Innovative TETA-β-CDP resin optimizes lead and cadmium adsorption from rice, offering precise, reliable heavy metal detection for environmental and food safety.

This article prepared a new adsorption material, triethylenetetramine-modified ¦Â-cyclodextrin cross-linked resin (TETA-¦Â-CDP), and conducted infrared spectrum characterization on it to optimize the adsorption of trace amounts of lead and cadmium. and analytical conditions, a new method for simultaneous separation enrichment/atomic absorption spectrometry determination of lead and cadmium in rice under dynamic conditions was established. At pH 5.5, the sample solution passes through the column at a flow rate of 1.0 mL/min. Pb2+ and Cd2+ in the test solution can be quantitatively enriched by the resin. Its dynamic saturated adsorption capacity is 22.8 and 31.3 mg/g respectively. It is adsorbed on TETA-¦Â -Pb2+ and Cd2+ on CDP can be completely eluted with 0.1 mol/L HCl at a flow rate of 0.8 mL/min. The detection limits (3¦Ò, n=11) of this method for lead and cadmium are 0.038 mg/L and 0.016 mg/L respectively; the linear range is 0.2~20 mg/L and 0.05~2.5 mg/L respectively; the relative standard deviation (RSD) were 2.8% and 1.7% respectively; the standard recovery rates were 97.5%~101.0% and 95.0%~102.5% respectively. This method was used for the determination of trace amounts of lead and cadmium in rice samples with satisfactory results.

Characterization and Design of TETA-β-CDP Resin

In the pursuit of environmental sustainability and public health safety, the development of efficient methods for detecting and removing heavy metals from food sources has become increasingly crucial. The present article introduces a groundbreaking adsorption material, triethylenetetramine-modified β-cyclodextrin cross-linked resin (TETA-β-CDP), which marks a significant advancement in the field of heavy metal adsorption. This novel material has been meticulously designed to optimize the adsorption of trace amounts of lead (Pb) and cadmium (Cd), two pervasive and harmful heavy metals, from contaminated matrices such as rice.

Methodology for Enhanced Heavy Metal Detection

The study embarks on an in-depth exploration of the TETA-β-CDP resin, starting with its infrared spectrum characterization. This foundational analysis confirms the successful modification of β-cyclodextrin with triethylenetetramine, a crucial step in enhancing its affinity towards heavy metals. Building on this, the research delineates a novel method for the simultaneous separation, enrichment, and atomic absorption spectrometry determination of Pb and Cd under dynamic conditions—a technique that stands to revolutionize current practices.

Superior Adsorption Capacity and Resin Recovery

Operating at a pH of 5.5, the method involves passing the sample solution through a column at a flow rate of 1.0 mL/min, whereby Pb2+ and Cd2+ ions are quantitatively enriched by the resin. Impressively, the dynamic saturated adsorption capacity of the resin is documented at 22.8 mg/g for Pb2+ and 31.3 mg/g for Cd2+, showcasing its superior adsorption capabilities. Furthermore, it is demonstrated that the adsorbed Pb2+ and Cd2+ ions can be completely eluted from the TETA-β-CDP using 0.1 mol/L HCl at a flow rate of 0.8 mL/min, facilitating the recovery of the resin for subsequent cycles of adsorption.

Analytical Precision and Reproducibility

The methodological rigor of this study is further underscored by its analytical precision. The detection limits for Pb and Cd are reported at 0.038 mg/L and 0.016 mg/L, respectively, within a linear range of 0.2~20 mg/L for Pb and 0.05~2.5 mg/L for Cd. Additionally, the method exhibits commendable reproducibility with relative standard deviations (RSD) of 2.8% for Pb and 1.7% for Cd. The standard recovery rates, ranging from 97.5% to 101.0% for Pb and 95.0% to 102.5% for Cd, further validate the method’s accuracy and reliability.

Practical Application and Implications for Food Safety

The practical application of this novel adsorption material and analytical method is demonstrated through the determination of trace amounts of Pb and Cd in rice samples. The results are not only satisfactory but also promising for the broader application of this method in food safety and environmental monitoring. By offering a reliable, efficient, and reproducible means of detecting and adsorbing harmful heavy metals, this study contributes significantly to the ongoing efforts to protect public health and ensure the safety of food supplies.

Conclusion and Contribution to Environmental Science

In conclusion, the development of the TETA-β-CDP resin and the associated analytical method represents a notable achievement in the field of environmental science. It paves the way for more effective strategies in the monitoring and removal of heavy metals from food sources, thereby contributing to the global endeavor of safeguarding environmental and public health.

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Original research was done by Zhou Fangqin, Liao Yunxia, Peng Jia, Xiao Yan

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