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All Journal Journal of Food and Pharmaceutical Science Nusantara Science and Technology Proceedings
Erni Wijayanti, Erni
2 Faculty of Pharmacy, Gadjah Mada University, Yogyakarta 55281, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Engineering Immunology & microbiology Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology

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Development and validation of atomic absorption spectrometry for the determination of zink and mercury analyzer for determination of Mercury in cream cosmetics Rohman, Abdul; Wijayanti, Erni
Journal of Food and Pharmaceutical Sciences Vol 3, No 2 (2015): J. Food Pharm. Sci (April-June)
Publisher : Fakultas Farmasi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (367.361 KB) | DOI: 10.14499/jfps

Abstract

An atomic absorption spectrometry for the quantification of zink (Zn) and mercury analyzer  for the quantification of mercury (Hg) levels in cream cosmetic were developed and validated. The method was validated for linearity and range, precision, accuracy, limit of detection (LOD) and limit of quantification (LOQ). The standard curves were linear over the concentration of 0.1-1.2 µg/mL (Zn) and 0.05-2.0 µg/L (Hg) with coefficient of correlation (r) > 0.99. The detection limits obtained were 2.8614 µg/g sample (Zn) and 0.4749 ng/g sample. The quantification limit  obtained were 9.5281 µg/g sample (Zn) and 1.5827 ng/g sample. The relative standar deviation (RSD) values found to be 8.67 % for its intraday precision and 9.89 % for its interday precision (Zn) and 12.69 % for its intraday precision and 7.17 % for its interday precision (Hg). These RSD values are lower than those required by RSD Horwitz unction. The mean recovery percentage was 94.28 % (for Zn) and 78.65% (for Hg). These developed methods were succesfully used for determination of Zn and Hg in cream cosmetics products. Key words: mercury, zink, atomic absorption spectroscopy, mercury analyzer, cream cosmetic
Debt Policy Analysis Through Profitability as Moderating Variables in Property & Real Estate Companies That Go Public on the IDX Wijayanti, Erni; Pertiwi, Tri Kartika
Nusantara Science and Technology Proceedings 5th International Seminar of Research Month 2020
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2021.0938

Abstract

This study is aimed at examining profitability in moderating the effect of dividend policy and business risk on debt policy by using the population of property & real estate companies that go public on the IDX for the 2016-2018 period. Using purposive sampling to obtain a sample of 34 companies. Using moderated regression analysis with absolute difference testing as an analysis technique. So that the dividend policy results are obtained, business risk can contribute to debt policy, profitability can moderate the effect of dividend policy on debt policy, and profitability can moderate the effect of business risk on debt policy.
Co-Authors Abdul Rohman Tri Kartika Pertiwi