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ANALISIS PENGELOLAAN ALAT DAN BAHAN PRAKTIKUM PADA LABORATORIUM KIMIA DI SMA NEGERI 1 TAMPAKSIRING Shintya Dewi, Dewa Ayu Kadek Dian; Sastrawidana, Dewa Ketut; Wiratini, Ni Made
Jurnal Pendidikan Kimia Undiksha Vol 3, No 1 (2019)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpk.v3i1.21162

Abstract

Abstrak Penelitian ini bertujuan untuk mendeskripsikan dan menjelaskan (1) pengelolaan alat dan bahan praktikum di SMA Negeri 1 Tampaksiring dilihat dari aspek perencaaan, pengadaan, penggunaan, pemeliharaan, inventarisasi, serta pemusnahan alat dan bahan yang rusak, dan (2) hambatan-hambatan yang dialami dalam mengelola alat dan bahan praktikum. Penelitian ini merupakan penelitian kualitatif dengan pendekatan fenomenologi. Data penelitian dikumpulkan melalui observasi, wawancara, dan dokumentasi. Hasil penelitian menunjukkan bahwa (1) pengelolaan alat dan bahan praktikum pada laboratorium kimia belum dilaksanakan dengan optimal, khususnya pada aspek pengadaan, penggunaan, pemeliharaan, inventarisasi, dan pemusnahan, (2) terdapat beberapa hambatan dalam mengelola alat dan bahan praktikum, yaitu a) pada proses pengadaan yaitu keterbatasan dana, b) pada penggunaan yaitu kondisi laboratorium yang digunakan sebagai ruangan kelas, kurangnya waktu, dan keterbatasan alat dan bahan praktikum, c) pada proses pemeliharaan dan inventarisasi yaitu waktu dan tenaga ahli, serta d) pada proses pemusnahan yaitu sulitnya mencari tempat untuk lubang pembuangan dan pemahaman guru yang kurang. Kata kunci: alat dan bahan praktikum, laboratorium kimia, pengelolaan. Abstract This research aimed to describe and explain (1) the management of practicum equipment and materials at SMA Negeri 1 Tampaksiring viewed from the aspects of planning, procuring, utilizing, maintaining, inventoring, and disposing of the broken practicum equipment and materials, and (2) the obstacles in managing practicum equipment and materials. This research was a qualitative research with a phenomenologyy approach. The research data was collected through observation, interviews, and documentation. The results of this research show that (1) the management of practicum equipment and materials has not been implemented optimally, especially in the aspects of procuring, utilizing, maintaining, inventoring, and disposing, (2) there are several obstacles in managing practicum equipment and materials, were a) in procuring prosses is funding, b) in utilizing prosses are laboratory conditions which is used as classroom, lack of time, and the limited practicum equipment and materials, c) in maintaining and inventoring prosses are lack of time and expertise, and d) in disposing prosses are the difficulty of finding a place for drainage holes and lack of understanding of teacher. Keywords: practicum equipment and materials, chemistry laboratory, management
MODEL MENTAL SISWA PADA SUBPOKOK BAHASAN PERUBAHAN MATERI Diantari, Putu Eka Sukma; Suja, I Wayan; Sastrawidana, I Dewa Ketut
Jurnal Pendidikan Kimia Undiksha Vol 2, No 2 (2018)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpk.v2i2.21168

