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All Journal Jurnal Natur Indonesia Teknosains: Media Informasi Sains dan Teknologi SINEKTIKA: Jurnal Arsitektur Jurnal Kimia Mulawarman ARTEKS : Jurnal Teknik Arsitektur Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Akademika Kimia EPI International Journal of Engineering Abdi Dosen : Jurnal Pengabdian Pada Masyarakat JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Riset Pendidikan MIPA Mattawang: Jurnal Pengabdian Masyarakat Panrannuangku Jurnal Pengabdian Masyarakat Media Eksakta Jurnal Akademika Kimia Jurnal Akademika Kimia

Baharuddin Hamzah

Pendidikan Kimia University Of Tadulako

Author-ID : 273701

Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Health Professions Library & Information Science Materials Science & Nanotechnology Mathematics Physics Public Health Social Sciences Other

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Mapping of Reflective Thinking Levels and Basic Thinking Ability of Students on Learning Science at SMP Negeri 30 Sigi Delviana, Delviana; Hamzah, Baharuddin; Solfarina, Solfarina
Jurnal Riset Pendidikan MIPA Vol. 4 No. 1 (2020)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j25490192.2020.v4.i1.pp53-60

This study aims to map the reflective thinking level of students and to map students' basic thinking skills in science learning at SMP Negeri 30 Sigi. The method used in this research is the descriptive method. The test used is a set of tests containing UN questions for the last five years about science learning given to students with the aim of obtaining information about students' basic thinking levels while measuring reflective thinking skills using a questionnaire that has been validated by experts. Students of SMP N 30 Sigi have very low basic thinking skills. The highest correct answer is 21 questions and the lowest correct answer is 7 questions. A total of 42 students as a whole had a reflective thinking stage for habitual action, 29 of which were transitions between habitual action and understanding, 11 of which were transitioning to habitual action, understanding, and reflective, and only 2 of them reached the critical thinking stage. Students 'reflective thinking skills are directly proportional to students' basic thinking skills. The higher the students 'reflective thinking stages, the better the students' basic thinking skills.

PKM Musyawarah Guru Mata Pelajaran (MGMP) Kimia Kabupaten Donggala Dalam Penyusunan Dan Publikasi Karya Ilmiah Rahmawati, Sitti; Hamzah, Baharuddin
JATI EMAS (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat) Vol 4 No 2 (2020): Jati Emas (Jurnal Aplikasi Teknik dan Pengabdian Masyarakat)
Publisher : Dewan Pimpinan Daerah (DPD) Perkumpulan Dosen Indonesia Semesta (DIS) Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36339/je.v4i2.312

Partners of this service activity are Chemistry teachers who are members of the Donggala District Teacher Meeting (MGMP). The problems faced by the partner groups, including members of the Chemistry Subject Teacher Conference (MGMP), still experienced difficulties in: a) designing the implementation of CAR in the learning process (how to identify problems, select and formulate topics and titles for classroom action research, b) apply models learning and learning media in the implementation of CAR and how to collect data that is appropriate and efficient, c) scientific reading tracing techniques, especially in the form of journals to be used as a reference for writing (literature search), d) analyzing and interpreting data obtained during research, e) making instruments research, especially CAR and data presentation techniques, f) writing techniques and submitting article manuscripts to scientific journals and the lack of resource persons. The purpose of this PKM is to provide assistance and training for chemistry teachers, especially those who are members of the Donggala District Chemistry MGMP in preparing research reports and articles that meet the requirements for publication in scientific journals, preceded by training in processing and analyzing research data.. The method used in this PKM activity is conducting training and workshops on the implementation of CAR, making research instruments, processing and analyzing research data. Furthermore, they will assist partners in preparing the PTK report and its publication and can process the PTK research data into the form of scientific paper articles and published in ISSN journals or at national level scientific seminars. The implementation of workshops and training on the preparation and publication of scientific papers is very beneficial for the Chemistry MGMP of Donggala Regency which has had difficulty meeting the requirements for promotion in the field of writing scientific papers. In the application of the practice of writing articles, three members of the Chemistry MGMP of Donggala Regency, have made classroom action research reports, processed data and wrote in scientific articles, and temporarily reviewed them for publication in interactive journals.

