Analysis of the Industrial Salt Industry Status in 2025: Industrial Salt is Widely Used in the Chemical Industry
Created on 09.29
China Report Hall Network reports that in 2025, market demand for industrial salt, a basic raw material in the chemical industry, will continue to grow. Industrial salt is widely used in a variety of fields, including alkali production, soap making, metallurgy, and pharmaceuticals, earning it the nickname "the mother of the chemical industry." However, heavy metal impurities such as lead and cadmium in industrial salt pose a potential threat to the environment and human health. Therefore, accurately detecting lead and cadmium in industrial salt is crucial for ensuring product quality and environmental safety. This paper investigates the application of atomic absorption spectrometry (AAS) combined with matrix modifiers to provide an efficient and accurate method for detecting lead and cadmium in industrial salt.
I. The Importance of Lead and Cadmium Detection in Industrial Salt
The "2025-2030 China Industrial Salt Industry Market Research and Investment Prospects Analysis Report" states that industrial salt is an indispensable basic raw material in the chemical industry and is widely used in various fields. However, industrial salt may contain heavy metal impurities such as lead and cadmium. Long-term accumulation of these heavy metals in the human body can pose serious health risks. In recent years, with growing environmental awareness and increasing quality control requirements, the detection of heavy metals in industrial salt has garnered increasing attention. While traditional detection methods can provide adequate results, the detection of lead and cadmium in high-salt matrix samples is often affected by background interference, resulting in inaccurate results. Therefore, developing a detection method that can effectively correct for matrix interference is crucial for the quality control of industrial salt.
II. Experimental Method for Detecting Lead and Cadmium in Industrial Salt
(I) Experimental Instruments and Reagents
The instruments used in this experiment include an atomic absorption spectrometer (AAS), along with associated digestion equipment and an analytical balance. High-purity nitric acid, ammonia, and deionized water were used as reagents, along with national standard lead and cadmium solutions. All reagents met the experimental requirements, ensuring the accuracy of the experimental results.
(II) Sample Digestion Method
Sample digestion is a key step in the detection process. The industrial salt sample was placed in a polytetrafluoroethylene digestion vessel, an appropriate amount of nitric acid was added, and digestion was performed using a microwave digestion system. After digestion, the solution was transferred to a volumetric flask, brought to volume, and set aside. This process ensured the complete release of lead and cadmium from the sample, providing a sound foundation for subsequent testing.
(III) Instrument Parameters and Standard Curve Plotting
During the AAS detection process, the detection wavelengths for lead and cadmium were 283.3 nm and 228.8 nm, respectively. The online addition of matrix modifiers effectively corrected instrument signal drift and matrix interference. Standard curves were constructed by measuring standard solutions of varying concentrations using linear regression with absorbance as the ordinate and mass concentration as the abscissa. The experimental results showed a good linear relationship between the mass concentration and absorbance of lead and cadmium, with linear correlation coefficients greater than 0.9990.
III. Analysis of Lead and Cadmium Detection Results in Industrial Salt
(I) Precision Experiment
Precision experiments are an important means of evaluating the reliability of a detection method. Industrial salt samples were tested repeatedly, and the relative standard deviations were calculated. The results showed that the relative standard deviations for both lead and cadmium were less than 2%, demonstrating good precision.
(II) Recovery Experiment
The recovery experiment is used to evaluate the accuracy of a detection method. Standard solutions of known lead and cadmium concentrations were added to industrial salt samples, and the test was performed according to the experimental method. The results showed that the recoveries of lead and cadmium ranged from 90.1% to 114% and 90.1% to 110%, respectively, both within acceptable ranges, demonstrating the high accuracy of the detection method.
(III) Detection Limit Test
Analysis of the current status of the industrial salt industry indicates that the detection limit is an important indicator of the sensitivity of a detection method. By repeatedly measuring blank samples, the instrument detection limits for lead and cadmium were calculated to be 0.01 mg·kg⁻¹ and 0.001 mg·kg⁻¹, respectively. This demonstrates that this method can detect extremely low concentrations of lead and cadmium, meeting the requirements for heavy metal detection in industrial salt.
IV. Conclusion
This paper establishes an efficient and accurate method for the detection of lead and cadmium in industrial salt by studying atomic absorption spectrometry combined with the application of matrix modifiers. Experimental results demonstrate that this method exhibits excellent linearity, precision, and accuracy, effectively correcting for matrix interferences, and improving the reliability of test results. With the development of the industrial salt industry, this detection method will provide strong support for industrial salt quality control and environmental safety.
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