Article Per Year (5 Year)
p-Index From 2021 - 2026
1.037
P-Index
This Author published in this journals
All Journal Jurnal Riset Kimia Sains Natural: Journal of Biology and Chemistry Chemistry Indonesian Journal of Chemical Research Journal Of Research and Education Chemistry (JREC) Makara Journal of Science Indonesian Journal of Chemical Engineering
Lee Wah Lim
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Materials Science & Nanotechnology

Published : 10 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search
Journal : Makara Journal of Science

 1 
Determination of Polycyclic Aromatic Hydrocarbons (PAHs) Using Environmentally Friendly Liquid Chromatography Kurnia, Asep; Lim, Lee Wah; Takeuchi, Toyohide
Makara Journal of Science Vol. 22, No. 1
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

An analytical methodto determine polycyclic aromatic hydrocarbons (PAHs) is required to obtain high-quality analytical results. The purpose of this study is to achievegood separation ofa few PAHs by using environmentally friendly liquid chromatography. Accordingly, a liquid chromatograph incorporating a fluorescence detector, UV detector, and a capillary column is employed herein to simultaneously minimize the use of chemicals and obtain analytical results better than those obtained using aconventional column. Observation parameter include single analysis ofeach PAH, method valida-tion, the new stationary phase, the effectof mobile phase concentration, and Quenchereffect. The PAHs tested include naphthalene, phenanthrene, anthracene, fluoranthene, and pyrene. The test results show that when using an acetonitrile concentration of 100%, the retention times of different PAHs do not differ significantly. Furthermore, upon decreasing the acetonitrile concentration, the retention time increases, and better separation was achieved. The value ranges of precision, LOD, LOQ, and linearity are 3.43 – 12.42%, 4.7–15.1 mg/L, 15.6 – 50.5 mg/L, and 0.87–0.99, respectively. The new Sil-S-ImC30 stationary phase showed good results in terms of separation of PAHs. Likewise, the use of 60, 70, 80, and 90% acetonitrile as the mobile phase in combination with 0.03 M acrylamide as the quencher affected retention time but not separation.
Determination of Carbofuran on Hydrophilic Interaction Liquid Chromatography using TSKgel®Amide-80 as a Stationary Phase Kurnia, Asep; Lim, Lee Wah; Takeuchi, Toyohide
Makara Journal of Science Vol. 20, No. 4
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydrophilic interaction liquid chromatography (HILIC) equipped with an environmentally friendly capillary column was employed to investigate the retention behavior of carbofuran; a polar stationary phase was used as well. Several conditions were conducted to investigate the retention behavior of carbofuran, such as a comparison study TSKgel®Amide-80 with another polar column, a comparison study retention behavior of carbofuran on various wavelengths, the water content effect on HILIC mode, the effect of buffer concentration on HILIC mode, and the analytical performance of carbofuran. The results showed that TSKgel®Amide-80 exhibited a better performance than other polar stationary phases in carbofuran determination, and observations at wavelengths of 251 and 254 nm showed higher absorbance for carbofuran than others. In addition, the increase of water content and salt buffer concentration in the mobile phase led to a shorter retention time. The recovery of this method was 101 ± 10.1%, while the limit of detection and the limit of quantification were 0.66 ppm and 2.22 ppm, respectively. Consequently, TSKgel®Amide-80 offers a good perform
Co-Authors Abdi Dharma Amrillah, Nafira Alfi Zaini Anang Sedyohutomo Dhias Cahya Hakika Edison Munaf Edison Munaf Fajri, Joni Aldilla Firda Mahira Alfiata Chusna Furqani, Firda Hillman, Prima Fitria Ilona Bella Indrawati - Indrawati Indrawati Jamilatun, Siti Jamilatun Kurnia, Asep Lia Anggresani Marlena, Yuni Maryudi Mulyadi, Irwan Ningsih, Devi Yogi Noviana Nuraini Nuraini Nurmelinda, Nurmelinda NURUL WULANDARI Rahayu, Aster Rahmiana Zein Refilda Refilda Toyohide Takeuchi Veranica Vivi Sisca Yulianis Yulianis