Penerapan Metode Pembelajaran SQ3R Berbantuan Internet Terhadap Hasil Belajar Siswa Kelas X Pada Materi Sistem Periodik Unsur Di SMA Labschool Palu Alep, Boni; Walanda, Daud K.; Hamzah, Baharuddin
Jurnal Akademika Kimia Vol 4, No 1 (2015)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.35 KB)

Internet is a global network connecting thousands and even millions of computer networks with a personal computer so that the user can obtain a variety of information from wider sources. This internet service is used to assist the implementation of the SQ3R learning method that is expected to enrich the literature. The SQ3R learning method is a method of learning which uses the reading technique intensively and rationally to understand the main ideas, the details of a reading, and a comprehensive understanding of a passage with the steps i.e. surveying, asking, reading, communicating, and reviewing. The aim of this study was to determine the effect of the implementation of SQ3R learning method internet-assisted to the learning outcomes (cognitive) of students in the class X on the material periodic table of elements at Senior High School Labschool Palu. This research was a quasi-experimental with non-randomized pre-test and post-test control groups design. This research was carried out by holding two groups of class X science 1 as the control group (n = 19) and Class X science 2 as the experimental group (n = 18).Testing of research data used t-test statistical analysis one side (right side) with the prerequisite tests: normality and homogeneity tests. The results of the data analysis obtained the average value (X1 ) of experiment class was 83.94 with a standard deviation of 8.24 and (X1 ) of control class was 77.78 with a standard deviation of 8.54. Results of the hypothesis testing using statistical t-test one side (right side) obtained tcount>ttable value was 1.867 > 1.690 with a confidence level (Î±) = 0.05 and a degree of freedom (df ) = 35. Based on the results of hypothesis testing, then Ho is rejected and H1 is accepted so it can be concluded that the SQ3R learning method internet-assisted on the material Periodic System of Elements has a positive influence on the learning outcomes of students in the class X at Senior High School Labschool Palu.

Pengaruh Tembaga(II) dan Kadmium(II) Terhadap Persen Ekstraksi Merkuri(II) Menggunakan Emulsi Membran Cair Tipe W/O Bersurfaktan Ganda dengan Benzoil Aseton Sebagai Pembawa Kation Baharuddin Hamzah; HUsnia Mucthar; Sitti Rahmawati
JURNAL KIMIA MULAWARMAN Vol 15 No 1 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v15i1.493

Telah dilakukan penelitian tentang pengaruh tembaga(II) dan kadmium(II) terhadap persen ekstraksi merkuri(II) menggunakan emulsi membran cair tipe W/O bersurfaktan ganda dengan benzoil aseton sebagai pembawa kation. Kondisi optimum yang digunakan pada penelitian ini adalah sebagai berikut. Emulsi dibuat dengan menggunakan campuran surfaktan span-80 & span-20 = 2%, laju emulsifikasi = 2000 rpm selama 10 menit, rasio volume fasa membran/fasa internal = 1, konsentrasi HNO3 dalam fasa internal = 2M. Ekstraksi dilakukan terhadap larutan 30 ppm merkuri sebagai fasa eksternal dengan pH = 2 dan laju ekstraksi 300 rpm selama 10 menit serta rasio volume fasa eksternal/emulsi = 7, Hasil penelitian menunjukkan bahwa ekstraksi merkuri(II) dengan emulsi membran cair, relatif selektif terhadap tembaga(II) dan kadmium(II). Hasil penelitian juga menunjukkan bahwa keberadaan tembaga(II) dan kadmium(II) hingga 30 ppm, menurunkan persen ekstraksi merkuri(II) berturut-turut 12,12% dan 11,74%.

Analysis of Calcium (Ca) and Potassium (K) Levels in Mackerel (Rastrelliger sp.) Bones Ni Luh A. Murtini; Baharuddin Hamzah
Jurnal Akademika Kimia Vol. 9 No. 3 (2020)
Publisher : Universitas Tadulako

Mackerel (Rastrelliger sp.) is one of the potential pelagic fish in Indonesia and in almost all Indonesian waters. In general, fish bones contain many essential ingredients for the body and can be processed into fish bone flour. This study aimed to determine calcium (Ca) and potassium (K) levels in mackerel (Rastrelliger sp.) bones. Calcium and potassium levels were determined using an atomic absorption spectrophotometry (AAS). Results of the analysis showed that the water, ash, and biomass levels of the sample were 10.53, 18.26, and 71.21%, respectively. Analysis of calcium and potassium levels at wavelengths 422.7 nm and 766.5 nm obtained an average of 508.15 and 36.37 mg/100g. The results indicate that the calcium level is higher than the potassium level in mackerel (Rastrelliger sp.) bones.

