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All Journal Jurnal Riset Kimia Gadjah Mada Journal of Psychology
- Frengky
Laboratorium Elektro/Fotokimia, Jurusan Kimia, FMIPA, Universitas Andalas Padang
Chemistry

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UJI SELEKTIFITAS TRANSPOR Cu(II) TERHADAP Mg(II), Ca(II) DAN Sr(II) DENGAN ZAT PEMBAWA OKSIN DAN SDS SEBAGAI ADITIF MELALUI TEKNIK MEMBRAN CAIR FASA RUAH Tetra, Olly Norita; Kahar, Zaharasmi; Alif, Admin; Frengky, -
Jurnal Riset Kimia Vol 5, No 2 (2012): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v5i2.215

Abstract

Selectivity of Cu(II) transport from the source phase containing Mg(II), Ca(II) and Sr(II) into the receiver phase had been researched by using oxine as carrier and Sodium Dodecyl Sulfate (SDS) as additive through bulk liquid membrane.The efficiency of the method depends on parameter (the pH of the donor and acceptor phase, effect of carrier concentrations, and time of transport). The selectivity of the method was assessed by performing the single, as well as the competitive transport experiment of Mg(II), Ca(II,) and Sr(II) ion and then Cu(II) percentage which was transported to receiver phase 99.98% and residue in source phase do not detect. The measurement was done to both of source phase and receiver phase by using Atomic Absorption Spectrophotometer (213.9 nm).
Model Pembelajaran Matematika Siswa Kelas Satu Sekolah Dasar Frengky, -
Jurnal Psikologi Vol 35, No 2 (2008)
Publisher : Faculty of Psychology, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.187 KB) | DOI: 10.22146/jpsi.7949

Abstract

Optimizing school quality depends on the comprehension to teaching‐learning processes in the classroom as well as outside classroom. Quality school shows high capacity in optimizing students’ ability in certain courses such as in mathematics. The teaching‐learning processes of Mathematics, well‐known as a difficult course among students, needs more attention. This study focused on the observation of the teaching learning processes in Mathematics among first grade students of yunior high‐school. The study used a qualitative approach with a grounded theory. Participants were recruited from a yunior high‐school in Yogyakarta. The results showed that students were interested in studying mathematics and consistent guidances were needed in teaching mathematics for students.
Co-Authors Admin Alif Olly Norita Tetra Zaharasmi Kahar