ASTM D3867 Determination of Nitrate Nitrite in Water by Automated Colorimetry
The ASTM D3867 method is an established protocol for the determination of nitrate and nitrite in water samples using automated colorimetric analysis. This technique is widely recognized for its precision, reliability, and ease of use. The method involves the reduction of nitrate to nitrite by a copper–copper(II) sulfate complex, followed by the measurement of the nitrite concentration through a colorimetric reaction.
The process begins with proper sample preparation. This includes filtering the water samples to remove particulates and ensuring that the pH is within an acceptable range for accurate analysis. Once prepared, the samples are analyzed using a spectrophotometer equipped with the appropriate cuvettes and reagents. The absorbance at specific wavelengths is measured, which correlates directly to the concentration of nitrate and nitrite in the sample.
The ASTM D3867 method is particularly useful for monitoring water quality in various sectors such as municipal water treatment plants, industrial facilities, and agricultural runoff systems. Compliance with this standard ensures that environmental regulations are met and that public health risks associated with elevated levels of nitrate and nitrite are minimized.
The acceptance criteria for the ASTM D3867 method are stringent, ensuring high-quality results. Samples must be analyzed in triplicate to ensure consistency. The precision of the method is typically within ±5% of the true value. This ensures that any discrepancies can be readily identified and corrected.
| Sector | Application |
|---|---|
| Municipal Water Treatment Plants | Regulatory compliance and public health protection. |
| Industrial Facilities | Emission control and waste management. |
| Agricultural Runoff Systems | Water quality monitoring and pollution prevention. |
- Municipal water treatment plants use this method to ensure compliance with drinking water standards set by the EPA.
- Industrial facilities apply this test to monitor wastewater discharge and prevent non-compliance with environmental regulations.
- Agricultural runoff systems utilize this method for source water quality monitoring, helping to mitigate potential nitrogen pollution issues.
Scope and Methodology
The scope of the ASTM D3867 method covers the determination of nitrate (NO3-) and nitrite (NO2-) in water samples, including surface waters, groundwaters, and industrial effluents. The method is designed to provide accurate quantitative results for these compounds over a wide concentration range.
The methodology involves several key steps:
- Sample preparation: Filtration of the sample to remove particulates and adjustment of pH if necessary.
- Reduction of nitrate to nitrite using copper(II) sulfate in a buffered solution.
- Colorimetric reaction with a reagent that produces a measurable color change proportional to the nitrite concentration.
- Spectrophotometric measurement of the absorbance at specific wavelengths corresponding to nitrite.
The method is validated for concentrations ranging from 0.1 mg/L up to several hundred milligrams per liter, depending on the sample type and expected concentration levels. This wide range allows for comprehensive analysis across various water quality scenarios.
Industry Applications
| Sector | Application |
|---|---|
| Municipal Water Treatment Plants | Regulatory compliance and public health protection. |
| Industrial Facilities | Emission control and waste management. |
| Agricultural Runoff Systems | Water quality monitoring and pollution prevention. |
- Municipal water treatment plants use this method to ensure compliance with drinking water standards set by the EPA.
- Industrial facilities apply this test to monitor wastewater discharge and prevent non-compliance with environmental regulations.
- Agricultural runoff systems utilize this method for source water quality monitoring, helping to mitigate potential nitrogen pollution issues.
Customer Impact and Satisfaction
The ASTM D3867 method plays a critical role in ensuring the safety of drinking water and protecting public health. By accurately determining nitrate and nitrite levels, this method helps regulatory bodies enforce environmental standards and ensures that industrial processes are conducted sustainably.
Customers who utilize this service benefit from:
- Compliance with international standards such as ASTM D3867 and other relevant regulations.
- Accurate, reliable data for decision-making regarding water quality management.
- Rapid turnaround times for results, allowing for timely corrective actions if necessary.
This service enhances customer satisfaction by providing consistent and high-quality analytical support. Our team of experts ensures that every test is conducted with precision and accuracy, contributing to the overall success of our clients' operations.
