Explore an improved method for determining inorganic arsenic in rice using hydride atomic fluorescence spectrometry, offering accuracy and efficiency.

Improve the pretreatment method for the determination of inorganic arsenic using hydride atomic fluorescence spectrometry in GB/T 5009.11-2003 “Determination of total arsenic and inorganic arsenic in food”. The results showed that: the rice sample was ultrasonic extracted at 60¡ãC for 35 minutes and placed for 25 minutes before being put on the machine. The paired t test (t=1.37, P>0.05) showed that there was no significant difference between the measurement results and the analysis results of the national standard method. The detection limit of this method is 0.015 mg/kg, the linear range is 0-200 ¦Ìg/L, the recovery rate is 93.8%-106.0%, and the relative standard deviation is 3.3%. It has the advantages of simplicity, rapidity, low interference, accuracy and reliability, and is suitable for Determination of large batches of samples for quality inspection institutions

Introduction to Improved Arsenic Determination Method

In the field of food safety, the accurate determination of toxic elements such as inorganic arsenic is critical. The standard method outlined in GB/T 5009.11-2003, “Determination of Total Arsenic and Inorganic Arsenic in Food,” has been the benchmark for assessing arsenic levels in food products. However, continuous improvements in analytical methods are essential for enhancing accuracy, reducing sample processing time, and increasing overall efficiency. This post outlines an improved pretreatment method for determining inorganic arsenic in rice samples, utilizing hydride atomic fluorescence spectrometry.

Details of the Improved Pretreatment Method

The modified approach involves ultrasonic extraction of rice samples at 60°C for 35 minutes, followed by a resting period of 25 minutes before analysis. This method is not only streamlined but also ensures that the integrity of the arsenic measurement is maintained. A comparative analysis using the paired t-test (t=1.37, P>0.05) indicated no significant difference between the results obtained with this modified method and those acquired through the traditional national standard method. This equivalence in results underscores the validity and effectiveness of the new procedure.

Key to the efficacy of the revised method is its analytical performance. The detection limit achieved is notably low at 0.015 mg/kg, which is crucial for detecting minimal traces of inorganic arsenic that could be harmful even at low concentrations. Furthermore, the method exhibits an excellent linear range of 0–200 µg/L, making it versatile for various levels of arsenic concentrations expected in food samples.

The recovery rate of this method ranges between 93.8% and 106.0%, affirming its reliability in quantifying arsenic accurately within the tested samples. Such a high recovery rate is vital for ensuring that the method can consistently replicate accurate results across different sample matrices and concentration levels. Additionally, the relative standard deviation stands at 3.3%, reflecting the method’s precision and reproducibility, which are paramount in quality control and regulatory compliance.

Analytical Performance and Advantages

An essential advantage of this improved method is its simplicity and rapidity, which facilitates the handling of large batches of samples, a common requirement for quality inspection institutions. The procedure is also characterized by low interference, which minimizes the risk of cross-contamination or external factors skewing the results, thus enhancing the method’s accuracy and reliability.

Benefits for Quality Inspection and Compliance

In summary, the improved pretreatment method for the determination of inorganic arsenic using hydride atomic fluorescence spectrometry offers significant advancements over the existing national standard. Its application is recommended for routine quality inspections and compliance testing in food safety laboratories. The method not only aligns with regulatory standards but also sets a new benchmark for the rapid and reliable analysis of arsenic in food products, especially rice, thereby supporting public health and safety initiatives effectively.

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Original research was done by Zhang Yining, Pan Leiming, Xu Rongnian, Xu Ping, Zhao Hongbo, Jin Xin

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