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INDONESIA
Indonesian Journal of Chemistry and Environment
Published by Universitas Negeri Yogyakarta
ISSN : -     EISSN : 25993186     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science
Indonesian Journal of Chemistry and Environment (IJCE) is a journal which covers all the field of chemistry and environment, both experimental and theoretical aspects. Regular papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. Authors are encouraged to submit complete original and unpublished works, which are not under review and considered to be publish in any other journals.
Arjuna Subject : -
Articles 3 Documents
 1 
Search results for , issue " Vol 2, No 1 (2018): June 2018" : 3 Documents clear
SYNTHESIS OF SILICA GEL FROM GLASS WASTE AND ITS APPLICATION ON SOLID PHASE EXTRACTION OF Pb(II) CATIONS Novisatri, M.B.; Priyambodo, E.; Sunarto, S.
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2018): June 2018
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijce.v2i1.19576

Abstract

Waste glass is one of inorganic wastes which are significant in Indonesia and has not been handled properly. The high content of SiO2 in the glass waste allowed to be processed into silica gel through sol-gel methods. In this research, waste glass was destructed into micro size particles. After that, it was reacted with a sodium hydroxide solution, thus forming a solution of sodium silicate. Silica gel was obtained by reacting sodium silicate with hydrochloric acid. After a silica gel obtained, silica gel is dried and then characterized using infrared spectrophotometry. Using a glass column, silica gel is used as solid phase on solid phase extraction in terms of preconcentration of Pb(II) cations. Based on this research, preconcentration of Pb(II) cations by solid phase extraction using silica gel from glass waste is an effective method.
Atomic Absorption Spectrophotometric Method for Magnesium and Iron Determination in Goat Milk Powder Kusumaningtyas, H.; Febiana, H.; Septiani, L.
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2018): June 2018
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijce.v2i1.19586

Abstract

This research aims to determine the levels of magnesium and iron in goat milk powder. The method of this research was atomic absorption spectrophotometry. The research subject is goat milk powder while the research object is the amount of magnesium and iron in goat milk powder. Before analyzing, the first step is removing organic substances in the sample that could interfere the analysis by dissolved it in concentrated nitric acid and heated. Based on the measurement using atomic absorption spectrophotometry method, absorbance and concentration of magnesium and iron in the sample were obtained. The analysis showed that the levels of magnesium and iron in the sample were 0.00317 mg/g and 0.02177 mg/g.
Analysis of Free Fatty Acid in Frying Oils of Various Foodstuffs Setianingsih, A.; Febrianto, F.; Riyani, A.
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2018): June 2018
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijce.v2i1.19454

Abstract

Cooking oil is one of the basic human needs as food processing media. Repeated use of cooking oil by heating at high temperature will produce free fatty acid levels. This study aims to determine the levels of free fatty acids in frying oils of various foodstuffs that is chicken, catfish, and flour with acid base titration method.  The study population was frying oils of various foodstuffs of 0, up to 5th. The results of fatty acid levels in the repeated use of chiken (sampel A), catfish (sample B) and flour foodstuffs shows the Fatty Acid levels exceed safe limits set by SNI 7709:2012. The oil before was used = 0.24% and on sample A: the oil of first frying (A1) = 0.49%,  5th frying (A5) = 0.73%. ALB sample B: first frying (B1) = 0.49%, 5th frying (B5) = 0.68%. ALB sample C: first frying (C1) = 0.49%, 5th frying (B5) = 0.77%. The increase of free fatty acid was influeced of the oil was many used to frying because level water in foodstuffs.

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