4 research outputs found
Penyisihan Ion Kalsium Menggunakan Karbon Limbah Sekam Padi Dengan Aktivasi Naoh
No full textSekam padi dimanfaatkan menjadi karbon aktif tujuan yaitu untuk mengetahui pengaruh
konsentrasi aktivator NaOH pada penyisihan ion dimana untuk mengetahui perbandingan
karakteristik seperti diameter pori, volume pori dan luas permukaan pori dari adsorben serta
persentase penyisihan ion kalsium yang dihasilkan. Pengujian dalam penelitian ini dilakukan
uji SNI 06-3730-1995, XRF, FT-IR, BET, adsorpsi dan Titrasi Kompleksometri, massa
adsorben 0,5 gram; 1 gram; 1,5 gram; 2 gram; 2,5 gram dan 3 gram. Hasil pengujian dalam
penelitian ini yaitu SNI 06-3730-1995 karbon sekam padi diperoleh kadar air 5,53%; kadar abu
9,33%; kadar volatil 23,58% dan karbon murni 67,08%, sedangkan karbon aktif sekam padi
diperoleh kadar air 4,70%; kadar abu 9,25%; kadar volatil 23,52% dan karbon murni 67,23%,
Pada karbon sekam padi diameter pori 0,716848 nm, volume pori 0,01650 cm3/gr luas
permukaan 83,4998 m2/gr, sedangkan karbon aktif sekam padi diameter pori 1,93313 nm,
volume pori 0,07330 cm3/gr luas permukaan 186,642 m2/gr. Persentase penyisihan ion kalsium
pada karbon limbah sekam padi sebelum aktivasi dengan NaOH ada berada massa adsorben
2,5 gram di menit ke-60 sebesar 63,8% sedangkan pada karbon limbah sekam padi setelah
aktivasi dengan NaOH ada di massa adsorben 3 gram dengan menit ke-5 sebesar 70,3%
Penyisihan Ion Kalsium Menggunakan Karbon Limbah Sekam Padi Dengan Aktivasi Naoh
No full textSekam padi dimanfaatkan menjadi karbon aktif tujuan yaitu untuk mengetahui pengaruh
konsentrasi aktivator NaOH pada penyisihan ion dimana untuk mengetahui perbandingan
karakteristik seperti diameter pori, volume pori dan luas permukaan pori dari adsorben serta
persentase penyisihan ion kalsium yang dihasilkan. Pengujian dalam penelitian ini dilakukan
uji SNI 06-3730-1995, XRF, FT-IR, BET, adsorpsi dan Titrasi Kompleksometri, massa
adsorben 0,5 gram; 1 gram; 1,5 gram; 2 gram; 2,5 gram dan 3 gram. Hasil pengujian dalam
penelitian ini yaitu SNI 06-3730-1995 karbon sekam padi diperoleh kadar air 5,53%; kadar abu
9,33%; kadar volatil 23,58% dan karbon murni 67,08%, sedangkan karbon aktif sekam padi
diperoleh kadar air 4,70%; kadar abu 9,25%; kadar volatil 23,52% dan karbon murni 67,23%,
Pada karbon sekam padi diameter pori 0,716848 nm, volume pori 0,01650 cm3/gr luas
permukaan 83,4998 m2/gr, sedangkan karbon aktif sekam padi diameter pori 1,93313 nm,
volume pori 0,07330 cm3/gr luas permukaan 186,642 m2/gr. Persentase penyisihan ion kalsium
pada karbon limbah sekam padi sebelum aktivasi dengan NaOH ada berada massa adsorben
2,5 gram di menit ke-60 sebesar 63,8% sedangkan pada karbon limbah sekam padi setelah
aktivasi dengan NaOH ada di massa adsorben 3 gram dengan menit ke-5 sebesar 70,3%
Impacts of anthropogenic SOx, NOx and NH3 on acidification of coastal waters and shipping lanes
No full textabsorbed from the atmosphere is now well-recognized and is considered to have lowered surface ocean pH by 0.1 since the mid-18th century. Future acidification may lead to undersaturation of CaCO3 making growth of calcifying organisms difficult. However, other anthropogenic gases also have the potential to alter ocean pH and CO2 chemistry, specifically SOx and NOx and NH3. We demonstrate using a simple chemical model that in coastal water regions with high atmospheric inputs of these gases, their pH reduction is almost completely canceled out by buffering reactions involving seawater HCO3- and CO32- ions. However, a consequence of this buffering is a significant decrease in the uptake of anthropogenic CO2 by the atmosphere in these areas
Impacts of atmospheric nutrient deposition on marine productivity: Roles of nitrogen, phosphorus, and iron
No full textNutrients are supplied to the mixed layer of the open ocean by either atmospheric deposition or mixing from deeper waters, and these nutrients drive nitrogen and carbon fixation. To evaluate the importance of atmospheric deposition, we estimate marine nitrogen and carbon fixation from present-day simulations of atmospheric deposition of nitrogen, phosphorus, and iron. These are compared with observed rates of marine nitrogen and carbon fixation. We find that Fe deposition is more important than P deposition in supporting N fixation. Estimated rates of atmospherically supported carbon fixation are considerably lower than rates of marine carbon fixation derived from remote sensing, indicating the subsidiary role atmospheric deposition plays in total C uptake by the oceans. Nonetheless, in high-nutrient, low-chlorophyll areas, the contribution of atmospheric deposition of Fe to the surface ocean could account for about 50% of C fixation. In marine areas typically thought to be N limited, potential C fixation supported by atmospheric deposition of N is only ~1%-2% of observed rates. Although these systems are N-limited, the amount of N supplied from below appears to be much larger than that deposited from above. Atmospheric deposition of Fe has the potential to augment atmospherically supported rates of C fixation in N-limited areas. In these areas, atmospheric Fe relieves the Fe limitation of diazotrophic organisms, thus contributing to the rate of N fixation. The most important uncertainties in understanding the relative importance of different atmospheric nutrients are poorly understood speciation and solubility of Fe as well as the N:Fe ratio of diazotrophic organisms
