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PEMANFAATAN KULIT SINGKONG SEBAGAI BAHAN BAKU ARANG AKTIF DENGAN VARIASI KONSENTRASI NaOH DAN SUHU Ariyani, Ariyani; R., Putri A.; P., Eka R.; R., Fathoni
Konversi Vol 6, No 1 (2017): April 2017
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v6i1.2992

Abstract

Abstrak- Arang aktif dapat dibuat dari berbagai macam bahan baku salah satunya adalah kulit singkong karena kulit singkong memiliki kandungan karbon sebesar 59,31%. Salah satu pemanfaatan arang aktif adalah sebagai adsorben pada pemurnian air sungai. Arang aktif kulit singkong dibuat dengan proses karbonisasi pada suhu yaitu 300°C, 500°C, dan 700°C di dalam furnace. Arang aktif yang telah dikarbonisasi akan diaktifkan dengan variasi konsentrasi NaOH yaitu 0,1 N; 0,2 N; dan 0,3 N dengan waktu perendaman selama 24 jam. Kemudian dikontakkan dengan air sungai selama 30 menit dan dianalisa penyerapan logam Fe dan Mn pada air sungai. Dari penelitian ini dapat disimpulkan bahwa hasil terbaik untuk penyerapan logam Fe yaitu pada suhu 700°C dan konsentrasi NaOH 0,3 N didapatkan konsentrasi penyerapan sebesar 0 mg/mL (tidak terdeteksi), sedangkan untuk logam Mn pada suhu 300°C dan konsentrasi NaOH 0,3 N didapatkan konsentrasi penyerapan sebesar 0,213 mg/mL. Kata kunci: arang aktif, kulit singkong, Fe, Mn                                                         Abstract- Active charcoal can be made from a variety of raw materials, one of which is the cassava skin because the skin has a carbon content of cassava 59,31%. One of the utilization of active charcoal is as adsorbents on purification of river water. Active charcoal cassava peels are made with the process of carbonization temperature 300ºC, 500ºC, and 700ºC in the furnace. Active charcoal that has been in the carbonization is enabeld NaOH concentrations variations 0,1 N; 0,2 N; and 0,3 N with a time of immersion for 24 hours. Then in contact with river water right for 30 minutes and analyzed metal absorption of Fe and Mn in the river water. This research it can be concluded that the best results for the absorption of metals Fe, namely at a temperature 700ºC and rhe concentration of NaOH 0,3 N obtained concentration absorption of 0 mg/mL (not detected), while for metal Mn at temperatures of 300ºC and the concentration of NaOH 0,3 N obtained concentration absorption of 0,213 mg/mL.   Keywords: active charcoal, cassava peels, Fe, Mn
UKURAN DEWAN KOMISARIS DAN PROPORSI DEWAN KOMISARIS INDEPENDEN SEBAGAI DETRMINAN MANAJEMEN LABA Ariyani, Ariyani; Harianto, Rudi; Sari, Putri Zanufa
Media Mahardhika Vol 17 No 1 (2018): September 2018
Publisher : STIE Mahardhika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29062/mahardika.v17i1.69

Abstract

This study has the aim to obtain empirical evidence about the size of the board of commissioners and the proportion of independent board of directors as a determinant of earnings management. Data analysis techniques used in this study using software assistance in the form of Eviews, data collection used is by purposive sampling method on the food and beverages industry on the Indonesia Stock Exchange with the 2013-2017 study period. Based on the discussion of the results study can be proved that the size of the board have an influence on earnings management and the proportion of independent commissioners has an influence on earnings management.