Abstract

AbstrakPenelitian ini bertujuan mendeskripsikan dan menjelaskan profil model mental siswa serta mengidentifikasi faktor-faktor penyebab terbentuknya model mental alternatif siswa pada subpokok bahasan perubahan materi di SMP Negeri 2 Singaraja. Penelitian ini menggunakan pendekatan mix methods jenis sekuensial. Pengumpulan data dilakukan dengan observasi, pemberian tes diagnostik dua tingkat (two-tier), dan wawancara. Hasil penelitian menunjukkan profil model mental siswa kelas VII pada subpokok bahasan perubahan materi 5,30% tergolong model mental ilmiah, serta 92,38% mengalami model mental alternatif, yang meliputi 69,81% memiliki model mental benar sebagian dan 22,57% memiliki model mental miskonsepsi khusus. Sedangkan sisanya, sebanyak 2,32% tidak memberikan tanggapan. Faktor penyebab terbentuknya model mental alternatif pada pikiran siswa, meliputi minat dan motivasi belajar siswa rendah, pemaknaan konsep-konsep perubahan materi rendah, pemahaman konsep pendukung terkait perubahan materi rendah, pemahaman terhadap ketiga level kimia (level makroskopis, level submikroskopis, dan level simbolik) beserta interkoneksinya rendah, buku teks (paket) yang digunakan kurang lengkap, dan strategi mengajar yang diterapkan oleh guru tidak tepat.Kata-kata kunci: perubahan materi, model mental, model mental alternatif.AbstractThis research was aimed to describe and explain the profile of mental model students and identify the factors that cause the formation of an alternative mental model students on the subject of material changes at SMP Negeri 2 Singaraja. This research is a mix methods approach, type sequential. Data collection was carried out by observation, giving two-tier diagnostic tests, and interviews. The results showed the profile of mental class VII grade students on the  subject of  material change 5.30% classified as a scientific mental model, and 92.38% experienced an alternative mental model, which included 69.81% having a partially correct mental model and 22.57% having special mental misconception models. While the rest, as much as 2.32% did not give a response. Factors that cause the formation of alternative mental models on students minds, including low interest and student learning motivation, meaning concepts of low material change, understanding of supporting concepts related to low material changes, understanding of all three chemical levels (macroscopic level, submicroscopic level, and symbolic level) along with the low interconnection, the textbook (package) used is incomplete, and the teaching strategy applied by the teacher is not appropriate.Keywords: change materials, mental model, alternative mental model
UJI KEPRAKTISAN LEMBAR KERJA SISWA YANG MENGGUNAKAN PENDEKATAN SAINTIFIK Megananda, Ayu Sayu Mas; Wiratma, I Gusti Lanang; Sastrawidana, I Dewa Ketut
Jurnal Pendidikan Kimia Undiksha Vol 2, No 1 (2018)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpk.v2i1.21178

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Abstrak Penelitian ini bertujuan untuk mendeskripsikan dan menjelaskan kepraktisan LKS pada pembelajaran kimia pokok bahasan larutan elektrolit dan nonelektrolit yang menggunakan pendekatan saintifik. Penelitian ini merupakan penelitian pengembangan yang dilakukan dengan beberapa tahap, yaitu: (1) pengumpulan data; (2) desain produk; (3) validasi desain; (4) revisi desain (5) uji coba produk; dan (6) revisi produk. Validitas LKS melibatkat dua ahli isi, satu ahli bahasa, dan dua praktisi. Uji coba produk dilakukan dengan uji coba lapangan terbatas yang melibatkan sembilan siswa kelas XI SMAN 1 Kuta Selatan. Hasil uji kepraktisan diperoleh bahwa siswa memberikan respon positif terhadap LKS menggunakan pendekatan saintifik Kata kunci: lembar kerja siswa, pendekatan saintifik, larutan elektrolit dan nonelektrolit. Abstract This study was conducted aimed at describing and explaining the practicality of LKS in learning the subject chemistry of electrolyte and non-electrolyte solutions that use a scientific approach. This research is a development research carried out in several stages, namely: (1) data collection; (2) product design; (3) design validation; (4) design revisions (5)  product trials; and (6) product revisions. The validity of the LKS involved two content experts, one linguist, and two practitioners. The product trial was conducted with a limited field trial involving nine students of class XI SMAN 1 Kuta Selatan. The practicality test results obtained that students gave a positive response to the LKS using a scientific approach Keywords:    student worksheets, scientific approach, electrolyte solutions and nonelectrolytes.
DEGRADASI ZAT WARNA REMAZOL YELLOW FG DAN LIMBAH TEKSTIL BUATAN DENGAN TEKNIK ELEKTROOKSIDASI ., I Wayan Sapta Pratama Ariguna; ., Ni Made Wiratini, S.Pd.; ., Dr. I Dewa Ketut Sastrawidana,S.Si, M.
Jurnal Pendidikan Kimia Undiksha Vol 1, No 1 (2017)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpk.v1i1.4447

