Article Per Year (5 Year)
p-Index From 2021 - 2026
0
P-Index
This Author published in this journals
All Journal BERKALA FISIKA SAINS DAN MATEMATIKA
Jun Kawai
Kyoto Univesity, Japan
Mathematics Physics

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search
Journal : BERKALA FISIKA

 1 
MEASUREMENT OF VISCOSITY AND SUCROSE CONCENTRATION IN AQUEOUS SOLUTION USING PORTABLE BRIX METER Hidayanto, Eko; Tanabe, Teruo; Kawai, Jun
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.762 KB)

Abstract

The viscosity of aqueous sucrose solution in various concentrations and the sugar content were measured by using an Ostwald viscometer and a commercial available of portable Brix meter respectively. The increasing of the concentration of sucrose would also followed by increasing viscosity of the solution. Depending on their concentration, the measured value of viscosity of solution would be automatically confirmed into the desired concentration unit. The suitability of Brix meter for other application will be checked.
Quantitative Elemental Analysis of Alkaline Metals in Environmental Samples using Liquid Electrode Plasma Optical Emission Spectrometer Hidayanto, Eko; Yamamoto, Takashi; Kawai, Jun
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (179.185 KB)

Abstract

Element in bottle drinking water, 100% orange juice and coffee and unknown element and concentration in environmental sample were quantitatively analyzed using a portable elemental analyzer of liquid electrode plasma optical emission spectrometer. In order to carry out this purpose, calibration of known element sample was firstly prepared by measuring its emission intensity in various concentrations. Sodium and potassium were commonly detected by this spectrometer, however other elements such as calcium and magnesium were not detected due to the minimum detection limit. The detected element by this portable analyzer shows that its accuracy is enough for quantitative analysis of environmental samples.
Analysis of Sodium, Potassium and Calcium using a Portable Liquid Electrode Plasma Optical Emission Spectrometer Hidayanto, Eko; Yamamoto, Takashi; Kawai, Jun
BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (440.09 KB)

Abstract

Elements of sodium (Na), potassium (K) and calcium (Ca) in beverage samples and river water were analyzed with portable liquid electrode plasma - optical emission spectrometer (LEP-OES). The degree of reproducibility for emission intensities and individual variety of a disposal sample chip were investigated, and measuring conditions for quantitative analysis and the precision was discussed. The sensitivity for Na was higher than those for K and Ca by one or two orders of magnitude. Several ppm of Na and K, and several hundred of Ca in aqueous samples could be quantitatively analyzed with 2-30% of deviation without internal standard. The applied voltage was predominant factor for accurate quantitative analysis, and 800 V was found to be the best voltage estimation for quantitative analysis of alkaline metals contents.
Co-Authors Eko Hidayanto Takashi Yamamoto Teruo Tanabe