Application and Development of Wayeal's Atomic Absorption Spectrophotometer in the Environmental Industry

The environmental industry is a rapidly growing field encompassing various aspects such as pollution control, resource recovery, and ecological conservation. Its market scale continues to expand, and technological innovation is advancing steadily. As a core instrument for heavy metal detection in environmental analysis, the atomic absorption spectrophotometer possesses an authority and accuracy that are unlikely to be fully replaced in the foreseeable future. It is enhancing its efficiency through automation, intelligence, and hyphenated techniques to meet the demands of modern laboratories for large-scale, high-throughput operations.

Application of Atomic Absorption Spectrophotometer in the Environmental Industry

The atomic absorption spectrophotometer developed by Wayeal provides a precise and reliable solution for heavy metal pollution detection in the environmental sector. Based on the principle of characteristic spectral line absorption, this technology enables accurate measurement of toxic heavy metals such as lead, cadmium, mercury, and arsenic, as well as pollutant elements like copper, zinc, and nickel, in environmental media including water, soil, and solid waste.

In the fields of environmental monitoring and pollution control, our solution supports multiple detection modes, including flame, graphite furnace, and hydride generation methods. With detection sensitivity reaching the ppt level, it fully complies with both domestic and international environmental regulations, such as the "GB 3838-2002 Environmental Quality Standards for Surface Water," "GB 15618-2018 Soil Environmental Quality Standards," and "GB 5085.3-2007 Identification Standards for Hazardous Wastes." For complex environmental sample matrices, we offer professional pretreatment solutions, including microwave digestion, high-pressure vessel digestion, and ultrasonic extraction, to ensure the accuracy and representativeness of test results.

In terms of detection efficiency, the Wayeal AA2300 series atomic absorption spectrophotometer is equipped with an automatic sampling system and an intelligent analysis platform, enabling continuous automatic detection of large batches of environmental samples. The instrument features a built-in data quality control system, complete with functions such as automatic recording of detection data, hierarchical permission management, and operational audit trails, providing robust technical support for environmental law enforcement, pollution source investigation, and ecological restoration.

Major Reference Standards in the Environmental Industry

Typical Industry Application Cases

Lead

Cadmium

Experimental Precautions:

1. Experimental Conditions: For lead (Pb) and cadmium (Cd): injection volume: 20μL; pyrolytic coated graphite tube.

2.The nitric acid, hydrofluoric acid, and perchloric acid used in the experiment are strongly oxidizing and corrosive. Hydrochloric acid is highly volatile and corrosive. Reagent preparation and sample digestion must be carried out inside a fume hood. Operate with appropriate personal protective equipment as required to avoid inhalation or contact with skin and clothing.

Nickel

Experimental Precautions: When using the 232.0nm absorption line for nickel determination, interference from nearby nickel triplet spectral lines may occur. Selecting a spectral bandwidth of 0.2nm can mitigate this effect.

Potassium Element - Flame Emission Method

Sodium Element - Flame Emission Method

Experimental Precautions:

1.Flame Emission Method: Potassium and sodium are prone to ionization and exhibit high emission intensity in the flame. A mixed standard solution can be prepared to suppress ionization interference.

2.Flame Absorption Method: The burner head must be rotated when detecting potassium and sodium. For potassium testing: Rotate the burner head until an absorbance of approximately 0.0100 Abs is achieved at a concentration of 0.1mg/L. For sodium testing: Rotate the burner head until an absorbance of approximately 0.0300 Abs is achieved at a concentration of 0.1 mg/L.

Aluminum

Experimental Precautions:

1.Experimental Conditions for Aluminum: injection volume: 20μL; pyrolytic coated graphite tube.

2.Aluminum is an element highly susceptible to contamination. During graphite furnace atomic absorption analysis, it is essential to prevent contamination from solvents and reagents.

3.Under high-temperature conditions, aluminum can react with the graphite tube to form aluminum carbide, resulting in low sensitivity, high memory effects, and significantly reduced service life when using ordinary graphite tubes. It is recommended to use Wanyi's specialized pyrolytic coated graphite tube for aluminum determination.

4.When measuring aluminum in certain matrices, increasing the drying temperature and extending the drying time can help improve measurement reproducibility.

5.Nitric acid of analytical grade or higher should be used to ensure a low aluminum background. Literature indicates that aluminum background levels can vary significantly between nitric acid from different manufacturers.

6.In graphite furnace determination of aluminum, the atomization temperature in the heating program is relatively high. Temperature calibration must be performed before initiating the heating program.

7.During graphite furnace determination of aluminum, attention should be paid to cleaning the graphite furnace chamber and performing empty burns of the graphite tube.

Barium

Experimental Precautions:

1.Experimental Conditions for Barium: injection volume: 20µL; pyrolytic coated graphite tube.

2.When determining barium using the graphite furnace method, the condition of the graphite tube and the accuracy of the heating temperature are highly sensitive. It is recommended to use imported pyrolytic coated graphite tubes for measurement. Additionally, due to graphite tube wear over time, temperature calibration must be performed before initiating the heating process.

3.In the wavelength range near 553.6nm, CaOH exhibits strong molecular absorption, which can cause background interference.

4.When determining barium using the graphite furnace method, attention should be paid to the radiation absorption generated by the graphite tube itself.

5.For graphite furnace determination of barium, use high current and narrow slit (recommended current: 6 mA–8 mA; slit width: 0.2nm).

6.The heating programs may vary slightly for each atomic absorption instrument. Therefore, it is necessary to adjust and optimize the heating program in the graphite furnace debugging interface according to the specific on-site conditions.

Chromium

Experimental Precautions:

1.For graphite furnace determination of chromium: injection volume: 20μL, pyrolytic coated graphite tube

2.When using the flame method to determine chromium, a fuel-rich flame must be employed for detection.

Tin

Experimental Precautions:

1.Experimental Conditions for Tin: injection volume: 20μL, pyrolytic coated graphite tube

2.The acidity of the standard solution must be consistent with that of the sample solution to ensure the accuracy of data testing. This principle applies to all elements.