COD ammonia nitrogen detector

NegotiableUpdate on 12/30

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Overview

COD ammonia nitrogen detector is an instrument used for rapid detection of ammonia nitrogen values in water. Ammonia nitrogen in the form of free ammonia or ammonium ions reacts with Nessler's reagent to form a light yellow brown complex. The absorbance of the complex is directly proportional to the ammonia nitrogen content. The ammonia nitrogen content is directly displayed by colorimetric method and calculated by microcomputer chip. The experimental water required for the testing process of the tester is ammonia free water. The preparation of ammonia free water usually includes the following methods: ion exchange method, distillation method, and water purification method. Due to the high procurement cost of water purifiers, the laboratory can use ion exchange or distillation methods to prepare ammonia free water.

Product Details

　　COD ammonia nitrogen detectorIt is an instrument and equipment used for rapid detection of ammonia nitrogen in water. Ammonia nitrogen in the form of free ammonia or ammonium ions reacts with Nessler's reagent to form a light yellow brown complex. The absorbance of the complex is directly proportional to the ammonia nitrogen content. The ammonia nitrogen content is directly displayed by colorimetric method and calculated by microcomputer chip. The experimental water required for the testing process of the tester is ammonia free water. The preparation of ammonia free water usually includes the following methods: ion exchange method, distillation method, and water purification method. Due to the high procurement cost of water purifiers, the laboratory can use ion exchange or distillation methods to prepare ammonia free water.

COD氨氮检测仪

　　COD ammonia nitrogen detectorSeveral requirements for water sample treatment:

1. The collected samples should be placed into polyethylene or glass bottles for analysis as soon as possible. If storage is required, sulfuric acid should be added to adjust the pH to<2. Cold storage at 2-5 ℃ can store for 7 days;

2. When the water sample contains suspended solids, residual chlorine, metal ions such as calcium and magnesium, sulfides, and organic matter, interference will occur. When containing such substances, appropriate treatment should be carried out to eliminate their impact on the measurement;

3. If there is residual chlorine in the sample, add an appropriate amountsulfurRemove sodium sulfate solution and use starch potassium iodide test paper to check if residual chlorine has been removed;

4. Adding an appropriate amount of potassium sodium tartrate solution during color development can eliminate the interference of metal ions such as calcium and magnesium;

5. If the water sample is turbid or colored, pre distillation or flocculation sedimentation can be used for treatment.

So what kind of environment can meet it?

1. In the laboratory environment, there should be no dust or ammonium compounds in the testing laboratory. It is not suitable to conduct analysis projects such as nitrate nitrogen simultaneously. Because the nitrate nitrogen test requires the use of ammonia, which is highly volatile, the Nessler reagent will absorb ammonia from the atmosphere, resulting in higher test results. The reagents and glassware used in the test should be stored separately to avoid contamination and affect the vacancy value.

2. The experimental process has high requirements for water. Ordinary distilled water often fails to meet the implementation requirements and requires secondary treatment to obtain ammonia free water. Based on practical work experience, when distilling to prepare ammonia free water, the first half of the distillate and the second half of the distillate are discarded, and only the middle part is taken and stored in a sealed glass bottle. This reduces the vacancy value of ammonia free water, but secondary processing is laborious and uneconomical. A new type of deionized water prepared using a composite resin activated carbon column was used instead of ammonia free water to measure ammonia nitrogen, and the vacant absorbance met the implementation requirements.