Abstract
Silicon plays a very important role in the growth of rice. The study of the relationship between rice and silicon has become a hot area in the last decade. Currently, the silica-molybdenum blue spectrophotometric method is mostly used for the determination of silicon content in rice. However, the results of this method vary greatly due to the different choices of reducing agents, measurement wavelengths and color development times. In this work, we present for the first time an electrochemical sensor for the detection of silicon content in rice. This electrochemical analysis technique not only provides an alternative detection strategy, but also, due to the rapid detection by electrochemical methods and the miniaturization of the instrument, it is suitable for field testing. Methodological construction using electrochemical techniques is a key objective. The silicon in rice was extracted by HF and becomes silica after pH adjustment. The silica was then immobilized onto the glassy carbon surface. These silica nanoparticles provided additional specific surface area for adsorption of sodium borohydride and Ag ions, which in turn formed Ag nanoparticles to fabricate an electrochemical sensor. The proposed electrochemical sensor can be used for indirect measurements of 10–400 mg/L of SiO2, and thus, the method can measure 4.67–186.8 mg/g of silicon. The electrochemical sensor can be used to be comparable with the conventional silicon-molybdenum blue spectrophotometric method. The RSD of the current value was only 3.4% for five sensors. In practical use, 200 samples of glume, leaf, leaf sheath and culm were tested. The results showed that glume had the highest silicon content and culm had the lowest silicon content. The linear correlation coefficients for glume, leaf, leaf sheath and culm were 0.9841, 0.9907, 0.9894 and 0.993, respectively.
Highlights
Silicon is one of the beneficial elements for all plants and is one of the essential nutrients for species of the Poaceae, Beta, Equisetum and some diatom species [1,2,3]
When the electrode was immersed into AgNO3, Ag ions were generated on the surface of the electrode due to the reducing properties of NaBH4 and form a designed electrochemical sensor
The glassy carbon electrode (GCE) modified with silica can grow extra Ag nanoparticles
Summary
Silicon is one of the beneficial elements for all plants and is one of the essential nutrients for species of the Poaceae (rice, wheat, etc.), Beta, Equisetum and some diatom species [1,2,3]. A daily intake of 20 to 50 mg of silicon from food is sufficient for the normal growth and development of the human body [8]. There is a direct correlation between the performance of the catalyst and the amount of substrate, so the signal of the catalytic reaction can reflect the amount of substrate This gives a strategy that can be used for the indirect determination of silicon. The electrochemical signals recorded on the sensor with and without silica toward hydrogen peroxide reflect the silicon content in rice. Using the performance of the catalyst to reflect the amount of inert substrates provides a new analytical methodology This methodology can be further extended to the measurement of other electrochemically inert nanoparticles
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