Ammonia nitrogen electrodeIn laboratory testing, it is mainly used to quickly and accurately determine the ammonia nitrogen content in water samples. Its applications cover environmental monitoring, water quality testing, ecological protection, and industrial wastewater treatment. It has the advantages of fast detection speed, strong anti-interference ability, easy operation, and low cost. The following is an analysis of specific applications and advantages:

1、 Core application areas

1. Environmental monitoring

-Detect the concentration of ammonia nitrogen in natural water bodies (rivers, lakes, groundwater) and evaluate the degree of pollution in water sources.

-Monitor the migration of ammonia nitrogen in soil pollution investigations to provide data support for environmental remediation.

-Case: In river pollution incidents, rapid determination of ammonia nitrogen content can locate pollution sources and assess ecological risks.

2. Water quality testing

-Monitor the ammonia nitrogen in the inlet, outlet, and regenerated water of the sewage treatment plant to ensure compliance with discharge standards.

-Collaborate to detect other water quality indicators (such as pH, COD) and comprehensively evaluate the health status of water bodies.

-Advantages: No need for pre distillation, no interference from chromaticity and turbidity on the measurement, reducing sample processing steps.

3. Ecological protection

-Detect the concentration of ammonia nitrogen in fish ponds and aquaculture farms, optimize bait feeding and drug use.

-Evaluate the tolerance of aquatic organisms to ammonia nitrogen and guide the sustainable development of ecological aquaculture.

-Data support: Ammonia nitrogen concentration exceeding 1mg/L can reduce the oxygen carrying capacity of fish blood, and exceeding 3mg/L may lead to death.

4. Industrial wastewater treatment

-Real time monitoring of ammonia nitrogen content in industrial wastewater treatment process and control of nitrification/denitrification process parameters.

-Ensure that the effluent meets national standards and reduce pollution discharge costs.

-Energy saving effect: For example, WTW VARiON electrodes can save about 30% of blower power consumption.

IIAmmonia nitrogen electrodetechnical advantage

1. Fast detection speed

-Complete the measurement within 3-10 minutes, suitable for online monitoring and emergency response.

-Comparison: The colorimetric method requires waiting for a color reaction, which takes a longer time.

2. Strong anti-interference ability

-Not affected by chromaticity or turbidity, no additional compensation is required.

-Compensation mechanism: Some electrodes (such as VARiON) can eliminate interference from potassium ions, chloride ions, etc.

3. Easy to operate

-No need for complex sample pretreatment, simply add sodium hydroxide solution to adjust pH.

-Simplified steps: Sample collection → Alkali addition → Electrode measurement → Data reading.

4. Low cost

-No need for color reagents, the electrode has a long service life (up to 2 years).

-Economy: The long-term operating cost is about 50% lower than the colorimetric method.

3、 Operation process and precautions

1. Drawing of standard curve

-Measure the potential value after adding sodium hydroxide to ammonium standard solutions of 0.1, 1.0, 10, 100, and 1000 mg/L.

-Draw E-logc curve on semi logarithmic coordinate paper for subsequent sample concentration calculation.

2. Sample determination

-Take 25-30ml of water sample, add sodium hydroxide solution and stir, and read the stable potential value.

-Determine the ammonia nitrogen content (mg/L) from the standard curve.

3. Precautions

-Temperature control: The temperature of the standard solution and water sample should be consistent to avoid errors caused by overheating of the mixer.

-Acidic water sample treatment: first adjust to neutral with alkaline solution, and then add ion strength adjustment solution.

-Salt interference: High salt water samples need to add the same amount of salt to the standard solution to eliminate errors.

-Electrode maintenance: Rinse clean after use to avoid organic contamination of sensitive membranes.

4Ammonia nitrogen electrodeLimitations and Solutions

1. High concentration sample processing

-When the concentration of ammonia nitrogen exceeds the range, the sample needs to be diluted, otherwise it may damage the electrode.

-Suggestion: Choose electrodes with automatic range switching (such as 0.1-1000mg/L).

2. Effects of interfering substances

-Volatile ammonia, silver ions, and other substances may interfere with the measurement.

-Solution: Use specialized electrodes (such as VARiON NO3-HS) or preprocess the sample.

3. Electrode lifespan

-Frequent use may lead to a decrease in electrode performance.

-Maintenance suggestion: Regularly calibrate and use the IQ LabLink system to automatically input laboratory data.