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All Journal Jurnal Pendidikan dan Pembelajaran Alchemy : Journal of Chemistry
Dewi Annisa, Dewi
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Materials Science & Nanotechnology

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OPTIMASI METODE PENENTUAN KADAR LOGAM TEMBAGA DAN TIMBAL DALAM GULA PASIR SECARA SPEKTROFOTOMETRI SERAPAN ATOM DENGAN DESTRUKSI MICROWAVE DIGESTION Dewi, Diana Candra; Fauziyah, Begum; Suryadinata, Arief; Annisa, Dewi; Afifah, Nurul
ALCHEMY ALCHEMY (Vol.2 No.2
Publisher : Department of Chemistry, Faculty of Science and Technology UIN Maulana Malik Ibrahim Malan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (417.983 KB) | DOI: 10.18860/al.v0i0.2884

Abstract

Tembaga (Cu) dan Timbal (Pb) adalah bahan ikutan yang ditemukan dalam gula pasir. Penelitian ini  bertujuan mengetahui performa analitik kurva standar dengan penentuan suhu dan waktu terbaik destruksi menggunakan microwave digestion, serta performa analitik kurva adisi standar menggunakan suhu dan waktu terbaik destruksi.Penelitian  ini  meliputi penentuan performa  analitik  untuk kurva  standar yaitu linearitas, batas deteksi dan batas kuantitasi, sensitivitas, akurasi serta presisi untuk larutan standar Cu dan Pb, kemudian dilakukan pendestruksian sampel gula pasir dengan destruksi basah menggunakan microwave digestion dengan variasi suhu 160, 180 dan 200 oC dan variasi waktu 10, 15, 20 dan 30 menit dan waktu penyimpanan 1 sampai 5 hari. Penentuan  performa  analitik  juga ditentukan pada  kurva adisi standar untuk larutan Cu dan Pb yang telah ditambahkan sampel hasil destruksi.Hasil penelitian menunjukkan bahwa : Suhu dan waktu terbaik destruksi gula pasir menggunakan microwave digestion untuk analisis Cu yaitu suhu 200 oC dan waktu 15 menit serta waktu penyimpanan sampai 3 hari. Suhu dan waktu terbaik microwave digestion untuk menganalisa logam timbal (Pb) adalah 180 0C dan 10 menit serta waktu penyimpanan hanya sampai 1 hari. Performa  analitik  untuk kurva  standar  tembaga (Cu) meliputi r2 = 0,9993; LOD (Limit of Detection) 0,0011 ppm dan LOQ (Limit of Quantitation) 0,0036 ppm;  sensitivitas 0,2; rata-rata akurasi sebesar 99.96%; serta presisi 9,46%, sedangkan performa  analitik  untuk  kurva  adisi  standar  tembaga (Cu)  meliputi  r2 = 0,9999; LOD 0,0012 ppm dan LOQ 0,004 ppm; sensitivitas 0,1729, rata-rata akurasi sebesar 100,07% serta presisi 5,38%. Performasi analitik untuk kurva standar timbal (Pb) meliputi r2 = 0,9999; LOD 0,0019 ppm,  LOQ 0,0066 ppm; sensitivitas 0,1069 ppm ; rata-rata akurasi sebesar 99,56 % serta presisi 2,32 %. Performasi analitik kurva adisi standar timbal (Pb) meliputi r2 = 0,9999; LOD 0,0018 ppm, LOQ 0,0060 ppm; sensitivitas 0,1090 ppm; rata-rata akurasi sebesar 100,01 % serta presisi 1,94 %.
PEMANFAATAN BUKU TEKS SEBAGAI SUMBER BELAJAR MATA PELAJARAN SEJARAH DI SMA MUHAMMADIYAH 2 PONTIANAK Annisa, Dewi; Noor, Agus Sastrawan; Firmansyah, Andang
Jurnal Pendidikan dan Pembelajaran Khatulistiwa Vol 8, No 2 (2019): Februari 2019
Publisher : Jurnal Pendidikan dan Pembelajaran Khatulistiwa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (76.651 KB)

Abstract

AbstractThis research is aimed at finding out the implementation of teaching history subject including the utilization of related text-books as the learning source as well as the obstacle in utilizing the text-books as the learning source of the history subject to eleventh graders of SMA Muhammadiyah 2 Pontianak. This research uses qualitative method in form of descriptive research. The source of the data was from the informants as they are the representatives of the eleventh graders of social and science study as well as the history teachers. The related data was from the result of observation as well as interview and documentations. The research finding shows that the utilization of the text books as the learning source of history subject to the eleventh graders of SMA Muhammadiyah 2 Pontianak was passably good yet in the learning implementation the books are not spread evenly to all the students thus some of them have to share the books to their seatmates. The teacher in teaching learning process, use the books only when they are demanded as to support the learning and rather engage students in interactive discussion, while then the students themselves review it with their learning group or individually. The obstacle faced by the students in utilizing the text books as the learning source was that they do not really understand what is there in the history textbooks as so they have to search it in the internet. Keywords: Textbooks, Learning Source, History Subject, SMA Muhammadiyah 2 Pontianak.
Co-Authors Agus Sastrawan Noor Andang Firmansyah Arief Suryadinata Begum Fauziyah Diana Candra Dewi Muhammad Afif