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Penelitian ini bertujuan untuk (1) menentukan kondisi optimum konsentrasi larutan NaCl, waktu elektrooksidasi dan jarak antara kedua elektroda grafit pada degradasi zat warna Remazol Yellow FG dengan teknik elektrooksidasi, (2) menentukan efisiensi degradasi zat warna Remazol Yellow FG pada kondisi optimum dengan teknik elektrooksidasi, (3) menentukan efisiensi degradasi limbah tekstil buatan pada kondisi optimum dengan teknik elektrooksidasi. Penelitian ini termasuk penelitian eksperimen. Subjek penelitian ini adalah zat warna tekstil Remazol Yellow FG dan limbah tekstil buatan. Obyek adalah konsentrasi zat warna Remazol Yellow FG dan absorbansi limbah tekstil buatan sebelum dan setelah degradasi pada kondisi optimum. Pengukuran konsentrasi Remazol Yellow FG dan limbah tekstil buatan setelah didegradasi dilakukan dengan menggunakan UV-VIS Shimadzu 1700 pada λmax 414 nm dan 598 nm. Hasil penelitian menunjukkan bahwa kondisi optimum untuk mendegradasi Remazol Yellow FG diperoleh pada konsentrasi larutan NaCl 0,5M, waktu elektrooksidasi selama 2,25 jam dan jarak antara kedua elektroda 0,1cm dengan efisiensi degradasi sebesar 99,77%. Efisiensi degradasi limbah tekstil buatan yang dielektrooksidasi pada kondisi optimum diperoleh sebesar 99,04%Kata Kunci : efisiensi degradasi, limbah tekstil buatan, Remazol Yellow FG, teknik elektrooksidasi This study is aimed to (1) determine the optimum condition of NaCl concentration, the electrooxidation time and the distance between electrode to degrade Remazol Yellow FG by using electrooxidation technique, (2) determine the degradation efficiency of Remazol Yellow FG at optimum condition, (3) determine the degradation efficiency of artificial textile wastewater based on the value of absorbance at optimum condition by using electrooxidation technique. This study was an experimental research. The subjects of this study were Remazol Yellow FG and artificial textile wastewater. The objects were concentration of Remazol Yellow FG dye and absorbance of artificial textile wastewater before and after degradation at optimum condition. Concentration of Remazol Yellow FG and absorbance of artificial textile wastewater after degradation were measured by using UV-VIS Shimadzu 1700 at λmax 414 nm and 598 nm. The results showed that the optimum condition to degrade Remazol Yellow FG dye are at concentration of NaCl 0.5M, electrooxidation time of 2.25 hour and distance between electrode 0.1 cm with the efficiency of degradation is 99.77%. The efficiency of artificial textile wastewater in optimum condition is 99.04%keyword : artificial textile wastewater, degradation efficiency, electrooxidation technique, Remazol Yellow FG
KENDALA GURU DALAM PENYELENGGARAAN PENILAIAN SIKAP Sudiana, I. K.; Sastrawidana, I. D. K.; Antari, N. P. S.
Jurnal Pendidikan Kimia Undiksha Vol 2, No 2 (2018)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpk.v2i2.21169

