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Ika Yekti Lianasari
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Chemistry

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KINERJA ANALITIK KOMPLEKS Cu(II)-NINHIDRIN SECARA SPEKTROFOTOMETERI Ika Yekti Lianasari; Teguh Wirawan; Krisma Megayanti Dasima
PROSIDING SEMINAR KIMIA Prosiding SNKT Himpunan Mahasiswa Kimia FMIPA UNMUL 2021
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

Sebuah metode spektrofotometri untuk penentuan senyawa kompleks Cu(II)-Ninhidrin telah diteliti. Tahapan pada penelitian ini adalah uji kualitatif ion logam terhadap ninhidrin. Selanjutnya dilakukan optimasi pembentukkan kompleks dengan penentuan panjang gelombang maksimum, variasi pH, perbandingan mol logam : mol ligan Cu(II)-ninhidrin dan variasi waktu. Kemudian dilanjutkan dengan kinerja analitik dengan parameter linearitas, presisi dan limit deteksi. Hasil pengukuran panjang gelombang maksimum dengan spektrofotometer UV-Vis kompleks Cu(II)-ninhidrin mempunyai panjang gelombang 352 nm, pH optimum terjadi pada pH 9, perbandingan mol logam : mol ligan Cu(II)-ninhidrin adalah 1:3, dan kestabilan terjadi pada waktu 30 sampai 40 menit menghasilkan warna kompleks hijau kekuningan. Hasil kinerja analitik diperoleh linieritas (R2), presisi (%RSD) dan limit deteksi berturut-turut adalah 0,9908; 2,93% dan 0,2298 mM.Kata kunci : Cu(II), Ninhidrin, Spektrofotometer UV-Vis
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.
Co-Authors Bohari Yusuf Krisma Megayanti Dasima Marlisa Roro Putri Teguh Wirawan