Chlorine gas detector_chlorine detection method

Chlorine is an important industrial raw material. Many chemical components contain chlorine. For example, disinfectants commonly used in drinking water disinfection, certain drugs, chemical fibers or plastics require chlorine as a raw material. No matter how strong your body is, inhaling excessive amounts of chlorine can cause respiratory damage. In severe cases, it can cause acute pulmonary edema. Improper rescue may result in suffocation and death. But the danger of chlorine should also be preventable.

Chlorine gas detector working principle: Electrochemical principle The working mode of the sensor is to detect a certain amount of gas diffusion. Provides the best personal gas detection, reliable performance, easy to use, and rugged. The sturdy engineering plastic case can withstand the possibility of drop collisions in the field; the large-screen LCD display is easy to view; compact and lightweight, it can be easily caught in pockets, belts or helmets.

1. Measurement range: 0-100ppm;

2, detection principle: electrochemical;

3. Detection gas: chlorine gas;

4. Display: high contrast digital display, high brightness LED indicator and buzzer alarm;

5, safety level: CSA certification; sensor life: 2 years;

6, battery life: 18 months (no alarm);

7, size and weight: 93 & TImes; 43 & TImes; 28 (mm), 156g;

1, simple method: first look at the color if it is yellow-green, then use the wet starch KI test paper close, if the test paper turns blue, it is Cl2.

2. If the amount of gas is large enough to show yellow-green color, the wet red cloth strip can be inserted into the gas. If the color fade is observed, the gas can be determined as chlorine gas according to the color and fading. If the color is lighter or even the color is not visible, the identification method and the wet starch potassium iodide are meaningless. The reason is that the blue color of the test paper utilizes the strong oxidizing property of chlorine gas, and there are many gases having this property, and the gas color is unknown. This operation is meaningless, while the wet colored cloth strip uses chlorine gas to form hypochlorous acid to achieve the bleaching effect. It is also described above. If yellow-green color is not seen, other gases may still have bleaching and fading.

3, the amount of gas is small, can not observe the yellow-green, then we can only use the gas into the silver nitrate solution, observe whether the solution first becomes a white precipitate that produces insoluble and dilute nitric acid, to determine, However, this method is not without loopholes. If the gas is SO2, the white precipitate is easily oxidized by dilute nitric acid to become slightly soluble silver sulfate.

Based on the above two considerations, Xiaobian believes that a more appropriate method for identifying chlorine gas is to pass the gas into a small amount of purple litmus test solution. It can be observed that the color first turns red, and then fades, which proves that the gas has dissolved in water. Acidity and bleaching property, and then, the acidified silver nitrate solution was dropped into the solution, and it was confirmed that there was an insoluble white precipitate, which was confirmed to be chlorine gas. This method avoided SO2 because the SO2 has bleaching properties, but Its bleaching ability is limited, it can not make the litmus fade, and after the formation of hypochlorous acid, the strong oxidation can be done. The last step of silver nitrate verifies that the gas contains chlorine, and the two-step consideration should be chlorine.

NO2, N2O4, in a state of dynamic equilibrium 2NO2==N2O4. N2O4 is a colorless or yellow gas at room temperature, has a pungent odor, can be dissolved in water to form nitric acid and nitrous acid, is highly corrosive, and has a maximum allowable concentration of 5 ppm in air. Relative density: 1.419 (°C) Melting point: -9.3 °C ( Liquid) Boiling point: 21 ° C (decomposition).

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