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AbstrakPenelitian ini bertujuan untuk mengetahui penilaian sikap sebagai dampak pengiring pembelajaran kimia. Penelitian ini menggunakan jenis penelitian kualitatif dengan pendekatan fenomenologi. Subjek dalam penelitian ini adalah guru kimia. Aktivitas dalam penelitian ini yaitu penilaian sikap yang dilaksanakan oleh guru meliputi aspek perencanaan, pelaksanaan, penilaian, dan pengawasan. Metode pengumpulan data yang digunakan dalam penelitian ini adalah observasi, wawancara, dan studi dokumen. Data penelitian ini dianalisis menggunakan teknik kualitatif deskriptif. Teknik pemeriksaan keabsahan data dalam penelitian ini adalah menggunakan dua teknik triangulasi yaitu triangulasi sumber dan metode. Hasil penelitian ini menunjukkan bahwa, (1) guru kimia menyusun perencanaan penilaian sikap dengan mencantumkan semua sikap spiritual dan sikap sosial, serta merencanakan penilaian observasi, penilaian diri, dan penilaian antarteman. Namun mengalami hambatan dalam pelaksanaan sehingga tidak semua perencanaan penilaian sikap dapat dilakukan, (2) pada pelaksanaan guru melaksanakan pembelajaran tidak langsung yang berdampak pada pembentukan karakter siswa yang dilakukan dengan keteladanan, nilai karakter yang dimunculkan yaitu religius, toleran, disiplin, jujur, kerjasama, tanggung jawab, percaya diri, dan santun sedangkan guru menilai sikap hanya empat aspek nilai karakter yaitu tanggung jawab, rasa ingin tahu, disiplin, dan jujur, (3) penilaian sikap yang dilaksanakan oleh guru hanya menggunakan penilaian observasi dengan jurnal sedangkan penilaian antarteman dan penilaian diri tidak dilakukan karena hasil penilaian antarteman dan penilaian diri tidak sesuai dengan penilaian observasi yang dilaksanakan oleh guru saat pembelajaran, (4) proses pengawasan yang dilakukan didapatkan bahwa guru kimia mengalami kesulitan melakukan penilaian sikap karena instrumen yang berubah- ubah, jumlah siswa yang banyak, dan karakter siswa yang berbeda-beda.Kata kunci: penilaian sikap, dampak pengiring, karakterAbstractThis study aims to determine the assessment of attitude as an impact of chemistry learning accompaniment. This research uses qualitative research with a phenomenological approach. The subjects in this study were chemistry teachers. Activities in this research are attitude assessment carried out by teachers including aspects of planning, implementation, evaluation, and supervision. Data collection methods used in this study were observation, interviews, and document studies. The data of this study were analyzed using descriptive qualitative techniques. The data validity checking technique in this research is to use two triangulation techniques, namely source and method triangulation. The results of this study indicate that, (1) the chemistry teacher prepares an attitude assessment plan by listing all spiritual attitudes and social attitudes, as well as planning observations, self-assessments, and interpersonal assessments. But experience obstacles in implementation so that not all attitude assessment planning can be done, (2) the implementation of the teacher implements indirect learning that impacts on the formation of student character which is done by example, the character values that appear are religious, tolerant, disciplined, honest, cooperation, responsibility, confidence, and courtesy while the teacher assesses the attitude of only four aspects of character values, namely responsibility, curiosity, discipline, and honesty, (3) the attitude assessment carried out by the teacher only uses observation observation with journals while interpersonal assessment and assessment self is not done because the results of peer assessment and self-assessment are not in accordance with the assessment of observations carried out by the teacher during learning, (4) the monitoring process carried out found that chemistry teachers had difficulty doing attitudes because of changing instruments, the large number of students, and character s different iswa.Keywords: attitude assessment, accompaniment impact, character
UJI COBA UNIT PENGOLAHAN AIR LIMBAH SISTEM SEMIANAEROB-AEROB DI INDUSTRI PENCELUPAN TEKSTIL SKALA RUMAH TANGGA Sastrawidana, Dewa Ketut
Prosiding Seminar Nasional MIPA 2012: PROSIDING SEMINAR NASIONAL MIPA UNDIKSHA 2012
Publisher : Prosiding Seminar Nasional MIPA

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Abstract

AbstrakPenelitian ini bertujuan untuk menganalisis efektifitas unit pengolahan air limbah sistem semianaerob-aerob di industri pencelupan tekstil. Bakteri pada bak semianaerob terdiri dari Aeromonas sp. Pseudomonas sp, dan Flavobacterium sp. sedangkan pada bak aerob terdiri dari Vibrio sp. Plesiomonas sp. dan Enterobacter sp. Pembentukan biofilm dilakukan dengan menumbuhkan konsorsium bakteri pada masing-masing reaktor selama 10 hari menggunakan pada batu vulkanik merah sebagai media pelekatan bakteri. Setelah terbentuk biofilm,selanjutnya digunakan untuk merombak air limbah dengan waktu tinggal limbah 1 hari di bak semianaerob dan 1 hari di bak aerobi. Hasil penelitian menunjukkan unit pengolahan air limbah tekstil menggunakan teknologi biofilm cukup efektif digunakan untuk menangani air limbah tekstil skala lapang dengan efisiensi perombakan TSS, BOD dan COD secara berturut-turut sebesar 84,7%; 80,56% dan 90,40%. Uji toksisitas air limbah tekstil menggunakan ikan nila dengan waktu paparan 3 hari menunjukkan bahwa air limbah tekstil sebelum diolah berkatagori toksik ringan dengan nilai EC50 adalah 88,80% sedangkan setelah diolah dalam reaktor biofilm konsorsium bakteri sistem anaerob-aerob selama 2 hari menjadi katagori tidak toksik dengan nilai EC50 sebesar 101,64%. Dengan demikian, pengolahan limbah tektil dengan sistem kombinasi anaerob-aerob menghasilkan kualitas limbah dengan kriteria sudah memenuhi baku mutu untuk dibuang ke lingkungan.
STUDI PEROMBAKAN ZAT WARNA TEKSTIL REMAZOL RED RB SECARA AEROB MENGGUNAKAN BAKTERI ENTEROBACTER AEROGENES YANG DIISOLASI DARI LUMPUR LIMBAH TEKSTIL I Dewa Sastrawidana
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