Determination of Total Flavonoid Contents and Antioxidant Activity of Leucaena Leucocephala Leaves's Extract Taupik Hidayat; Baharuddin Hamzah; Minarni R. Jura
Jurnal Akademika Kimia Vol. 9 No. 2 (2020)
Publisher : Universitas Tadulako

The study of the determination of total flavonoid contents and antioxidant activity of extract of Leucaena leucocephala leaves had been carried out using UV-Vis spectrophotometry method. This study aimed to determine the total flavonoid contents and the antioxidant power of Leucaena leucocephala extract. Extraction of chemical content from Leucaena leucocephala was carried out by the maceration method using absolute ethanol. The total flavonoid contents from the sample extract were taken up for absorption at wavelength 510 nm and 700 nm. The variation of the concentration of Leucaena leucocephala leaves' extract was respectively 20, 40, 60, and 80 ppm. The results of the study showed that the total flavonoid contents of extracts of Leucaena leucocephala leaves was 2.242 g/100 grams. The antioxidant activity of Leucaena leucocephala leaves extract was carried out using DPPH (1,1-diphenyl-2-picrylhydrazine) and the measurement of absorption was at a wavelength of 517 nm, and by varying the sample concentration. Positive control used was vitamin C solution with the same variation of extract's concentration. The results showed that the IC50 values of Leucaena leucocephala leaves extract and vitamin C were 175.388 and 28.907 ppm. Based on the IC50 data it can be stated that the antioxidant vitamin C was stronger than the Leucaena leucocephala leaves extract which was classified as a weak type of natural antioxidant.

The Effect of Copper(II) and Cadmium(II) Ions Against the Percent Mercury Ion Extraction Using Emulsion Liquid Membrane Technique Suhartini Musa; Baharuddin Hamzah; Daud K. Walanda
Jurnal Akademika Kimia Vol. 8 No. 4 (2019)
Publisher : Universitas Tadulako

The effect of copper(II) and cadmium(II) ions on the percent of mercury ion extraction using an emulsion liquid membrane technique have been performed. This study used HNO3 as an internal phase, mixed span 80 and span 20 as a surfactant, benzoyl acetone as cation carrier, kerosene as membrane phase, and mercury solution as a sample solution. Variations of concentrations of copper(II) and cadmium(II) ions added were 10, 20, and 30 ppm with mercury concentrations of 30 ppm. The result of the research showed that the addition of copper(II) ion with concentrations of 10 to 30 ppm decreased the percentage of mercury ion extraction 30 ppm by 12.12% and the addition of cadmium(II) ion with the concentration of 10 to 30 ppm decreased the percentage of mercury ion extraction 30 ppm by 11.74%.

Emulsion Stability Tes and Effect of HNO3 Concentration in the Internal Phase on Cadmium Ion Extraction using Liquid Membrane Emulsion Technique Sahida Sahida; Baharuddin Hamzah; Siti Nuryanti
Jurnal Akademika Kimia Vol. 9 No. 1 (2020)
Publisher : Universitas Tadulako

Study on the emulsion stability and cadmium ion extraction tests was performed using the liquid membrane emulsion technique. This study aimed to determine the emulsion stability between the membrane phase and the internal phase with the variation of the ratio (2:1, 1:1, 2:3, and 1:2), and to determine the maximum conditions of cadmium ion extraction in a solution including the various concentration of HNO3 solution 1, 1.5, 2, and 2.5 M. This study is a laboratory experimental method using benzoyl acetone compound as cation carrier, kerosene as membrane phase, HNO3 solution as the internal phase, span-20 and span-80 as surfactants, and cadmium solution as the sample solution. Cadmium ion concentration in the external phase was determined by UV-VIS spectrophotometer. The result showed that the emulsion stability test which produced the most stable emulsion was in the ratio of the membrane phase and the internal phase 1:1. In addition, the concentration of the HN03 solution resulted in a maximum extraction percentage of 1.5 M with an extraction percentage was 95.28%.

