interacted with Sasirangan wastewater by adsorption method with its effect analysed by using the turbidity value, dye content, and COD. The results showed that beads with a 3% chitosan concentration were the most effective in reducing the turbidity, dye content, and COD value. Furthermore, using a more than 3% chitosan concentration indicates reduced effectiveness. Macroporous Chitosan-TPP beads were able to produce a decrease in turbidity, dye content and COD by 81.21%, 55.44%, and 59.37%.

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.

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 Gusti Nia Faramitha Hanung Adi Nugroho Hasanah Hasanah Herdiansyah Herdiansyah Herdiansyah Herdiansyah Jihan Askia Kamilia Mustikasari Kamilia Mustikasaria Karlini Karlini Kholifatu Rosyidah Kiki Miranti Leo Saputra Maria Dewi Astuti Melissa Melissa Mutiara Dwi Saptarini Nur Heirani Emi Puput Nopitasari Radhina Oktari Radna Nurmasari 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, Ph.D., Sunardi Syahmani Syahmani Taufiqur Rohman Utami Irawati

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