Inovasi Sensor Impedansi Berbahan Multi-Walled Carbon Nanotubes (Mwcnt) Untuk Monitoring Kandungan Ion Nitrat, Kalium, Dan Fosfat Dalam Larutan

Adi, Pranata Nuari (2025) Inovasi Sensor Impedansi Berbahan Multi-Walled Carbon Nanotubes (Mwcnt) Untuk Monitoring Kandungan Ion Nitrat, Kalium, Dan Fosfat Dalam Larutan. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penurunan kualitas air akibat tingginya konsentrasi ion nitrat, kalium, dan fosfat menjadi isu penting di bidang lingkungan dan pertanian. Kandungan ketiga ion tersebut yang melebihi ambang batas dapat menyebabkan gangguan ekosistem, eutrofikasi, hingga berdampak negatif bagi kesehatan manusia. Oleh karena itu, diperlukan alat pemantauan ion yang akurat, sensitif, dan ekonomis. Penelitian ini bertujuan untuk mengembangkan sensor impedansi berbahan dasar Multi-Walled Carbon Nanotubes (MWCNT) sebagai solusi deteksi ion dalam larutan. Sensor dibuat dengan mencampurkan bubuk MWCNT dan resin, kemudian dikarakterisasi menggunakan larutan standar KNO3, Na3PO4, dan KCl dalam variasi konsentrasi 0.1–30 PPM. Pengukuran impedansi dilakukan menggunakan RCL meter pada rentang frekuensi 0.05–200 kHz. Hasil analisis menunjukkan bahwa frekuensi 0.05 kHz memberikan nilai regresi terbaik (R2 mendekati 1), dengan sensitivitas tertinggi terhadap ion fosfat (1.22 kΩ/PPM), diikuti kalium (1.01 kΩ/PPM), dan nitrat (0.76 kΩ/PPM). Sensor juga menunjukkan akurasi tinggi (>90%) dalam rentang 0.1–15 PPM, yang merupakan rentang konsentrasi kritis untuk aplikasi pemantauan kualitas air. Terdapat hubungan linier antara konsentrasi ion dan impedansi yang diukur. Dengan demikian, sensor MWCNT ini memiliki potensi sebagai alat deteksi real-time yang efisien, kurat, dan berbiaya rendah untuk pemantauan kualitas air di berbagai bidang seperti lingkungan dan pertanian.
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The decline in water quality due to high concentrations of nitrate, potassium, and phosphate ions has become a significant issue in the fields of environment and agriculture. Excessive levels of these ions can lead to ecosystem disruptions, eutrophication, and negative impacts on human health. Therefore, an accurate, sensitive, and cost-effective ion monitoring device is required. This study aims to develop an impedance sensor based on Multi-Walled Carbon Nanotubes (MWCNTs) as a solution for ion detection in solution. The sensor was fabricated by mixing MWCNT powder with resin and then characterized using standard solutions of KNO3, Na3PO4, and KCl with varying concentrations from 0.1 to 30 PPM. Impedance measurements were performed using an RCL meter across a frequency range of 0.05-200 kHz. The analysis results showed that a frequency of 0.05kHz yielded the best regression value (R2 close to 1), with the highest sensitivity toward phosphate ions (1.22kΩ/PPM), followed by potassium (1.01kΩ/PPM) and nitrate (0.76kΩ/PPM). The sensor also demonstrated high accuracy (>90%) within the 0.1-15 PPM range, which is a critical concentration range for water quality monitoring applications. A linear relationship was observed between ion concentration and measured impedance. Therefore, the MWCNT-based sensor shows great potential as an efficient, accurate, and low-cost real-time detection device for water quality monitoring in various environmental and agricultural applications.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Fosfat, Kalium, Kualitas air, MWCNT, Nitrat, Regresi polinomial, Sensor impedansi Impedance sensor, MWCNT, nitrate, potassium, phosphate, polynomial regression, water quality
Subjects:	Q Science > QC Physics > QC1 Dielectrics Q Science > QC Physics > QC100.5 Measuring instruments (General)
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45201-(S1) Undergraduate Thesis
Depositing User:	Pranata Nuari Adi
Date Deposited:	02 Jul 2025 06:55
Last Modified:	02 Jul 2025 06:55
URI:	http://repository.its.ac.id/id/eprint/119330

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