IDENTIFIKASI UNSUR-UNSUR KIMIA PADA UBI JALAR (IPOMOEA BATATAS L) DAN UBI KAYU (MANIHOT ESCULENTA) DENGAN TEKNIK LASER INDUCED BREAKDOWN SPECTROSCOPY (LIBS)

ANGGI EKA SAFITRI, . (2024) IDENTIFIKASI UNSUR-UNSUR KIMIA PADA UBI JALAR (IPOMOEA BATATAS L) DAN UBI KAYU (MANIHOT ESCULENTA) DENGAN TEKNIK LASER INDUCED BREAKDOWN SPECTROSCOPY (LIBS). Sarjana thesis, UNIVERSITAS NEGERI JAKARTA.

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Abstract

Ubi merupakan makanan pokok ketiga di Indonesia setelah padi dan jagung. ubi tidak memiliki masa panen yang berbeda-beda dan mempunyai banyak jenis diantaranya ubi jalar (Ipomoea batatas L) dan ubi kayu (Manihot esculenta) mengakibatkan perbedaan sifat fisika dan kimia. Dalam penelitian ini dilakukan eksperimen dengan teknik Laser Induced Shockwave Plasma Spectroscopy (LISPS) menggunakan laser Nd-YAG (1064 nm,10 Hz) yang dioperasikan pada mode Q-Switch pada sampel ubi kayu, dan ubi jalar yang sudah dikeringkan. Penelitian dilakukan untuk mengidentifikasi dan membandingkan kandungan unsur-unsur kimia dari kedua sampel ubi. Sampel diletakkan pada suatu ruang yang terbuat dari logam dimana tekanan udaranya dapat divakumkan dan divariasikan dengan pompa vakum. Plasma dibangkitkan dengan memfokuskan berkas (pulsa) laser pada permukaan sampel dengan lensa pemfokus melalui window. Radiasi plasma dideteksi menggunakan spektrometer yang dilengkapi dengan fiber optik. Radiasi plasma dideteksi menggunakan spektrometer yang dilengkapi dengan fiber optik. Hasil yang didapatkan pada sample darah yaitu terdeteksinya unsur yaitu), kalsium (Ca), natrium (Na), dan magnesium (Mg). *****Sweet potatoes are the third staple food in Indonesia after rice and corn. Sweet potatoes do not have different harvest periods and there are many types, including sweet potatoes (Ipomoea batatas L) and cassava (Manihot esculenta), resulting in differences in physical and chemical properties. In this research, experiments were carried out using the Laser Induced Breakdown Spectroscopy (LIBS) technique using an Nd-YAG laser (1064 nm, 10 Hz) operated in Q-Switch mode on dried cassava and sweet potato samples. Research was conducted to identify and compare the chemical element content of the two sweet potato samples. The sample is placed in a chamber made of metal where the air pressure can be vacuumed and varied with a vacuum pump. Plasma is generated by focusing a laser beam (pulse) on the sample surface with a focusing lens through a window. Plasma radiation is detected using a spectrometer equipped with optical fiber. Plasma radiation is detected using a spectrometer equipped with optical fiber. The results obtained from the blood sample were the detection of elements namely calcium (Ca), sodium (Na), magnesium and (Mg).

Item Type:	Thesis (Sarjana)
Additional Information:	1. Prof. Dr Mangasi Alion Marpaung, M.Si 2. Dr.Ivan Tanra
Subjects:	Sains > Fisika
Divisions:	FMIPA > S1 Fisika
Depositing User:	Anggi Eka Safitri .
Date Deposited:	23 Aug 2024 00:50
Last Modified:	23 Aug 2024 00:50
URI:	http://repository.unj.ac.id/id/eprint/50478

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