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All Journal PROSIDING SEMINAR KIMIA KOVALEN: Jurnal Riset Kimia Jurnal Kimia Mulawarman JURNAL ATOMIK
Bohari Yusuf
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science

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Journal : PROSIDING SEMINAR KIMIA

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ADSORPSI LOGAM KADMIUM (Cd) MENGGUNAKAN ADSORBEN AMPAS TEH DENGAN METODE CELUP Tiara Izza Nafila; Bohari Yusuf; Teguh Wirawan
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Tea waste adsorbent can be utilized for cadmium metal adsorption. The aim of this study was to determine the optimumcontact time, optimum pH, and maximum adsorption capacity using the batch method and the dip method. The concentration of cadmium was determined by complexing using dithizone and measured using a UV-Vis spectrophotometer at a wavelength oh 518 nm. The results were obtained in the batch method at the optimum contact tme of 10 minutes, the optimum pH of 10, and teh maximum adsorption capacity of 157,1282 mg/g. in the dip method the optimum contact time was 30 minutes, and the maximum adsorption capcity was 76,7932 mg/g. the type of isotherm obtained on the adsorption of cadmium metal oh the tea dregs adsorbent was the Langmuir isotherm. Keywords: Tea dregs, adsorption, cadmium, dip method
ANALISA KADAR FOSFAT DAN NITRIT PADA SAMPEL AIR DANAU DENGAN MENGGUNAKAN METODE SPEKTROFOTOMETRI Marlisa Roro Putri; Bohari Yusuf; Ika Yekti Lianasari
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Lake water plays an important role as a water resource and as a habitat for aquatic ecosystems. However, increasing human activities around the lake have led to pollution, particularly by phosphate and nitrite compounds originating from domestic and industrial waste. This study aims to determine the levels of phosphate and nitrite in lake water samples from the southern (AP1) and western (AP2) parts of the Polder using the UV-Vis spectrophotometry method. Phosphate analysis was conducted based on SNI 6989.31:2005, and nitrite analysis was based on SNI 06-6989.9-2004 using a UV-Vis spectrophotometer. The results showed that phosphate levels in samples AP1 and AP2 were 0.053 mg/L and 0.046 mg/L, respectively, while nitrite levels at both points were 0.055 mg/L. These parameters are still below the quality standard thresholds set by Government Regulation No. 22 of 2021. These findings indicate that the water quality of the Polder lake still meets the established environmental standards. Therefore, the UV-Vis spectrophotometry method is effective for water quality monitoring, and the results of this study can serve as a basis for sustainable aquatic environmental conservation efforts. Keywords: Lake, Phosphate, Nitrite and UV-Vis Spectrophotometer.
MINI-REVIEW: APLIKASI SPEKTROFOTOMETRI UV-VIS PADA PENETAPAN PENGARUH MATRIKS TERHADAP PB DENGAN PENGOMPLEKS ALIZARIN SULFONAT Nurhafida; Bohari Yusuf; Alimuddin
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Heavy metal contamination, particularly lead (Pb), is a serious environmental issue due to its toxic nature and ability to accumulate in the food chain. Common analytical methods such as AAS and ICP-OES offer high accuracy but require expensive instruments and complex procedures. As a simpler and more economical alternative, UV-Visible spectrophotometry utilizes the formation of coordination complexes between Pb²⁺ ions and complexing reagents such as alizarin sulfonate. This mini review discusses the interaction between Pb and alizarin sulfonate, the working principle of UV-Vis spectrophotometry, and the influence of sample matrices on complex stability. The review indicates that this method provides valid, rapid, and efficient results, and can be effectively applied to environmental samples with complex matrices, provided appropriate sample preparation and method validation are conducted. Keywords: Lead (Pb), UV-Vis Spectrophotometry, Alizarin Sulfonate, Complex Formation
Co-Authors Agustin Pratiwi Alimuddin Alimuddin Alimuddin Aman Sentosa Panggabean arifin syam syam Azwar Amin Firman Arif Saputra Ika Yekti Lianasari Indra Kurniawan Isma Avessa Lianasari, Ika Yekti Manja’a Khasanah Marlisa Roro Putri Moh Syaiful Arif Moh. Syaiful Arif Nur Asmawati Nurhafida Rahmat Gunawan Rientha Septiana Rudi Kartika, Rudi Rusnawati Rusnawati Saibun Sitorus Savitri Nur Bahriana Selvi Yanti Soerja Koesnarpadi Suaibatul Aslamiah Suci Andriyaningrum Syafrizal Syafrizal Teguh Wirawan Tiara Izza Nafila Yuni Astria