PERBANDINGAN METODE SPEKTROFOTOMETRI VISIBLE DAN POTENSIOMETRI TERHADAP ANALISIS LOGAM BESI PADA AIR SUNGAI LEMATANG

RAHMAPUTRI, KARTIKA SOPHIA NURCAHYANI and Fatma, Fatma (2023) PERBANDINGAN METODE SPEKTROFOTOMETRI VISIBLE DAN POTENSIOMETRI TERHADAP ANALISIS LOGAM BESI PADA AIR SUNGAI LEMATANG. Undergraduate thesis, Sriwijaya University.

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Abstract

This research compares the methods of iron metal analysis Fe2+ ions using visible spectroscopy and concentration cell potentiometry. The visible spectroscopy method needs to be verified, and the potentiometry method needs to be validated based on ISO 17025:2017, with parameters of linearity, sensitivity, detection limit, quantification limit, accuracy, precision, and measurement uncertainty. The analysis of iron metal using visible spectroscopy is carried out by reducing Fe3+ to Fe2+ and then complexing it with o phenanthroline to form the iron (II) phenanthroline complex. The analysis of iron metal using potentiometry is based on concentration cell, by measuring the potential of Fe3+ solution that has been reduced to Fe2+. Both methods are then applied to measure the iron metal in the Lematang River water. The results of the standard series measurement produced a calibration curve with a linear equation for visible spectrophotometry y = 0.02526x + 0.00004, and for potentiometry concentration cell y = 1.012x+1.122 with R2 values of 0.9986 and 0.9985. The sensitivity values are 0.02526 and 1.012, the detection limits are 0.1916 mg/L and 0.2425 mg/L, and the quantification limits are 0.4774 mg/L and 0.2747 mg/L. The precision values are 4.11% and 7.93%, while the accuracy values are 95.012% and 80.8%. The measurement uncertainty values are ± 0.044 mg/L and ± 0.787 mg/L. The Fe sample in the Lematang River water is (0.894 ± 0.044) mg/L and (1.066 ± 0.787) mg/L. The t-test value of 1.253 and the t-table value of 2.78 (α = 95%) indicate that both methods are not significantly different in analyzing Fe2+ ions.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	spektrofotometri visible, potensiometri, logam besi, uji-t, sel konsentrasi
Subjects:	Q Science > QD Chemistry > QD71-142 Analytical chemistry
Divisions:	08-Faculty of Mathematics and Natural Science > 47201-Chemistry (S1)
Depositing User:	Kartika Sophia Nurcahyani Rahmaputri
Date Deposited:	29 May 2023 07:52
Last Modified:	29 May 2023 07:52
URI:	http://repository.unsri.ac.id/id/eprint/105736

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