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All Journal VALENSI Jurnal Tadris Kimiya Jurnal Riset Pendidikan Kimia (JRPK) Jurnal Riset Sains dan Kimia Terapan Chemistry and Materials

Tritiyatma Hadinugrahaningsih

Program Studi Pendidikan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun 13220, Jakarta, Indonesia

Author-ID : 3728249

Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology

Published : 16 Documents Claim Missing Document

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The Effect of Tertiary Butylhydroquinone Antioxidant on The Stability of Rubber Seed Biodiesel Salma Fitri Annisa; Zulmanelis Darwis; Tritiyatma Hadinugrahaningsih
Chemistry and Materials Vol. 1 No. 2 (2022)
Publisher : Pusat Inovasi Sains

This study aims to determine the effect of the addition of tertiary butylhydroquinone (TBHQ) antioxidants on the quality of biodiesel. Rubber seed biodiesel is synthesized through esterification and transesterification reactions, then biodiesel is characterized by different stages of adding TBHQ antioxidants before the esterification reaction and after the transesterification reaction. The usage of TBHQ antioxidants at the various stages of adding the process greatly affects the quality of biodiesel. The results showed that the addition of TBHQ 1000 ppm after transesterification was the most effective in slowing oxidative degradation by showing the lowest characteristics (acid number 0.64 mg KOH/g and peroxide value 33.91 meq O2/kg) for 3 weeks. All rubber seed biodiesel samples had kinematic density and viscosity according to the Indonesian National Standard (SNI) for 3 weeks except for the acid number only lasted 0 weeks.

PENGEMBANGAN KETERAMPILAN ABAD 21 DALAM PEMBELAJARAN ASAM BASA MELALUI PROYEK STEAM Achmad Ridwan; Chintia Fatimah; Tritiyatma Hadinugrahaningsih; Yuli Rahmawati; Alin Mardiah
Jurnal Tadris Kimiya Vol 7, No 1 (2022)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v7i1.4913

This study is aimed to develop students' 21st century skills by integrating STEAM projects (Science, Technology, Engineering, Art, and Mathematics) in learning chemistry on acid and base solutions. Interdisciplinary learning was designed to allow students to be actively involved in learning through project development activities to see the relevance of learning content and its application in real life. This study involved 35 students of natural science 11th grade, consisting of 14 boys and 21 girls, in one of public senior high schools in DKI Jakarta Province. Researchers used qualitative methods to understand students' experiences and the implications of learning on their 21st century skills. The researcher collected data through semi-structured interviews, observation, journal reflective, and 21st century skills questionnaires. The results showed that each stage of STEAM learning integrated with project-based learning encouraged students to develop 21st century skills, namely learning and innovation skills, skills using information, media, technology, and life and career skills. Students reflected their abilities in using information and technology, the ability to work together, communication, and thinking at higher levels, as well as adaptability and leadership. In addition, Students were also faced with challenges in changing the paradigm of teachers and students and managing the learning process.

