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Mudasir Mudasir
Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta
Chemical Engineering, Chemistry & Bioengineering Chemistry

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STUDY OF MATRIX EFFECT ON THE ANALYSIS OF Ni AND Pd BY AAS IN THE DESTRUATS OF HIDROCRACKING CATALYSTS USING AQUA REGIA AND H2SO4 Wega Trisunaryanti; Mudasir Mudasir; Siti Saroh
Indonesian Journal of Chemistry Vol 2, No 3 (2002)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.51 KB) | DOI: 10.22146/ijc.21914

Abstract

 The matrix effect of various metals on the analysis of nickel and palladium in destruate of catalysts of Butonian asphalt-derived asphaltene by atomic absorption spectroscopy have been investigated. Samples were dissolved by wet decomposition method using aqua regia and then followed by concentrated H2SO4. The solution was evaporated to dryness on a sand-bath. Study of matrix effect was carried out by comparing the absorbance of Ni and Pd with and without the adding of various concentration of metals in the samples. The calibration curve and standard addition methods were applied in the analysis of Ni and Pd. Result of the study showed that matrix effect toward absorbance of Ni is mostly caused by Al and Si contents in the concentration range of 200-500 ppm. Al content in the concentration of 500 ppm, and Si content in the concentration range of 100-500 ppm cause the matrix effect in the analysis of Pd. However, the change in absorbance of Ni and Pd is still below tolerable limit of 10%. The content of Ni in Pd-Ni / zeolit-Y, Ni-Pd/ zeolit-Y, Mo-Ni/ g-alumina, and Ni-Mo / g-alumina with calibration curve technique were 7.44 ± 0.021; 7.62 ± 0.052; 7.75 ± 0.054; and 2.69 ± 0.062 respectively and with standard addition technique were 6.82 ± 0.066; 7.23 ± 0.112; 7.39 ± 0.099; and 2.35 ± 0.055 respectively. Pd content in Pd-Ni / zeolit-Y and Ni-Pd/ zeolit-Y with calibration curve technique were 2.74 ± 0.044 and 2.49 ± 0.051 and with standard addition technique were 2.90 ± 0.015 and 2.69 ± 0.042.
STUDY OF Cr(VI) PHOTOREDUCTION CATALYZED BY CDO-ZEOLITE Endang Tri Wahyuni; Mudasir Mudasir; Saudur Sinambela
Indonesian Journal of Chemistry Vol 2, No 2 (2002)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (75.205 KB) | DOI: 10.22146/ijc.21923

Abstract

An attempt to decrease Cr(VI) ions in the solution which is more toxic than Cr(III) has performed by assisting the photoreduction of Cr(VI) ions catalysed by oxide Cd(II) supported in the zeolite pores (CdO-zeolite). The research consists of preparation, characterization, and photoactivity examination of  CdO-zeolite. The preparation was carried out by ion-exchange method, which was followed by oxidation by flowing oxygen gas at 300oC. Analysis to determine the Cd adsorbed by zeolite and characterization to determine Eg as photocatalyst character was carried out by AAS and diffuses reflectance UV-Visible spectrophotometry (DRUV-Vis) methods, respectively. Photoreduction process was carried out in a closed reactor by radiating a suspension of Cr(VI) solution and CdO-zeolite with UV lamp for period of times. The concentration of unreduced Cr(VI) in the solution was determined by UV-Visible spectrophotometer as biphenyl carbacide complex. The results of the analysis and characterization indicated that the amount of Cd in  CdO-zeolite is 46,832 mg/g and  Eg of CdO-zeolite (3,26 eV) is larger than Eg of CdO (2,38 eV). Photocatalytic examination showed that the photoreduction results are proportional with the Eg values,i.e the results of  Cr(VI) catalyzed by CdO-zeolit are higher than that of by  CdO. Photoreduction of  50 mL solution  Cr(VI) 25 ppm at  pH = 7 catalyzed by  50 mg CdO- zeolite for 25 hours has given maximum result of 65,89 %.
Co-Authors Endang Tri Wahyuni Saudur Sinambela Siti Saroh Wega Trisunaryanti