Chlorine salt snow melting agent concentration rapid determination and dosage control method
Snow-melting agent is a common snow-removing method in winter. Common snow-melting agents at home and abroad are generally divided into potassium acetate (organic snow-melting agent) and chloride salts according to the main components. Chloride salt snow melting agent is widely used in China because of its cheap price and obvious effect.
The snow melting principle of chloride salt snow melting agent is: after "chlorine salt" snow melting agent is dissolved in water (snow), its freezing point is below zero. Calcium is around -20 ℃, acetic acid can reach about -30 ℃. The freezing point of salt water is lower than that of water, so it is difficult to form ice cubes after the salt is dissolved in the snow water. In addition, after the snow-melting agent is dissolved in water, the concentration of ions in the water increases, so that the liquid vapor pressure of the water drops, but the solid vapor pressure of ice does not change. In order to achieve the solid-liquid vapor pressure of the ice-water mixture, the ice melts. This principle can also explain the reason why salt water is not easy to freeze. Simply put, it is the snow melting agent that lowers the melting point of snow, making it easier to melt.
When snow melting agent is used, the more it is, the better the effect. It is necessary to accurately calculate the amount of use and spread it evenly for different situations. Therefore, the developed countries prohibit the artificial spreading of snow melting agents, and require that the spreading machine be used for mechanical spreading. However, in China, the spreading of snow melting agents in most cities is entirely manual. It is impossible to achieve accurate and uniform snow melting. It is difficult to guarantee the snow melting effect and a lot of snow melting agents are wasted, which indirectly leads to its abuse.
In developed countries, the dosage of the snow-melting agent spreading equipment will be calibrated by a special testing agency to determine whether the spreading equipment can be used. It is strictly forbidden to go to the road for snow removal operations for equipment that fails to pass the calibration. China has long lacked standards for the manufacture and use of snow melting agents. It was not until 2002 that Beijing issued China ’s first local snowmelt standard, which regulated the corrosiveness and pollution of snowmelt, and at the same time issued a special “Management Measures for the Use of Snowmelt.†However, the amount of snow-melting agent in Beijing has increased year by year, from the previous 1,000 tons to 7,000 tons in 2003, and then to 30,000 tons in 2010, which is equivalent to the total amount of snow-melting agent used in the previous five years.
The concentration and amount of snow melting agent are closely related to the effect of snow melting. At the same time, the amount of snow melting agent is controlled and the concentration of salt water after melting is detected to minimize the damage to roads, bridges and soil ecology. The ATAGO chloride salt handheld rapid concentration analyzer can be quickly and easily carried around, measuring various types of chloride salts within 3 seconds, such as sodium chloride (NaCl) PAL-03S (sodium chloride concentration meter), calcium chloride (CaCl2) PAL-41S (calcium chloride concentration meter), magnesium chloride (MgCl2) concentration PAL-43S (magnesium chloride concentration meter).
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