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A LOW-COST COLORIMETRIC DETECTION OF HG2+ USING PAPER-BASED SENSOR WITH EUCLIDEAN DISTANCE APPROACH Muh. Supwatul Hakim; Tety Wahyuningsih Manurung; Mokhamat Ariefin; Dwi Hermayantiningsih
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 8 No. 1 (2026): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v8i1.7434

Abstract

Mercury (Hg) is a highly toxic heavy metal that poses significant risks to human health and aquatic ecosystems. The development of rapid and low-cost detection methods is urgently needed. In this work, the paper-based colorimetric sensor was developed by immobilizing dithizone onto Whatman No. 41 filter paper for the detection of Hg2+. The sensor utilized the color change of the sensor from green to orange with the color formation of Hg–dithizone complex. FTIR analysis confirmed the successful immobilization of dithizone with characteristic absorption of C=N and C=S vibrations. For quantification, digital images captured by a smartphone were analyzed using the Euclidean Distance (ED) approach. The sensor demonstrated a linear response in the concentration range of 1–5 mg/L (R2 = 0.991), with a limit of detection (LOD) and limit of quantification (LOQ) of 0.50 mg/L and 1.67 mg/L, respectively. Furthermore, the sensor exhibited high precision with a %RSD of 4.39%. Selectivity tests under acidic conditions confirmed that Hg2+ yielded the highest ED value compared to other metal ions such as Cu2+, Pb2+, Co2+, Ni2+, and Zn2+. This paper-based sensor provides a simple, portable, and cost-effective tool for the on-site monitoring of mercury in environmental samples
PELATIHAN PEMBUATAN PAKAN IKAN MANDIRI DAN PEMASARAN DIGITAL UNTUK PENINGKATAN DAYA SAING USAHA PERIKANAN AIR TAWAR DI PALANGKA RAYA, KALIMANTAN TENGAH Muh. Supwatul Hakim; Riandy Putra; Devi Yuliantina; Ersa Aini Safira; Tasya Amalia; Rahmita Sari
Devote: Jurnal Pengabdian Masyarakat Global Vol. 4 No. 4 (2025): Devote: Jurnal Pengabdian Masyarakat Global, 2025
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/devote.v4i4.4878

Abstract

The fishing industry in Palangka Raya City, Central Kalimantan Province, has great potential for development. However, farmers face problems related to feed availability and prices, as well as limitations in digital marketing. This community service program aims to provide skills to the “Berkat Bersama” Business Group through training in independent fish feed production using local materials with automatic machines and digital marketing training. The activities were carried out in a participatory manner, including preparation and coordination, procurement of materials, assembly of feed printing equipment, module development, dissemination of information on the importance of quality feed and the use of local materials, and training on marketing strategies using digital media. Monitoring and evaluation were conducted through pre-tests, post-tests, and participant testimonials. The pre-test results showed that the majority of participants were in the “Poor Understanding” (75%) and “No Understanding” (12.5%) categories. After the training, there were no more participants in these two categories, while 12.5% of participants reached the “Fair Understanding” category, 25% “Understanding,” and 25% “Very Understanding.” Participant testimonials reinforce that this program is useful as a means to increase independence in feed supply, expand the marketing network for fishery products, and strengthen the competitiveness and sustainability of freshwater fish farming businesses in Palangka Raya.