PENENTUAN NITRIT DALAM IKAN BAWAL PUTIH (Pampus argenteus) MENGGUNAKAN REAGEN 3-AMINA-7-DIMETILAMINA-2-METILFENAZIN HIDROKLORIDA DENGAN SPEKTROFOTOMETER VISIBEL Tritiyatma Hadinugrahaningsih; Irma Ratna Kartika; Susy Saadah
Jurnal Riset Sains dan Kimia Terapan Vol 2 No 2 (2012): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 2 Nomor 2 Desember 2012
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Penelitian ini bertujuan untuk menentukan kadar nitrit dalam ikan bawal putih (Pampus argenteus) dengan variasi waktu penyimpanan menggunakan reagen 3-amina-7-dimetilamina-2-metilfenazin hidroklorida. Sampel ikan bawal putih (Pamppus argenteus) diperoleh dari hasil tangkapan nelayan Muara Angke. Kadar nitrit dalam ikan bawal putih (Pampus argenteus) ditentukan menggunakan metode spektrofotometri. Dari hasil penelitian, diketahui bahwa, konsentrasi optimum reagen 3-amina-7-dimetilamina-2-metilfenazin hidroklorida adalah 0,0021% (b/v). Kadar nitrit dalam daging ikan bawal putih (Pampus argenteus) melalui proses freeze dry saat didiamkan selama satu hari adalah sebesar 5,388ppm, sedangkan tanpa melalui freeze dry adalah sebesar 4,085ppm. Kadar nitrit dalam daging ikan bawal putih (Pampus argenteus) melalui proses freeze dry saat didiamkan selama empat belas hari adalah sebesar 28,89ppm, sedangkan tanpa melalui freeze dry adalah sebesar 18,53ppm. Semakin lama ikan bawal putih (Pampus argenteus) didiamkan, maka konsentrasi nitrit yang terkandung semakin meningkat. Tidak terdapat perbedaan antara konsentrasi nitrit dalam daging ikan bawal (Pampus argenteus) yang mengalami proses freeze dry dan tidak mengalami proses freeze dry. Kata kunci: Nitrit, ikan bawal putih, Pampus argenteus, 3-amina-7-dimetilamina-2-metilfenazin hidroklorida, freeze dry The aim of the research is to determine nitrite level in the silver pomfret (pampusargenteus) with various storage using 3-amino-7-dimethylamino-2-methyl phenazine hydrochloridereagent. The fresh fish purchase from MuaraAngke fisherman. Nitrite level of silver pomfret is determined by spectrophotometer method. The results showed that the optimum concentration of 3-amino-7-dimethylamino-2-methyl phenazine hydrochloride reagent is 0.0021% (b/v). The fish was stored using overnight freezedrying process. The nitrite level of overnight fish is 5.388ppm and without freeze drying process is 4,085ppm. The nitrite level of fish on day 14 is 28.89ppm, and without freezedrying process is 18.53ppm. The storage time of fish is linearly proportinonal to nitrite level which is using or without using freeze drying process. Key words: Nitrite, Pampusargenteus, 3-amine-7-dimethylamine-2-methylphenazine hydrochloride, freezedry

EKSTRAKSI EMAS DARI LIMBAH PAPAN SIRKUIT TELEPON GENGGAM MENGGUNAKAN TEKNIK MEMBRAN CAIR EMULSI Imam Santoso; Tritiyatma .H N; ana Titian
Jurnal Riset Sains dan Kimia Terapan Vol 1 No 2 (2011): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 1 Nomor 2 Desember 2011
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Penelitian ini bertujuan untuk menentukan persen ekstraksi emas dari limbah papan sirkuit telepon genggam dengan teknik membran cair emulsi menggunakan MIBK sebagai carrier. Reaksinya terjadi secara simultan di permukaan membran, antara senyawa yang akan dipisahkan pada fasa umpan dengan senyawa pembawa pada fasa organik. Logam emas hasil reaksi akan terdifusi ke fasa membran yang pada akhirnya hasil ekstraksi terkumpul dan terkonsentrasi di fasa penerima. Sebelum diaplikasikan ke limbah telepon , terlebih dahulu dipelajari beberapa parameter yang berpengaruh terhadap perolehan persen ekstraksi. Pada penelitian ini kondisi optimum untuk parameter pembuatan fasa emulsi yaitu 1:1, pengaruh kecepatan pembuatan emulsi pada yaitu 1000 rpm. Pengaruh konsentrasi carrier terhadap persen ekstraksi emas dengan konsentrasi MIBK sebesar 3%, pengaruh kecepatan kontak terhadap persen ekstraksi emas adalah pada 1000 rpm. Penerapan kondisi optimum pada limbah papan sirkuit telepon genggam memberikan persen ekstraksi Au sebesar83,24%. Kata kunci: limbah papan sirkuit telepon genggam, MIBK, teknik membran cair emulsi.

