Bayu Wiyantoko

Universitas Islam Indonesia | UII · Faculty of Mathematics and Natural Sciences

This research has been carried out to compare complexometric titration methods and atomic absorption spectrophotometry in determining water hardness. The complexometric titration method has become the standard method of determining water hardness levels used in various references in several countries. The level of water hardness in several studies...

Validation of the method of determining ascorbic acid by UV-Vis spectrophotometry in packaged drinks has been carried out with variations in the calibration curve range. The calibration curve was made into three variations, low range (between 0-3 ppm), medium range (between 0-20 ppm), and high range (between 0-25 ppm). The validation parameters ana...

The conference is aimed to disseminate the results of research from universities, research centers, and government boards and bring synergy between research and industry. In the spirit of green chemistry, chemical and industrial process for a sustainable and brighter future, the conference will provide the opportunity for more environmental and eff...

Telah dilakukan kajian pengaruh kalibrasi peralatan pengujian moisture and impurities (M&I) dan deterioration of bleachability index (DOBI) pada crude palm oil (CPO). Kalibrasi berfokus pada neraca analitik dan spektrofotometer UV-Visibel sebagai bagian persyaratan dari sertifikasi Laboratorium Pengujian ISO/IEC 17025:2017. Penilaian kondisi neraca...

The present study was carried out to prepare and characterize calcined Mg/Al layer double hydroxides (LDHs) used in the adsorption of methyl orange in an aqueous solution as an anionic dye in a batch system. Synthesis of LDHs using coprecipitation method with Mg/Al ratio of 3:1 and obtained material was treated by hydrothermal treatment for 4 hours...

The hydrolysis process of pineapple leaf fibers has been carried out using sulfuric acid, nitric acid, bentonite catalyst, and activated bentonite catalyst. The sugar content of the hydrolysis product was identified using the phenol-sulfuric acid method by UV-Visible spectrophotometry. The disposal of pineapple leaf is a big problem even though it...

Cobalt determination has been carried out as one of the micro elements in organic fertilizer. The analytical method for the determination of cobalt used SNI 19-7030-2004 about compost from organic domestic waste that has been modified. Sample preparation was carried out by the wet ashing method using 65% nitric acid and perchloric acid. The wet ash...

Potassium is the only monovalent cation-shaped element that plants need and is the third major nutrient for plant growth. This study aims to determine the level of K2O in potassium chloride flake fertilizer using a flame photometer which is a development of the Indonesian National Standard method 02-2805-2005, so it needs to be validated to prove t...

The application of green analysis in the determination of Fe is done by minimizing the amount of material from the standard method (SNI-6989-4-2009) to half, a quarter, and a fifth part. The iron (Fe) test results obtained according to the standard, half, quarter and one-fifth methods respectively were 0.2098; 0.2418; 0.2194; and 0.2080 ppm. These...

This study discusses the development of Indonesian natural zeolite and agricultural waste i.e bagasse ash and rice husk ash as natural adsorbents. These materials were used as an adsorbent for methyl orange and methylene blue adsorption for isotherm and kinetic study. Adsorption kinetic models for methyl orange and methylene blue with all adsorbent...

Cellulose from banana fruit bunch was used as a precursor for doping titanium oxide (TiO2) in producing of TiO2/cellulose adsorbent. Cellulose was obtained by chemical impregnation using potassium hydroxide (KOH) and followed by the hydrothermal process at 250oC for 5 h. The mixture of TiO2 nanoparticles and cellulose was carried out into hydrother...

Method verification of free formaldehyde analysis in leather has been carried out with reference to ISO/TS 17226:2003 – Leather – Chemical Test – Determination of Formaldehyde Content. This test used snow-white goat leather samples and used a colorimetric method with a spectrophotometer instrument. The verification parameters used were linearity, L...

Research has been conducted which were intended to study the feasibility of the method and the quality of Mentaya River water based on chemical oxygen demand (COD) and total solid suspended (TSS) parameters. The method used in this research was based on SNI 6989.73-2009 with the titrimetric for COD analysis and SNI 06-6989.3-2004 using the gravimet...

Based on analytical system, UV-Vis spectrophotometer can be divided into two types, single beam, and double beam. This research will look at the influence of the type of spectrophotometer is used to validate the method of determining nitrite. Validation parameters are compared is the limit of detection (LOD), the limit of quantification (LOQ), line...

An anthocyanin color pigment result from butterfly pea flower maceration has been done. This study aims to determine the effect of time variation in the maceration of anthocyanin butterfly pea flower extract and the stability of butterfly pea flower extract as an indicator of acid-base titration. Color pigment levels were determined quantitatively...

