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All Journal Jurnal Riset Kimia Jurnal Ilmiah Manajemen Kesatuan
Rizky, Amelia
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Chemistry Economics, Econometrics & Finance Social Sciences

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The Effect Of Brand Ambassador, Brand Trust And Brand Image On Purchase Decision On Beauty Product Rizky, Amelia; Rojuaniah, Rojuaniah; Ramli, Abdul Haeba; Gecolea, Zianneil T.
Jurnal Ilmiah Manajemen Kesatuan Vol. 13 No. 2 (2025): JIMKES Edisi Maret 2025
Publisher : LPPM Institut Bisnis dan Informatika Kesatuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37641/jimkes.v13i2.2966

Abstract

This study aims to determine: the influence of brand ambassador, brand trust and brand image on purchase decision. This study uses a quantitative approach and primary data as a data source obtained from a questionnaire. The population of this study is people who know and have bought beauty products. The sample taken was 130 respondents using purposive sampling technique. The method of collecting data by distributing questionnaires using google form, in this study using a Likert scale with a scale of 1-4. This study uses multiple linear regression analysis with the influence of three independent variables and one dependent variable. Based on the results of the research that has been conducted, it shows that brand ambassador have a positive and significant effect on purchase decision, brand trust has a positive and significant effect on purchase decision, and brand image has a positive and significant effect on purchase decision. Brand ambassador, brand trust and brand image together have an effect on purchase decision. This research is expected to provide important insights for marketers in designing effective marketing strategies for beauty products, especially in choosing brand ambassador and building brand trust and positive brand image. Keywords: Brand Ambassador, Brand Trust, Brand Image, Purchase Decision
Study of Aluminum-Copper Electrodes for Chromium and Chemical Oxygen Demand Removal from Tannery Wastewater by Electrocoagulation Rivaldi, Mochammad Heldry; Rizky, Amelia; Hardian, Arie; Murniati, Anceu
Jurnal Riset Kimia Vol. 16 No. 1 (2025): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v16i1.744

Abstract

This study investigates the efficacy of the electrocoagulation (EC) process using aluminum (Al) anodes and cathodes for the treatment of leather tanning wastewater. Initial characterization revealed a chemical oxygen demand (COD) of 901.96 mg/L and total chromium content of 38.741 mg/L, where it exceeds the discharge limit permitted by the Minister of Environment Regulation No. 5/2014, the permissible limit for COD in industrial wastewater is 110 mg/L, and for total chromium, it is 0.6 mg/L. The EC process, conducted under varying conditions of electrolysis time (10, 20, and 30 minutes), potential (2.0, 3.0, 3.5, and 4.5 V), and current intensity (1.0, 2.0, and 3.0 A), demonstrated substantial reductions in both COD and chromium levels. The lowest COD value achieved was 28.05 mg/L at 3A, 4.5 V, and 30 minutes, representing a reduction of 52.09% to 74.50%. Total chromium content was reduced to as low as 0.013 mg/L, indicating a reduction of 90.45% to 97.83%. pH levels were monitored, revealing an increase due to OH- ion formation, with final pH values ranging from 6.38 to 8.34. XRF analysis of the commercial Al anode indicated a composition of 98.1% Al, 0.615% Fe, 0.522% Si, and 0.163% Zn. The findings underscore the effectiveness of the EC process in reducing COD and chromium content in leather tanning wastewater, meeting and exceeding regulatory standards.
Co-Authors Abdul Haeba Ramli, Abdul Haeba Anceu Murniati Arie Hardian Gecolea, Zianneil T. Rivaldi, Mochammad Heldry Rojuaniah Rojuaniah