Test Kit

At present, the most commonly used method for ammonia nitrogen detection in China is the Nessler's reagent method, which is fast and stable. However, due to the presence of heavy metal mercury (Hg) in the Nessler's reagent, it is highly toxic to the environment. In addition, a large amount of alkali is added to dissolve mercury salts and iodized salts during use, making it highly corrosive. Furthermore, mercury salts and iodized salts dissolved in alkaline solutions are unstable, and after being stored for a period of time, they can easily precipitate red mercury salts due to moisture absorption, which goes against the development concept of green, intensive, and environmentally friendly advocated by the country. Another method for determining ammonia nitrogen according to national standards is the sodium salicylate method, which has no mercury salt and low alkali content, resulting in less corrosion (one twelfth of Nessler's reagent). However, the stabilization time requires one hour, which seriously restricts the application of sodium salicylate in actual water treatment.

Based on this, I consulted domestic and foreign literature to find a breakthrough in the determination of ammonia nitrogen using salicylic acid. After countless repeated experiments, the method was finally found. Inheriting the advantages of the national standard for measuring ammonia nitrogen, and shortening the reaction time to 5-18 minutes, we have found a breakthrough in the research and development of ammonia nitrogen rapid detection. Afterwards, many problems were encountered, such as simplifying steps and beautifying the market, but they were overcome one by one, and eventually the first generation of Changlong ammonia nitrogen rapid detection kit was developed. The biggest feature of the first generation product is convenience, and the entire operation process is "A+B": use a dropper (eye drops size) to add 3 drops of A reagent, then add 3 drops of B reagent, mix and react to develop color. Especially suitable for rapid diagnosis of sewage treatment stations or water plants with rudimentary equipment.

The other features of the product are summarized as follows：

1. Salt resistant, alkali resistant, low toxicity, and low corrosiveness;

2. Combined with spectrophotometry, it can also accurately detect the content of ammonia nitrogen in sewage;

3. It can be used for the detection of municipal, river, and seawater, as well as for the diagnosis of difficult to treat wastewater such as printing and dyeing, electroplating, papermaking, and leather making. It is also suitable for projects such as aquaculture and landscape water bodies that have quantitative and qualitative requirements for ammonia nitrogen.

The summary of precautions to be taken during use is as follows：

1. Try to compare colors in a well lit environment. Due to the limitations of the color chart, this method is only suitable for semi quantitative detection. When combined with a spectrophotometer, it can accurately detect water quality.

2. If high concentrations (>1.2 mg/L ammonia nitrogen) are difficult to compare colors, please dilute (see product manual for dilution method) to low concentrations (0-1.0 mg/L) before comparing colors. Through electroplating wastewater testing and dilution colorimetry, the measured concentration can reach several thousand.

3. Ammonia nitrogen reagent A is toxic, while ammonia nitrogen reagent B is corrosive. Therefore, direct contact with ammonia nitrogen reagents should be avoided during the detection process. It is best to wear protective gloves when operating. If ammonia nitrogen reagent accidentally splashes into the eyes, mouth, nose, or skin, immediately rinse with plenty of water.

4. It should be placed out of reach of children to avoid direct contact.