Telah dilakukan pengujian kualitas air bersih dalam air sumur warga sekitar Universitas Islam Indonesia meliputi parameter kesadahan total, logam timbal (Pb), dan kadmium (Cd) berdasarkan metode SNI 6989:2004. Syarat mutu hasil pengujian berdasarkan Peraturan Menteri Kesehatan Republik Indonesia Nomor 416/Menkes/Per/IX/1990. Pengujian kesadahan tot...

The purpose of this study was to determine the order of reaction of hydrolysis process of pineapple leaves by using homogeneous and heterogeneous catalyst and without the catalyst. The homogeneous catalyst used was sulfuric acid and nitric acid with a concentration of 2 M, while the heterogeneous catalyst used was physically activated loam. The hyd...

Determination of performance and uncertainty parameters from P2O5 analysis in inorganic fertilizer conducted by spectrophotometric UV-Visible has been done. This method was conducted in three stages those were preparation, testing and data processing. In the preparation stage, standard solution and reagent solution was made and for the testing stag...

A method for iodine value (IV) determination of Refinery Bleached Deodorized Palm Oil (RBDPO) and stearin with the use of volumetric dan Fourier Transform Near Infrared Spectroscopy (FT-NIR) was compared. The volumetric analysis of iodine value used modification of AOAC Cd 1b-87 method. Validation parameters used were precision. accuracy and contro...

Comparison methods of C-organic determining in organic fertilizers by gravimetry (ash content) and UV-Vis spectrophotometry (Walkley & Black) had been performed. The difference between the two methods was seen from the validation parameters of each method. This research used precision, homogeneity, stability test, control chart and measurement unce...

Comparison method for examination of calcium contents on filter layer water of Borobudur Temple using titrimetric and spectrophotometric methods have been done. The analysis of calcium content by the titrimetric method is using automatic titration with potentiometric principle while by spectrophotometry is using atomic absorption spectrophotometer...

The quality assurance of ash content in coal analysis was conducted using in-house reference material as a daily standard. This analysis was based on ASTM D 3302-12 using Thermogravimetric Analysis (TGA). The quality assurance of can be seen from the control charts, homogeneity test, and stability test. In the creating of the control chart, perform...

The aim of this research was to verify the spectrophotometric method to analyze nitrate in water samples using APHA 2012 Section 4500 NO3-B method. The verification parameters used were: linearity, method detection limit, level of quantitation, level of linearity, accuracy and precision. Linearity was obtained by using 0 to 50 mg/L nitrate standard...

This study investigated the effect of aging temperature on the development of natural zeolite. Natural zeolite was modified by surfactant treatment using cetyltrimethylammonium bromide as the cationic surfactant for mesopore template. Characterization materials used XRD, FTIR and nitrogen physisorption. XRD diffractograms showed variations aging te...

The cation exchange capacity (CEC)measurement has been carried out in natural zeolite by percolation method. The natural zeolite samples used for cation exchange capacity measurement were activated beforehand with physical activation and chemical activation. The physically activated zeolite was done by calcination process at 600 °C for 4 hours. The...

Penelitian bertujuan untuk melihat pengaruh waktu aging pada sintesis material mesopori. Material mesopori hasil sintesis dikarakterisasi dengan XRD, FTIR dan fisisorpsi nitrogen. Analisis XRD menunjukkan bahwa variasi waktu aging berpengaruh pada struktur mesopori dari zeolit alam (MZ). Spektrum FTIR menunjukkan adanya silanol dan siloksan pada sa...

Penelitian bertujuan untuk melihat pengaruh waktu aging pada sintesis material mesopori. Material mesopori hasil sintesis dikarakterisasi dengan XRD, FTIR dan fisisorpsi nitrogen. Analisis XRD menunjukkan bahwa variasi waktu aging berpengaruh pada struktur mesopori dari zeolit alam (MZ). Spektrum FTIR menunjukkan adanya silanol dan siloksan pada sa...

This study used pineapple leaves as a source of cellulose to be converted into glucose using a catalyst and without sulfate acid catalyst. The purposes of this research are to study the effect of hydrolysis using a sulfate acid catalyst and without catalyst, and time of sampling during hydrolysis (30, 60, 90, 120, dan 150 minutes) at 120oC. Determi...

This study aims to study the application of STAD type cooperative learning in the course of Inorganic Chemistry combined with the use of Molymod props. The purpose of this study is to determine whether there is the influence of the application of STAD strategy and props Molymod to students' understanding on the subject of Inorganic Chemistry. Imple...

