Measurement principle:

The measurement of HONO concentration in the atmosphere is carried out usingWet chemical methodThe basic principle is to use an absorbing liquid and utilize the diffusion between gas and liquid to convert HONO in the sampled gas into nitrite (NO2-), which is then measured using dual channel long path absorption spectroscopy (LOPAP). Long path absorption spectroscopy (LOPAP) is a widely used wet chemical method for measuring the concentration of gaseous nitrous acid in both laboratory research and field observations.

Product Features:

a、The classic wet chemistry method has a lower detection rate compared to optical methods, reaching up to 2ppt;

b、 Dual channel measurement (dual fiber pool and dual spectrometer dual channel measurement),Measure the total sum of HONO and interfering substances along the way, and measure interfering substances along the way to ensure the accuracy and stability of the measurement results；

c、 Full process quality control setting, which can achieve full process quality control from HONO absorption to calibration;

d、 Absorption using neutral non corrosive solution:Currently, most LOPAP devices use a mixture of sulfonamide and hydrochloric acid as the absorption solution,PHIn0During the process of gas-liquid mixing, significant damage is caused to the vacuum pump. In addition, the high acidity of the waste liquid makes it difficult to handle and has an impact on the environment.

dAutomatic degassing system:Effectively removing bubbles from the pipeline is an important factor in the normal operation of the instrument, avoiding interference from bubbles and ensuring the effectiveness of real-time concentration output. At present, LOPAP generally does not have a device for removing bubbles, which can be affected by bubbles.