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P. Suarya

Program Studi Kimia FMIPA Universitas Udayana, Jimbaran, Bali, Indonesia

Author-ID : 2922005

Chemistry

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STUDI ADSORPSI ION FOSFAT OLEH BATU KAPUR BUKIT JIMBARAN P. Suarya; A. A. B. Putra; N. L. P. Mahadewi
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

The presence of phosphate ions in the aquatic environment can cause disturbance of water balance, such as the increase of fertility of quatic plants resulting in water surface closure. Sunlight will be obstructed and the exchange of oxygen in water is also disrupted. Various attempts to remove phosphate ions have been carried out, adsorption is one of the promising alternative methods to reduce these ions from the waters because of the high effectiveness and the cost required for the preparation of the adsorbent is quite cheap. The general objective of this research was to study the selectivity of limestone in adsorpting phosphate ions. The results obtained can complement the data on the use of limestone which in turn can be used as a reference in the management of wastewater contaminated by phosphate ions. The ability of limestone in adsorping phosphate ions was tested using the Batch method with an investigation on the variations of the adsorption time and the concentration of phosphate ions. Limestone characterization test results before and after activation showed an increase in limestone characteristics as follows: surface acidity increased from 0.50 to 1.40 mmol/g and the specific surface area increased from 12.66 to 25.61 m2 /g. The amount of phosphate adsorped to the activated limestone at the optimum contact time of 15 minutes was of 3.125 mg/g, and at the concentration of 70 ppm was of 3.094 mg/g following the Langmuir adsorption isotherm pattern with an R2 value of 0.9981. Keywords: activation, adsorption, characterization, limestone, phosphate ion

KADAR Fe DAN Zn DALAM KRIM KENTAL MANIS KEMASAN KALENG EXPIRE DAN NON EXPIRE MENGGUNAKAN HIDROGEN PEROKSIDA (H2O2) UNTUK DESTRUKSI BASAH SECARA SPEKTROFOTOMETRI SERAPAN ATOM (SSA) Putri Go; I W. Sudiarta; P. Suarya
Jurnal Kimia (Journal of Chemistry) Vol.13 No.2 Juli 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Sweetened condensed milk is generally packaged in a can which is made from iron and zinc. Iron and zinc can have corrosion with the increasing of contact time and changing condition so that they will contaminate the milk. The purpose of this research are to determine the best wet destruction method, find out the effect of adding 30% H2O2 at varied volume in the process of wet destruction, to find out Fe and Zn content in expire and non-expired sweetened condensed milk and to compare the results with the national quality standard. Sample was wet destructed by using variation of 70% HNO3: 30% H2O2 which is 3:0 (method A); 3:0.5 (method B) 3:1 (method C); 3:2 (method D) then the results were measured by using Atomic Absorption Spectrophotometer. Analysis of Fe used standard addition curve method whereas the analysis of Zn used calibration curve method. The results of the analysis showed that the best variation of HNO3:H2O2 in wet destruction method was 3:0.5 for Fe analysis and 3:2 for Zn analysis. The addition of 30% H2O2 at varied volume in wet destruction for Fe analysis gave significantly different results for non-expired sweetened condensed milk but were not significantly different for expired sweetened condensed milk. Whereas, the analysis of Zn gave significantly different results for both non-expired and expired sweetened condensed milk. The metal content in the expired and non-expired sweetened condensed milk which were wet destructed by using the best solvent compotition obtained 0,2759 and 0,7126 mg/kg for Fe and 4,1645 and 2,4367 mg/kg for Zn metal. The Fe and Zn content in the sweetened condensed milk are still below the maximum limit that set by SNI. Keywords: Fe, H2O2, Atomic Absorption Spectrophotometer, sweetened condensed milk, Zn

SINTESIS DAN KARAKTERISASI SILIKA GEL DARI ABU VULKANIK GUNUNG AGUNG MELALUI TEKNIK SOL-GEL N. P. S. N. Utari; I W. Sudiarta; P. Suarya
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Mount Agung in Karangasem, Bali which erupted in September 2017 produced abundant volcanic ash. This ash can be used as a raw material for making silica gel. The stages of the research carried out included analysis of the content of silicon (Si), synthesis of silica gel using sol-gel technique, characterization using FTIR, X-RD instruments as well as surface acidity. The results of the analysis using the X-RD instrument showed the presence of silicon from SiO2 found at 2? = 28,07530. The silica gel yield obtained in this study was 15.05% w/w. The results of the characterization with the FTIR instrument showed that silica gel from volcanic ash of Mount Agung had the main Si-OH and Si-O-Si groups. The hydroxyl bond from Si-OH grup were found at ±3649.32 cm-1 for stretching vibrations and ±1687,71 cm-1 for bending vibrations. Si-O bond from Si-O-Si group were found at ±1207.44 cm-1 for asymmetric stretching vibrations and ±482.20 cm-1 for bending vibrations. Diffractogram showed that the silica gel had an amorphous structure with surface acidity of 18.0222 mmol/g and a surface area of 36.5514 m2/g. Keywords: Agung mountain, silica gel, sol-gel, vulcano ash

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