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INDONESIA
Indonesian Journal of Chemistry and Environment
Published by Universitas Negeri Yogyakarta
ISSN : -     EISSN : 25993186     DOI : 10.21831
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Materials Science & Nanotechnology
Articles are welcome that deal with theoretical analysis, meta-anaysis reviews, and result of research or empirical studies from all aspect of Chemistry and Environment. Reports on new methodologies and comprehensive assessments of existing ones, as well as applications to new types of problems are especially welcome. Experimental papers are expected to be brought into relation with theory, and theoretical papers should be connected to present or future experiments. Manuscripts that apply routine use or minor extensions or modifications of established and/or published experimental and theoretical methodologies are appropriate if they report novel results for an important problem of high interest and/or if they provide significant new insights.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol 2, No 1 (2019): June 2019" : 5 Documents clear
Utilization of Natural Coagulant Substance (Tamarind and Winged Bean Seed) on the Quality of Tofu Wastewater in Muntilan, Magelang S. E. Elpani; M. J. Gunawan; E. Aviventi; R. A. Sabila
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (551.171 KB) | DOI: 10.21831/ijce.v2i1.30294

Abstract

The aim of this study is to determine the effect of various mass in tamarind and winged bean seeds on pH, TDS, and COD in tofu factory wastewater. The research was conducted at the Chemistry Research Laboratory of FMIPA UNY in December 2018.  The results showed that the addition of various mass in tamarind and winged bean seeds as much as 7, 9, and 11 grams of tofu factory wastewater had an effect on pH which increased from the initial condition of 2.5 to 2.6; 2.7; 2.8 in tamarind seeds, and 2.8; 2.9; 3.0 on winged beans. The COD test increased from the initial condition of 6619.20 mg / L to 7312, 64; 7880, 00; 8195.20 mg / L in tamarind seeds, and 9140.80; 10464.64; 9329.92 mg / L in winged bean seeds which have decreased again in the addition of 11-gram coagulant substance mass. TDS test has increased from the initial conditions of 1512 mg / L to 1715; 1736; 1848 mg / L in tamarind seeds, and 1890; 1988; 1855 mg / L in winged bean seeds. 
Determination of Free Fatty Acid in Frying Oils of Various Foodstuffs F. Febrianto; A. Setianingsih; A. Riyani
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (531.862 KB) | DOI: 10.21831/ijce.v2i1.30288

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 aim to determine the levels of free fatty acids in frying oils of various foodstuffs which were 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 (sample A), catfish (sample B) and flour foodstuffs shows the fatty acid levels exceed safe limits set by SNI 7709:2012. The fatty acid levels of the oil before it used was 0.24%. The increase of free fatty acid was influeced by how many the coocing oil used to frying. The highest level of fatty acid in coocing oil was reached after the fifth of friying. It happened because the level water in foodstuffs increase due to the used of coocing oil
Adsorption of Cu(II) and Zn(II) on Liquid Waste of Electroplating Home Industry using Silica based Adsorbent Prepared from Glass Waste Y. P. Saputri; E. Priyambodo
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (603.845 KB) | DOI: 10.21831/ijce.v2i1.30290

Abstract

This study aims to (1) knowing the optimum pH and adsorption contact time of Cu(II) and Zn(II) ions in liquid waste of electroplating by silica gel prepared from glass waste, and (2) knowing the adsorption of Cu(II) and Zn(II) ions in liquid waste of electroplating by silica from glass waste. Synthesis of silica gel using sol gel method. In this method, a powder of glass waste is reacted with sodium hydroxide solution to form sodium silicate. Hydrochloric acid solution was added into the sodiumsilicate to form silica gel. Adsorption of Cu(II) and Zn(II) metal ions was done by batch method at various pH and contact time. The experiments shows that  (1) the optimum pH and the optimum contact time for Cu(II) adsorption was 7 and 3 hours, therefore the optimum pH and the optimum contact time for Zn(II) was 8 and 3 hours, (2) the adsorption effectiveness of Cu(II) and Zn(II) in liquid waste of electroplating by silica from glass waste  occurred in pH 7 for 3 hours were 99.9300% and 95.4200%.
Determination of Magnesium and Iron in Goat’s Milk Powder by Flame Atomic Absorption Spectrophotometry H. Kusumaningtyas; H. Febiana; L. Septiani
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.962 KB) | DOI: 10.21831/ijce.v2i1.30291

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 was goat milk powder. Moreover, the research object was the amount of magnesium and iron in goat’s milk powder. Before analyzing, the first step was 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 flame 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 0.0032 mg/g and 0.0218 mg/g.
Adsorption of Cr on Liquid Waste of Tannery Industry using Banana Peel Charcoal in various pH and Time Activation A. D. Atmasari; F. Amaliya; L. Puspitasari
Indonesian Journal of Chemistry and Environment Vol 2, No 1 (2019): June 2019
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.253 KB) | DOI: 10.21831/ijce.v2i1.30292

Abstract

The purpose of the research is to determine the effect of activation time of banana peel charcoal on the adsorption capacity of Cr metal's tannery industry. Banana peel charcoal is made by carbonization process followed by activation using HCl solution with varying time. The activated charcoal with optimum activation time is used to determine the optimum pH of tannery waste on adsorption Cr metal. Banana peel as much as 600 grams then carbonized can form 42 grams of banana peel charcoal. The concentration of Cr metal initial that contained in tannery waste was 292.1 ppm. The optimum activation time is 1 hour, with decreasing Cr metal as much as 141.87 ppm using 1 gram of banana peel activated charcoal. While the pH variation of waste does not provide a significant difference.

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