Key Takeaways & Executive Findings
- •• Ag-doped TiO2 synthesized via solution combustion exhibits enhanced electrochemical sensing performance for nitrite and phosphate detection. • Doping with Ag refines particle size, increasing specific surface area and electron transfer efficiency, as confirmed by EIS. • The sensor shows high sensitivity (2 µA·µM–1·mm–2 for nitrite, 2.1 µA·µM–1·mm–2 for phosphate) and low detection limits (0.0052 mM and 0.0045 mM, respectively). • The material holds promise for practical sensing devices to monitor nitrite and phosphate levels, addressing food safety and health concerns.
Abstract
To prevent bacterial growth and ensure food safety, common practice involves the use of nitrite and phosphate salts. Nevertheless, elevated nitrite levels in the body can contribute to the development of stomach and esophageal cancers, while excessive phosphate levels may increase the risk of kidney dysfunction and the onset of osteoporosis. Electrochemical sensing has emerged as a reliable technique for detecting nitrites and phosphates. This study specifically focuses on the use of TiO2-based sensing materials for such detection. The synthesis of nanoparticulate TiO2 and Ag-doped TiO2 was successfully achieved through a solution combustion technique. The composition of the materials was examined using X-ray diffraction (XRD) and X-ray absorption near-edge structure (XANES) methods, revealing a predominant anatase composition. Doping resulted in particle refinement, contributing to an increased specific surface area and enhanced electron transfer efficiency, as indicated in the examination by electrochemical impedance spectroscopy (EIS). Cyclic voltammetry (CV) assessed the electrochemical behavior, demonstrating that in nitrite detection, a significant oxidation reaction occurred at an applied voltage of approximately 1.372 V, while in phosphate detection, the main reduction peak occurred at a voltage close to –0.48 V. High sensitivity (2 µA·µM–1·mm–2 for sodium nitrite and 2.1 µA·µM–1·mm–2 for potassium phosphate) and low limits of detection (0.0052 mM for sodium nitrite and 0.0045 mM for potassium phosphate) were observed. Experimental results support the potential use of Ag-doped TiO2 as a sensing device for nitrites and phosphates.
1. Introduction
Sodium nitrite, a common additive in processed meats, is employed to prevent bacterial growth. However, prolonged consumption of sodium nitrite in significant quantities can have adverse health effects. At higher temperatures or when interacting with certain amino acids or bacteria, nitrite can convert into nitrosamine compounds known to be carcinogenic [1]. Excessive sodium nitrite consumption has also been linked to nitrite poisoning, which manifests as headaches, dizziness, nausea, and vomiting [2]. Additionally, elevated blood nitrite levels can lead to methemoglobinemia, a condition where oxygen binding to hemoglobin is hindered, impeding oxygen transport to body tissues [2–3]. Nitrite is not restricted solely to the domain of food; it can also be found in the environment, particularly within water and air. Due to its abundance from various sources and the potential for severe health consequences, the monitoring of nitrite consumption holds significant significance. The World Health Organization (WHO) has established guidelines, setting the maximum allowable daily nitrite intake at a range of 1.6 to 9.5 g or 0.07 mg/kg of body weight [4–5]. Assessing the health risks associated with nitrite exposure necessitates the measurement of nitrite levels in bodily fluids like blood and urine, marking a matter of utmost importance.
Potassium phosphate is a frequently used food additive that plays multiple roles. It serves several purposes, including balancing the acidity of dairy products and acting as a stabilizer in emulsions like salad dressings and sauces. Phosphate takes on various forms within the human body, including dihydrogen phosphate (H2PO4) and mono-hydrogen phosphate (HPO4), and can be found in compounds such as phospholipids, adenosine triphosphate (ATP), and nucleic acids [6–7]. Monitoring phosphate levels is crucial, particularly for individuals dealing with endocrine disorders and kidney issues. Moreover, an excessive buildup of phosphate in the body can lead to damage to cellular tissues and the development of tumors [8]. Severe hyperphosphatemia, characterized by concentrations exceeding 4.6 mg/dL, can result in conditions like vascular calcification, muscle cramps, joint discomfort, cognitive impairment, and anemia [9–10]. As for dietary recommendations, adults are advised to aim for a daily intake of 700 mg of phosphate. However, for individuals aged 71 and older, as well as pregnant women, the recommended upper limit of phosphate intake is set at 3000 mg/day.
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Thura Lin Htet, Sira Sripirommit, Manasbodin Asava-arunotai, Myo Myo Thu, Gasidit Panomsuwan, Ratchatee Techapiesancharoenkij, Pinit Kidkhunthod, Jintara Padchasri, Oratai Jongprateep (2025). Enhanced nitrite and phosphate detection through Ag-doped TiO2 sensing material. Int. Journal of Minerals, Metallurgy and Materials (矿物冶金与材料学报). https://doi.org/10.1007/s12613-025-3119-5
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Frequently Asked Questions
What is the main focus of this research?
The research focuses on developing an Ag-doped TiO2 sensing material for the electrochemical detection of nitrite and phosphate, aiming to address health and food safety concerns.
How was the Ag-doped TiO2 material synthesized?
The material was synthesized using a solution combustion technique, which is a simple and efficient method for producing nanoparticulate TiO2 and Ag-doped TiO2.
What are the key performance metrics of the sensor?
The sensor exhibits high sensitivity (2 µA·µM–1·mm–2 for sodium nitrite and 2.1 µA·µM–1·mm–2 for potassium phosphate) and low detection limits (0.0052 mM for nitrite and 0.0045 mM for phosphate).
Why is detecting nitrite and phosphate important?
Elevated nitrite levels can lead to cancers and methemoglobinemia, while excessive phosphate can cause kidney dysfunction and osteoporosis. Monitoring these ions is crucial for health and food safety.
What techniques were used to characterize the material?
The material was characterized using X-ray diffraction (XRD), X-ray absorption near-edge structure (XANES), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV).
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