According to the standard:
Conforms to the national standard "GB / T16659-2008 Determination of mercury in coal by cold atomic absorption spectrophotometry".
The main purpose:
It is mainly used for the determination of mercury in coal. Samples need to be processed by chemical extraction, digestion, absorption, etc. into an aqueous solution.
Measuring principle:
Based on elemental mercury at room temperature, without heating, it can be volatilized into mercury vapor, and has a strong absorption effect on the ultraviolet ray with a wavelength of 253.7 nm. In a certain range, the concentration of mercury is proportional to the absorption value, which is in line with Bill. law. Applying the principle of cold atomic absorption, using Lambert-Beer's Law, adding an oxidizing water sample to the infusion bottle, inserting the die, adding stannous chloride at the entrance of the upper part of the die, and reducing the mercury ions in the water sample into Elemental mercury. The suction pump uses a carrier gas (such as air, etc.) to bring the mercury vapor evolved from the stannous chloride reacting with the water sample into the colorimetric cell. The receiver receives the light signal and determines the mercury vapor according to the change of the light intensity. concentration.