PENENTUAN FAKTOR SELEKTIFITAS PENISILIN G TERHADAP FENILASETAT SECARA EKSTRAKSI MEMBRAN CAIR EMULSI DENGAN MENGGUNAKAN CARRIER DIOKTILAMIN Imam Santoso; Tritiyatma Hadinugraha Ningsih
Jurnal Riset Sains dan Kimia Terapan Vol 1 No 1 (2011): JRSKT - Jurnal Riset Sains dan Kimia Terapan, Volume 1 Nomor 1 Juni 2011
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Tujuan dpenelitian ini adalah untuk menentukan faktor selektifitas pemisahan penisilin G dari fenilasetat. Cara penenlitian: ke dalam wadah yaitu reaktor (wadah tempat kontak antara fasa emulsi dengan fasa eksternal) dimasukkan 20 mL fasa eksternal buffer sitrat pH = 5 yang mengandung 372,5 ppm penisilin G dan 136,5 ppm fenilasetat. Emulsi yang stabil dicampurkan ke dalam reaktor tersebut diaduk dengan kecepatan 300 rpm dan waktu kontak 5 menit. Setelah terjadi kontak antara fasa emulsi dengan fasa eksternal campuran didiamkan kemudian dipisahkan lalu diambil fasa emulsinya. Emulsi dipecahkan fasa internal yang mengandung penisilin G ditentukan kuantitasnya dengan HPLC, Hasil penelitian memberikan data sebagai berikut : persen ekstraksi penislin G pada lama ekstraksi : 5 menit, 10 menit, 15 menit, 20 menit adalah : 35,74% ; % ; 10,54% ; 10,05 % ; 9,66% lebih tinggi dibanding persen ekstraksi fenil asetat 15,13% ; 0,76% ; 0,57% ; 0,55%. Akibatnya faktor selektifitas penisilin G-fenilasetat naik dari 2,1 sampai 21. Keadaan ini memberikan arti bahwa pada fasa internal kandungan penisilin G lebih banyak dibanding fenilasetat. Dengan demikian kesimpulan penelitian adalah cara ekstraksi membran cair emulsi dengan dioktilamin sebagai carrier merupakan cara yang efektif untuk memisahkan campuran penisilin G dari fenilasetat.Kata kunci : Membran cair emulsi, faktor daya pisah

Effect of Mass and Contact Time of Coffee Grounds in Nickel Metal Ion Adsorption on Liquid Waste of Chemistry Laboratory Trinanda, Inez; Yussi Pratiwi; Tritiyatma Hadinugrahaningsih
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.86

Based on Indonesian Government Regulation PP No. 22 of 2021 concerning the implementation of environmental protection and management, the quality standard for nickel in waters is 0.05 mg/L. Nickel waste is very harmful to aquatic and terrestrial ecosystems and poses risks to human health. In this study, nickel waste was treated with coffee grounds using the adsorption method. The purpose of this study was to determine the effect of variations in the mass of coffee grounds and contact time on the adsorption of nickel metal in the liquid waste generated by the UNJ Chemistry laboratory. Coffee grounds are activated with NaOH 0.01 M to increase their adsorption ability. Two tests were conducted, namely, the variation of adsorbent mass and the variation of contact time. Based on the results of testing the variation of adsorbent mass and contact time, the highest percentage of removal was obtained at 91.70% at a mass of 0.05 g with a contact time of 15 minutes. The lowest percentage of removal was 39.56% in a mass of 1.5 g with a contact time of 90 minutes. This research provides a novel approach to heavy metal waste treatment especially nickel metal ion, which can be adapted to enhance waste treatment technologies in the future.

Co-Authors Achmad Ridwan Achmad Ridwan Ade Mutia Alin Mardiah ana Titian Belgys Zahia Bestiana Desti Chintia Fatimah DIAN LESTARI Evi Elfrida Firza Luthfia Adlina I Gusti Ayu R.N. A Imam Santoso Imam Santoso Imam Santoso Irma Ratna Kartika Irna Ratna Kartika Mentari Reza Apriliana Nurbaity Nurbaity Rizka Amalia Rahmawati Salma Fitri Annisa Setia Budi Silvana Tatian Sukro Muhab Susy Saadah Trinanda, Inez Yuli Rahmawati Yusmaniar Yussi Pratiwi Zulmanelis Darwis

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