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All Journal Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
Wijayanti
Department of Plastic and Rubber Processing Technology, Politeknik ATK Yogyakarta, 55188, Special Distric of Yogyakarta, Indonesia

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LIMIT OF DETECTION (LOD) AND LIMIT OF QUANTITATION (LOQ) OF DR 1900 SPECTROPHOTOMETER FOR DYES ANALYSIS Wijayanti; Siti Rochmah
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 23 No. 1 (2024): Berkala Penelitian Kulit, Sepatu, dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/nj9fsk58

Abstract

Dyes is not easily degraded in the environment. It can be causing environmental pollution. The concentration of these dyes must be monitored when using it in a process. The most common method to measuring dye’s concentration is spectrometry, such as using dr 1900 spectrophotometer. There for, it necessary to know the limit of detection (lod) and limit of quantitation (loq) of the spectrophotometer. This study aims to determine the ability of the dr 1900 spectrophotometer to analyze ay-25 by determining the lod dan loq values. The results showed that the lod value was 0.01871 mg/l and the loq was 0.02308 mg/l. This means that dr 1900 spectrophotometer is capable pf providing a response for the analysis of ay-25 dye with a minimum analyte amount of 0.01871 mg/l, and if the measurement f ay-25 dye using the dr 1900 spectrophotometer show a value of 0.02308 mg/l or higher, then the mausrement results are considered to have a good accuracy and precision.
OPTIMIZATION OF CONDITION FOR METHYLEN BLUE ADSORPTION USING ACTIVATED COMMERCIAL ZEOLITE Wijayanti
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 23 No. 1 (2024): Berkala Penelitian Kulit, Sepatu, dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/2fg9bp64

Abstract

Dye is the one of the industrial waste which is not degraded easily in the environment. Methylen blue is a dye that is often used in industries and can be an environmental pollution. Adsorption is used in this research to solve the problem. This study used an activated commercial zeolite. The adsorption conditions were optimized based on adsorbent mass, contact time, and the initial concentration of adsorbate. The results showed that the optimum condition was using 3 grams of adsorbents with contact time of 60 minutes and initial concentration of adsorbate not more than 125 mg/L. This adsorption followed pseudo-second order kinetic model and Freundlich isoterm model.
LABORATORY SCALE OF RAYON FIBER MANUFACTURING: MANUAL STIRRING AND STIRRING USING A MAGNETIC STIRRER Dewi Nurhidayati; Warmiati; Wijayanti
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 23 No. 1 (2024): Berkala Penelitian Kulit, Sepatu, dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/kjmm1s79

Abstract

Laboratory scale production of rayon fiber has been carried out using manual stirring and a magnetic stirrer. The aim of this research is to compare rayon fiers produced through manual stirring and magnetic stirrer stirring. Experiments on making rayon on a laboratory scale are carried out for educational purposes which often have obstacles due to the limited availability of mixing equipment, such as magnetic stirrer. The method used in making rayon in this research is through the formation of cuprammonium ions. The results show that there is no significant difference between rayon produced manual stirring and magnetic stirrer stirring. It means that the manual mixing can be applied in the learning process for making rayon due in order to get around the limitations of available mixing equipments.
ANALYSIS OF METAL CONTENTS IN WELL WATERAT THE ATK YOGYAKARTA POLYTECHNIC LABORATORY Warmiati; Wijayanti; Armila Zahra Tawarniate; Dewi Nurhidayati
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit Vol. 23 No. 1 (2024): Berkala Penelitian Kulit, Sepatu, dan Produk Kulit
Publisher : Politek ATK Yogyakarta Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58533/5wrznv09

Abstract

This sudy has been conducted to determine the metal content in water used for laboratory activities at Politeknik` ATK Yogyakarta. The water used for laboratory processes should ideally be free from metal content to avoid contamination and corrosion. The metal content analyzed in this research includes Cu, Pb, Cr, adn Fe. The analysis method used is spectrophotometry, specifically Atomic Absoprtion Spectrophotometry (AAS), using standard series. The samples to be analyzed are first destructed according to the method outlined in SNI 6989 – 84: 2019. The analysis results obtained are as follows: Cu content in water sample is 0.046 mg/L, Pb content is 3.031 mg/L, Cr metal is 0.023 mg/L, and Fe content is 6.372 mg/L.
Co-Authors Armila Zahra Tawarniate Dewi Nurhidayati Siti Rochmah Warmiati