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Vol. 136, Issue 1, January 2012, pp. 158-165




Measurement and Analysis of Sodium in Vegetables Using ATmega16 Microcontroller Based Spectrophotometer


K. Murugananthan and 1 P. Neelamegam

PG and Research Department of Physics, A.V.V.M Sri Pushpam College (Autonomous),

Poondi-613 503, Thanjavur, Tamil Nadu, India

1 Department of Electronics & Instrumentation Engineering, SASTRA University, Thanjavur 613 402, Tamil Nadu, India

Email: drkmsys@yahoo.com, neelkeer@yahoo.com


Received: 5 October 2012   /Accepted: 24 January 2012   /Published: 28 January 2012


Digital Sensors and Sensor Sysstems


Abstract: ATmega16 microcontroller based portable and inexpensive spectrophotometric system is developed to determine sodium ion concentration in vegetable samples. Light Emitting Diode 0f wave length 530 nm as light source and photodiode as light detector are used for measurement. The developed instrument is used to measure the absorbance, calculate the concentration of sodium in the sample and display the result. This method is based on the reaction between sodium ion with reagent and form a brownish colored complex which gives the maximum absorbance at 530 nm of wavelength. Statistical analyzes are carried out to check the performance of the developed instrument. Linear regression analysis reveals the excellent correlation with correlation coefficient (r) of 0.99864. The developed system shows the good performance characteristics and the results are in good agreement with 98 % of confidence level in comparison with current clinical spectrophotometric method.


Keywords: Microcontroller, LED, Spectrophotometer, Sodium, Vegetables sample


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