Simple Method for Determination of Sodium Using Photogrammetry
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Abstract
The main purpose of this work is to study the possibility of using the digital image from digital camera and read RGB value by RGB reader program for determination of sodium in sport drinks sample. The present method is provides a simple, inexpensive instrumentation and rapid method. Materials and methods: The propose method was based on aspirated the standard or sample solution into burner which was ignited the flame by mixing fuel between air-acetylene gas. Digital image of fame emission was recorded using digital camera. The pictures of the flame emission from standard sodium solution and sport drinks sample were processed to read the RGB value using in-house GetPixel program. The RGB reader method was applied to quantification sodium from sport drinks sample and the results was compared to the flame atomic emission spectrophotometric method. Results: The calibration curve for standard sodium solution shown an excellent linearity over a concentrations range of 0.4 - 2.0 µg mL-1. Over the above concentrations range, liner regression of the RGB values (y) and concentration of sodium (x) expressed the equation y = 2.9031x + 0.9313. The correlation coefficients (r²) was shown to be 0.9901 (n=5). The limit of detection(LOD) and the limit of quantitation(LOQ) were determined for sodium, based on the criteria that the signal-to-noise ratio for LOD and LOQ are 3:1 and 10:1, respectively, for sample to blank. The results of LOD and LOQ were found to be 0.12 and 0.38 µg mL-1, respectively. Effect of some possible flavor sugars (glucose, dextrose and sucrose) and interfering ions (K+, Zn2+and Mg2+) on the determination of sodium were investigated using the developed method. All of flavor sugars and metal ions caused interference <±2.5 %. Conclusion: A simple method for determination of sodium in sport drinks was developed. The proposed simple RGB reader method and flame atomic emission spectrophotometric method showed positive agreement with no statistical difference at 95% confidence level. The study in this work has demonstrated the potential for RGB reader technique which were shown the simple procedure and cost-effective method.
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