The objective of this research is to study the potential use microorganism which is identified as Enterobacter aerogenes isolated from sludge of textile wastewater treatment plant. Reactor was operated to treat remazol red RB azo dyes under aerobic condition. The performance of the bioreactor was evaluated by monitoring color removal within various pH of the medium, dye concentrations and incubation times. The degradation products were characterized by UV–vis techniques. The result showed, Enterobacter aerogenes bacteria was able to successfully decolourize 75 mg/L of remazol red RB azo dyes under aerobic condition, at pH 7-8 and for seven days incubation with biodegradation efficiency of up to 87,9%.
PIGMEN MERAH DARI JAMUR YANG DIISOLASI DARI TANAH TEMPAT PEMBUANGAN LIMBAH SUSU I D. K. Sastrawidana; Siti Maryam; I Ketut Sudiana
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (73.843 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p02

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The use of synthetic dyes in enhancing the consumer appeal of the product is increasing, but most synthetic dyes are toxic, carcinogenic and difficult to degrade, causing environmental pollution. The purpose of this study is to analyze the characteristics of the red pigments produced by fungi isolated from soil contaminated with goat milk. Stages of research include semisolid fermentation using PDA and milk as a supporting medium for pigment production. Pigment analysis involves determining the characteristics of the spectrum as well as the stability of the colour upon pH and temperature treatments. The results showed that the spectrum of the red pigment from the fungus consisted of two peaks at 416 and 493 nm, the colour was stable at a temperature range of 40-90oC and at pH range of 5-8.
PEROMBAKAN AIR LIMBAH TEKSTIL MENGGUNAKAN JAMUR PENDEGRADASI KAYU JENIS Polyporus sp TERAMOBIL PADA SERBUK GERGAJI KAYU I D.K. Sastrawidana; Siti Maryam; I N. Sukarta
Bumi Lestari Journal of Environment Vol 12 No 2 (2012)
Publisher : Environmental Research Center (PPLH) of Udayana University

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Abstract

White-rot fungi produce ligninolytic enzymes including lignin peroxidase (LiP) and manganeseperoxidase (MnP). These enzymes can be applied to degrade azo textile dyes. The objective ofthis research was to study the potential of white-rot fungus which is identified as Polyporussp. for degrading textile wastewater. The Polyporus sp. was evaluated its ability to decolorizeazo dyes such as remazol black B and remazol red RB in solid media. Hereafter, the fungus wasimmobilized on sawdust and the results are used to reduce textile wastewater in an aerobicreactor system. The results revealed that the Polyporus sp. fungus immobilized on sawdust inan aerobic reactor system provides efficiency to decrease COD value up to 75,23%, BOD79,94%, TSS 53,18% and decolorization of textile dyes up to 73,48% within 7 days. Acutetoxicity test showed that moderate toxic textile categorized textile wastewater became lesstoxic.
PENGOLAHAN LIMBAH TEKSTIL SISTEM KOMBINASI ANAEROBIK-AEROBIK MENGGUNAKAN BIOFILM BAKTERI KONSORSIUM DARI LUMPUR LIMBAH TEKSTIL I Dewa K. Sastrawidana; Bibiana W. Lay; Anas Miftah Fauzi; Dwi Andreas Santosa
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 3 No 2
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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The objective of this research are to assess the eficiency of biodegradation of textile dyes by using bacteriaconsortium biofim on combined anaerobic-aerobic system and also to asses the possibility for applicating this technologyin textile dyeing industry. Textile wastewater that used in this research are azo dyes total concentration 200 mg/L which isconsist of remazol yellow, remazol red, remazol black and remazol blue For anaerobik condition step, by using bacteriaconsortium selected from sludge of textile wastewater plant of Mama & Leon consist of Aeromonas sp ML6., Aeromonassp. ML14, Aeromonas sp. ML24, Pseudomonas sp. ML8 and Flavobacterium Sp ML20 whereas aerobic condition step,using bacteria consortium selected from Badung river sludge consist of Vibrio sp. and Plesiomonas sp. Both bacteriaconsortium is immobilized separatively on volcanous stone for 3 days in each reactor before used to treatment of synteticdyeswater (SDW). Further more, immobilized bacteria consortiom on volcanous stone is determined by four plate countmethod.The result ot this research showed the eficiency process in decreasing color, TDS, TSS, COD and BOD was96,94%,75,73%, 68,03%, 97,68% dan 94,60% respectively. So, wastewater treatment by using combined anaerobicaerobicsystem is potential to applied on wastewater treatment in textile industry.