JURNAL KIMIA MULAWARMAN
Not a member yet
227 research outputs found
Sort by
PEMANFAATAN TANAMAN PETUNIA UNGU (Ruellia simplex C.) SEBAGAI PENYERAP LOGAM TIMBAL (Pb) PADA MEDIA TUMBUH TANAH
No full textHas been done a research concerning the use of Petunia Ungu (Ruellia simplex C.) plants as an absorbent lead metal (Pb) in the soil growing medium. The research almed to determine the levels of lead metal in petunia ungu plants and determine the effect of variations of concentrations also to determine the effect of absorption time in plants during planting petunia ungu 1, 2, 3 and 4 weeks then petunia ungu planted in the soil as the growing that was added a solutions of lead respectively 0, 25, 50, 75 and 100 mg/L. A soil sample preparation was conducted by wet digestion method and petunia ungu plants by dry digestion method. Metal levels of lead in the soil samples and petunia ungu plants was measured by atomic absorption spectrophotometer at wavelengths of 283,3 nm. The result of research showed that petunia ungu plants can absorb lead metal, the average levels of lead metal in petunia ungu plants consist of 0 ppm 1, 2, 3 and weeks 1,2303; 1,3190; 1,5064 and 1,6915 mg/Kg. 25 ppm 2,1779; 3,0426; 3,4145 and 3,3643 mg/Kg. 50 ppm 3,1317; 3,4316; 3,8689 and 4,2841 mg/Kg. 75 ppm 3,1179; 4,6695; 6,5676 and 6,6828 mg/Kg. 100 ppm 2,5205; 3,6302; 5,4442 and 6,9167 mg/Kg. beside that a lead metal content in the soil as a growing medium decreased
DISTRIBUSI LOGAM TIMBAL (Pb) PADA TANAMAN WEDELIA (Wedelia trilobata (L.) Hitch) AKIBAT EMISI KENDARAAN BERMOTOR DI BEBERAPA JALAN KOTA SAMARINDA
No full textThe research has done of "The distribution of lead (Pb) on wedelia plants contaminated by vehicular emission on several main road in samarinda”. This study aimed to determine the metal concentrations of lead in roots, flowers and leaves of plants wedelia at several locations in the city of Samarinda on PM Noor Street, Wahid Hasyim Street, Pahlawan Street, AW Syahrani Street, and Belatuk Street (control location) were the different traffic density and the treatment of leaching on levels of lead found in wedelia plants. The concentrations of lead metal on wedelia plants were measured using an Atomic Absorption Spectrophotometer (AAS) at a wavelength of 283.3 nm. The results showed that The highest levels of Pb obtained on PM Noor and lowest on Belatuk, were the traffic density is high concentration of lead is absorbed more than low traffic density. And the treatment of non-leaching and leaching concentrations obtained difference was not significant, indicating leaching did not significantly affect the concentration of Pb on plants
STUDI KOMPUTASI REAKSI ADSORBSI DISOSIASI GAS O2 PADA PERMUKAAN Pt-Fe DENGAN METODE TEORI FUNGSI KERAPATAN
Full text linkPlatinum purpose as a catalysts on the cathode in a fuel cell hydrogen system gets a role in disconnection of O2 molecules. Power adsorption and dissociation of O2 molecules determined the effectiveness and efficiency of the nature of catalyst that is utilized. All this time metal is considered the most effective as a catalyst in fuel cells hydrogen is Pt. After be done investigation and calculation is known about platinum and iron alloy (Pt-Fe) can be utilized as a catalyst that has approached the effectiveness and efficiency of pure Pt metal. One of the way to determine the effectiveness and efficiency of the catalyst Pt-Fe alloys by calculating the value of the potential energy surface (PES). PES value calculation is done using density functional theory calculations. Analysis’s result point out the value of the potential energy surface (PES) O2 molecules in the Pt-Fe metal fusion for -929.8341 Ry with optimal distance of 2.4908 A of Pt-Fe’s metal surface and distances among O atoms as big as 3.3211 A.Keywords: Fuel cell hydrogen, Adsorption dissociation O2, PES, Density functional theory (DFT
ISOLASI DAN KARAKTERISASI SENYAWA STEROID PADA FRAKSI N-HEKSANA DARI DAUN KUKANG (Lepisanthes amoena (HASSK.) LEENH.)