Telah dilakukan pengujian kualitas pupuk anorganik NPK padat meliputi kandungan nitrogen total, kandungan air dan cemaran logam timbal. Pengujian kualitas pupuk NPK padat dan standar mutu hasi pengujian berdasarkan metode standar SNI 2803 tahun 2010. Pengujian nitrogen total menggunakan metode Kjledahl, kandungan air menggunakan metode Aufhauser da...

Hidrotalsit (HT) telah disintesis dengan menggunakan Al(NO­3)3·9H2O dan Mg(NO­3)2·6H2O pada pH 10±0,5 dengan ratio molar Mg/Al adalah 4:1. Material tersebut dimodifikasi dengan Sodium Dodecylsulfate (SDS) dengan teknik sintesis ex situ dan in situ yang dinyatakan dengan HTDS ex situ dan HTDS in situ. Hasil karakterisasi FTIR menunjukkan munculnya p...

Hidrotalsit (HT) telah disintesis dengan menggunakan Al(NO­3)3·9H2O dan Mg(NO­3)2·6H2O pada pH 10±0,5 dengan ratio molar Mg/Al adalah 4:1. Material tersebut dimodifikasi dengan Sodium Dodecylsulfate (SDS) dengan teknik sintesis ex situ dan in situ yang dinyatakan dengan HTDS ex situ dan HTDS in situ. Hasil karakterisasi FTIR menunjukkan munculnya p...

Telah dilakukan pengujian kualitas pupuk anorganik NPK padat meliputi kandungan nitrogen total, kandungan air dan cemaran logam timbal. Pengujian kualitas pupuk NPK padat dan standar mutu hasi pengujian berdasarkan metode standar SNI 2803 tahun 2010. Pengujian nitrogen total menggunakan metode Kjledahl, kandungan air menggunakan metode Aufhauser da...

This research concerns with the development of natural material i.e. natural zeolite. Natural zeolite were modified by surfactant treatment. Material modification has been done using cetyltrimethyllammonium bromide as cationic surfactant for mesopore template. The physicochemical characters of natural material modified and unmodified was investigat...

Synthesis, characterization, and application of phenylamine modified montmorillonite have been studied. Preparation of phenylamine modified montmorillonite was conducted by intercalation process using simple amine compound. The changes in physical and chemical properties were observed through the crystal structure, functional groups and acidity as...

Borax has been found in food products i.e. on the Indonesian Tofu that is often consumed by people. Generally, the identification of borax in food products hard to do by the public. Indicators of natural materials will allow the public to identify the presence of borax in food easier. Qualitative test for borax on Indonesian Tofu showed purple cabb...

Hydrotalcite materials was synthesized by using Cetyltrimethyl Ammonium Bromide (CTAB) and Mg/Al layered double hydroxide with ratio molar 3:1. Synthesis of CTAB-Mg/Al hydrotalcite was carried out using ex situ co-precipitation method at pH 10±0.5. Removal of phenol was optimum at medium pH 6 and it had optimum contact time in 300 min. It followed...

Synthesis and characterization of Mg-Al hydrotalcite have been studied. Synthesis of Mg-Al hydrotalcite was carried out using co-precipitation method at constant pH followed by hydrothermal treatment at 110°C for 12hours. The effect of Mg/Al molar ratios 2:1 and 3:1 was investigated by using XRD, FTIR, and SEM-EDX. The results showed that these syn...

One way for improving (of improving atau to improve) the quality of patchouli oil was to reduce the acid number. Acid number could be reduced with the use of natural adsorbents. The decreasing percentage acid number of patchouli oils using adsorbents zeolites, bentonite, rub ash, and activated carbon, respectively 4.71 %; 1.45%; 7,84%; and 4.64%. T...

Hydrotalcite is a material which is used in various application and one of them as an adsorbent of Cr(VI). Hydrotalcite was synthesized using co-precipitation method with Al(NO­ 3) 3.9H 2O and Mg(NO 3) 2.6H 2O as raw materials. This research aim to study the initial concentration and adsorption isotherm of Cr(VI) by using Mg/Al hydrotalcite in 180...

Chromium(VI) is one of the metals that is harmful to biota and humans if large amount present in environments. One method for reducing metal contamination of Cr(VI) inaqueous is by adsorption using Mg/Al hydrotalcite with molar ratio 2:1. This study is determined the effect of contact time and adsorption models of Cr(VI) adsorption on Mg/Al hydrota...

This article presents preparation and characterization of copper (II) exchanged TiO(2)-Pillared clay from Indonesian montmorillonite. Two kinds of titania precursors: TiOCl(2) and titanium tetraisopropoxide were used for investigating the effect of titania precursor to the physicochemical character. The materials were analyzed by several techniques...