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TitleAnalysis of samples absorbance susing UV-Vis
TagsUltraviolet Absorbance Spectrophotometry Ultraviolet–Visible Spectroscopy Absorption Spectroscopy
File Size823.5 KB
Total Pages17
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PP uptake was detected in two peaks at a wavelength of 370 and 553 nm. Uptake of

each peak was 0.082 and 0.407.

In this experiment also tested the absorption of red dadap flower extract as a natural

indicator sample. Absorption of red dadap extract without the addition of acid or base

brownish red in color, shows 3 pieces of the peak at a wavelength of 230, 283, and 663

nm. Uptake of each peak is 2.003, 1.166, 0.036. Figure absorption red dadap extract

attached.

Addition of acid to extract red dadap provide 4 pieces of the peak at a wavelength of

225, 284, 532, and 665 with respective absorption peaks are 1.316, 0.635, 0.077, and

0.008. The addition of these top causes dadap extract red color changed from red to

brownish red. Figure absorption dadap extract of red in acidic form.

Addition of bases in extracts of red dadap provide 2 pieces of the peak at a

wavelength of 244 and 579 with respective absorption peaks are 2.458 and 0.444. This

peak reduction causes red dadap extract color changes from red brown to greenish

brown. Figure absorption red dadap extract under alkaline conditions attached.



VI. CONCLUSION

1. Standard curve absorbance relationship with concentration can be made from data

obtained using UV-Vis spectroscopy and copper metal content can be searched,

which acquired levels of copper in copper ore at 99.63%.

2. EPMS can absorb UV-B at wavelengths of 307 with the uptake of 1.834.

3. Dadap red flower extract may be used as a natural indicator because it can change

color in acidic and alkaline.



REFFERENCES

Ismono. 1978. Cara-cara Optik Dalam Analisis Kimia. Diktat. Bandung: Jurusan Kimia ITB

Fessenden, Ralph dan Joan Fesseanden. 1982. Kimia Organik Jilid 1. Jakarta : Erlangga.

Khopkar, S.M. 1990. Basic Concepts of Analytical Chemistry. Terj. Saptoraharjo, A. Konsep

Dasar Kimia Analitk. Jakarta: UI-Press.

Petrucci. 1985. Kimia Dasar Prinsip dan Terapan Modern. Jakarta : Erlangga. Diakses

tanggal 24 April 2008 dari http://www.Kebonkembang.com/neo.

Tim Pembina Ilmu Kimia. 2004. Modul Pembinaan Pembelajaran Kimia Bidang Ilmu Kimia

Fisika. Bali : Jurusan Kimia FMIPA Universitas Udayana.

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