Analysis of Cyanide Contents in Cassava Leaves (Manihot esculenta Crantz) Based on Boiling Time with Formation of Hydrindantin Complex by Using UV-Vis Spectrophotometry Kadek N. Anjani; Baharuddin Hamzah; Paulus H. Abram
Jurnal Akademika Kimia Vol. 10 No. 1 (2021)
Publisher : Universitas Tadulako

This study aimed to determine cyanide contents in cassava leaves (Manihot esculenta Crantz) based on boiling time with the formation of hydrindantin complex using UV-Vis spectrophotometry. The variation of boiling time was 0, 5, 10, and 15 minutes respectively. The cyanide content was prepared by extracting the sample using water for 2 hours. Then the sample was distilled to obtain a distillate that containing cyanide. Determination of cyanide was carried out by reacting samples containing cyanide with 1% ninhydrin and 0.5% Na2CO3, then adding 1 M NaOH to form blue hydrindantin compounds in an alkaline condition. Blue hydrindantin compounds formed were analyzed by spectrophotometry at a maximum wavelength of 590 nm. The results showed that cyanide contents in cassava leaves based on boiling time 0, 5, 10, and 15 minutes respectively were 20.73 ppm, 13.92 ppm, 9.18 ppm, and 3.38 ppm. The longer the cassava leaves were boiled, the better it was to be consumed because it will significantly reduce cyanide contents.

Variasi Perbandingan Volume Fasa Membran Dan Fasa Internal Serta Konsentrasi HNO3 Dalam Fasa Internal Terhadap Ekstraksi Ion Timbal(II) Menggunakan Teknik Emulsi Membran Cair Baharuddin Hamzah; Widya Astuti; Suherman Suherman; Siti Rabiah Laonu
Jurnal Akademika Kimia Vol 4, No 2 (2015)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (438.729 KB)

The research about variation of volume ratio of membrane/internal phase and concentration of HNO3 in internal phase on lead(II) extraction by liquid membrane emulsion technique. Volume ratios of the membrane and the internal phases used were 2:1, 2:2, 2:3 and 2:4 while the HNO3 concentrations used were 1M, 2M, 3M and 4M. The chemical used in this extraction was benzoylacetone as chelating agents. The determination of extraction was performed by spectrodirect spectrophotometer. The results showed the largest extraction percentage on the extraction of the ion lead(II) in solution by using emulsion liquid membrane was obtained in the volume ratio of the membrane and the internal phases of 2:3 with HNO3 concentration in the internal phase of 3M. these numbers can extract the ion lead(II) as much as 238 ppm in 180 mL with the extraction percentage of 84.45.

Co-Authors Abdul Wahid Wahab Afadil Agustin Tiwow Alep, Boni Alizah, Nur Amin, Alif Hidayatullah Anak Agung Istri Sri Wiadnyani Asisa, Nur Azzajjad, Muhammad Fath Baloga, Hendra Bayu Riyadi, Bayu Cica Anisa Daud Karel Walanda Delviana, Delviana Dia Afrianti Sangkota, Vivi Diharnaini Diharnaini Djahir, Ahmad Rifaldi Djasman, Syamsiar Masgul Fadlian, Fadlian Fiskanita, Fiskanita Fitriani, Eva Frantauansyah, Frantauansyah Genefefa T., Fulgensia Hardani, Muhammad F. Hardani, Muhammad Fakhrul HUsnia Mucthar Husnia, Husnia I Gusti Ngurah Antaryama Iffatunniswah Suhud Ihsan Ihsan Irawati, Dwi Ardi Irwan Irwan Irwan Said Jamaludin M Sakung Kadek N. Anjani Laksono Trisnantoro Linawati Linawati Luh Putu Ratna Sundari Magfirah Mangela, Yessika D. Minarni Rama Jura Moh. Yusuf, Moh. Muhammad Awaluddin Hamdy Mustapa, Kasmuddin Nasution, Annio Indah Lestari Ni Luh A. Murtini Noor Jalaluddin Nurdin Rahman Nurhayati Kamaruddin Nurul Jamala Pathuddin Paulus H. Abram Paulus Hengky Abram Poppy Fitra Wahyuni Pulukadang, Sri H. V. Purnama Ningsih Putri, Eska Perdanawati Kahar Rahmawati, Rahmawati Rawal, Andi Resky Reny, Reny Reny, Reny Rezki Rezki Ria Wikantari Ririen Hardani Rosady Mulyadi S, Afadil Sahabuddin Latif, Sahabuddin Sahida Sahida Salsabila, Unik Hanifah Sangkota, Vivi Diah Siti Nurbaya Siti Nuryanti Siti Rabiah Laonu Sitti Aminah Sitti Rahmawati Solfarina, Solfarina Sri Hastuti Virgianti Pulukadang Suhartini Musa Suherman Suherman Sulniawati, Sulniawati Supriyatno, Tri Octivan Suwiyarsa, I Nyoman Tamala, Sindy T. Taupik Hidayat Tiwow, Vanny Maria Agustina Tri Suci Lestari Tudjuka, Mora Delfita Tuljannah, Naima Widya Astuti

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