No full textKukang (Lepisanthes amoena (Hassk) Leenh.) Leaves is one of the species that belonging to the Sapindaceae family. Traditionally used as drug ulcerate and skin care and also known it has potency of tironase inhibitor and antioxidant agent, but compound that contained in that plant was unknown. The purpose of this research was for isolating steroid compound of n-hexane fraction from Kukang (Lepisanthes amoena (Hassk) Leenh.) leaves and characterizing steroid compound with phytochemical screening, R f , melting point and IR spectrum. Extraction of 650 grams powder Kukang (Lepisanthes amoena (Hassk) Leenh.) leaves with methanol yielded 121,82 grams of crude methanol extract. The crude methanol extract was fractionated with n-hexane and obtained 2,32 grams of n-hexane fraction. Results of phytochemical screening showed that the n-hexane gave positive result for steroid compound. Separation of steroid compound in n-hexane fraction by column chromatography with silica gel 60 (70-230 mesh) which eluted using n-hexane : ethyl acetate (8 : 2) eluent based on Isocratic method and gave nine fractions. Phytochemical screening by Liebermann Burchard reagent showed F fraction contained steroid compound and have been crystalized needle. Purification by recrystallization of the F fraction gave the needle white crystal 10,2 mg with reterdation factor (R f ) n-hexane : CHCl 3 (1 : 1) = 0,40 ; n-heksana : CHCl 3 (3 : 7) = 0,50 CHCl 3 (100%) = 0,71 ; n-hexane : EtOAc (3 : 7) = 0,82 ; EtOAc (100%) = 0,86. Isolated compound has melting point 143-144°C, IR λmax (cm -1 ): 960,48; 1056,92; 1380,94; 1461,94; 1639,38; 2866,02;2935,46; 3433,06. Based on its physical and spectroscopic characterization, the isolated compound is supposed as sterol of steroid compound
IMPLEMENTASI BAKU MUTU AIR LIMBAH BERBASIS DAYA TAMPUNG BEBAN PENCEMARAN BADAN AIR PENERIMA PADA KEGIATAN PERTAMBANGAN BATUBARA
Full text linkThis research is based on the fact that many rivers in East Kalimantan are complained to be polluted by coal mining activities even though many rules to protect surface waters are in place and obeyed. To explain why it is happened, an audit is conducted to the regulations and to the implementation of the regulations. Desk audit is carried out to assess whether the regulations about waste assimilative capacity and effluent limitation that are currently endorsed are appropriate or not compared to the TMDL concept. The audit of implementation is carried out to assess whether the regulations are applied thoroughly or not. The results is that the technical regulations to determine the class of water and to allocation waste load are absent.Therefore, many regulations related the water quality based effluent limitation are not implemented properly. Most of effluent limitation refer directly to the national or provincial standards that are usually less stringent than the water quality based standard of the local rivers or small rivers. The case study in Loa Haur River obtains that the waste assimilative capacity of the river is 33.696 ton of TSS/day. The WAC that is allocated to 6 (six) coal mining in the sub basin of Loa Haur is 5 ton/day. The allocation is based on their production capacity. The results of water quality based effluent limitation of coal mining companies in the Loa Haur sub basin is 0.17 ton TSS/day or its concentration of 114.63 mg/L.Keywords: Audit, implementation, polluted coal minin
PENGARUH BERAT DAN WAKTU KONTAK UNTUK ADSORPSI TIMBAL(II) OLEH ADSORBEN DARI KULIT BATANG JAMBU BIJI (Psidium guajava L.)
Full text linkResearch about influence of weight and contact times of to adsorb lead(II) by adsorbent from bark of guava has been done. The research was varied by series of adsorbent weight 0.5; 1.0; 1,5; 2.0; 2.5; and 3.0 gram and the contact time 30, 60, 90, 120, 150, and 180 minutes. Concentration of lead(II) in sample is measured by atomic absorption spectrophotometer. The result showed that optimum contact time is 90 minutes. It was also found that higher adsorbent weight will increase the total amount of adsorbed lead(II).Keywords: Adsorption, lead(II), bark, guav
ISOLASI SENYAWA FENOLIK PADA FRAKSI METANOL-AIR DARI UMBI TUMBUHAN SARANG SEMUT (Myrmecodia tuberose Jack)
No full textThe Isolation of phenolic compound in methanol-water fraction from Myrmecodia tuberosa Jack that come from Bulungan have been done. The air-dried powdered from corm of ant plant (Myrmecodia tuberosa Jack) (250 gram) were extracted by methanol at room temperature (27 oC) and fractioned with n-hexane then ethyl acetate. Partition of phenolic compounds in Methanol-Water fraction was chromatographed on silica gel column (35–70 mesh) that eluted with Isocratic method and gave 10 fractions as a result, that fractions were A, B, C, D, E, F, G, H, I dan J fraction. C; E; G and H (alliance fraction) gave the best spot partitioned and the spot was not fluorescence. Purification of alliance fraction gave yellow-brown crystal with retention factor 0.52 that eluted with methanol : ethyl acetat (8:2) whereas the retention factor in methanol 0.82 and ethyl acetate 0,33. Infrared spectrum of alliance fraction shown absorption at value : 3351.83; 2945.33; 2833.04; 1741.00; 1451.60; 1215.67; 885.74 and 776.74 cm-1 with melting point 224 - 228oC. UV and Visible spectrum of alliance fraction shown wavelength at value 263 and 334 nm. Phenolic compounds in Methanol-Water fraction from the corm of ant plant (Myrmecodia tuberosa Jack) was predictioned as phenolic compound of flavonoid group.Keywords : Ant Plant (Myrmecodia tuberosa Jack), Phenolic, Isocratic , Flavonoid, Isolation