It is mainly used for the determination of mercury content in coal. Samples need to be processed into an aqueous solution after chemical extraction, digestion and absorption.
Based on elemental mercury can be volatilized into mercury vapor at room temperature without heating, and has a strong absorption effect on ultraviolet rays with a wavelength of 253.7nm. 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 oxidized water sample to a bubble bottle, inserting the tube core, and adding stannous chloride at the upper entrance of the tube core to reduce the mercury ions in the water sample to Elemental mercury. An air pump uses a carrier gas (such as air) to bring the mercury vapor released from the reaction of stannous chloride and water in the bubble bottle into the colorimetric cell, and the receiver receives the light signal, and measures the mercury vapor based on the change in light intensity. concentration.
The instrument has high sensitivity, wide measuring range and good reproducibility.
Use fewer chemical reagents and fewer quantities; use fewer appliances and devices; do not use inert gases.
The special blister bottle is very simple and there is no mercury loss during operation.
The unique circuit design makes the instrument have high stability and sensitivity, and the baseline has almost no drift.
The measuring range is wide, and samples with a concentration of 0.01-100 micrograms / liter can be continuously measured in the same state .
The operation is simple, the computer prompts the entire operation process, and the intelligent data processing greatly reduces the workload of the experimenter.
Measurement range: 0 ～ 100ug / L
Detection limit: 0.003 ug / L
Relevance: R> 0.999 (0.01 ～ 10 ug / L)
Reproducibility: measured mercury standard solution , 0.04 ～ 100 ug / L, standard deviation <3%
Baseline stability: 0.00005A / 30Min
Power supply and power consumption: AC220V ± 10%, 50Hz, 40VA
Overall dimensions: 360 × 370 × 120mm Net weight: 8Kg
Meet the national standard "GB / T16659-2008 Determination of mercury in coal by cold atomic absorption spectrophotometry".