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Absorption liquid for collecting gas-phase arsenic with different valence states

A technology of absorbing liquid and gas phase, applied in the field of absorbing liquid, can solve the problems of arsenic form transformation, low arsenic concentration, and small sampling volume, etc., and achieve the effect of preventing trivalent arsenic from being oxidized and having low oxidizing property.

Inactive Publication Date: 2020-05-12
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN107167347A discloses a portable gas sampling bag, but because the sampling volume of the gas sampling bag is limited, and the concentration of arsenic in the gas is usually very low, the sampling amount is extremely small and cannot be detected
my country's current national standard test method for stationary source pollutant emissions is "Measurement of Particulate Matter in Exhaust from Stationary Pollution Sources and Sampling of Gaseous Pollutants" (GB / T16157-1996). This method does not take into account the transformation of arsenic forms in sampling, so It is only suitable for the collection of total arsenic, but cannot collect the content of arsenic in different valence states in flue gas

Method used

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  • Absorption liquid for collecting gas-phase arsenic with different valence states
  • Absorption liquid for collecting gas-phase arsenic with different valence states
  • Absorption liquid for collecting gas-phase arsenic with different valence states

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Prepare 150 mL of absorbing solution containing 0.5 mol / L hydrochloric acid, 0.1 mol / L oxalic acid, and 0.3 mol / L ascorbic acid, named as absorbing solution 1. Prepare 150 mL of absorption solution containing 1 mol / L hydrochloric acid, 0.1 mol / L oxalic acid, and 0.3 mol / L ascorbic acid, named as absorption solution 2. Prepare 150 mL of absorption solution containing 5% volume fraction nitric acid and 10% volume fraction hydrogen peroxide, named absorption solution 3.

[0011] Pour the above-mentioned absorption liquids into 250mL absorption bottles of the same type, respectively, and pass 200mL / min of simulated flue gas containing a certain concentration of gas-phase arsenic into the absorption bottles respectively, and the simulated flue gas contains 5% volume fraction of oxygen, and the rest are Nitrogen. The ventilation time was 30 minutes. After the experiment, the arsenic content in the absorption solution was determined.

[0012] Each group of experiments was r...

Embodiment 2

[0017] Three kinds of absorbing liquids identical to those in Example 1 were prepared and named as absorbing liquids 4, 5, and 6, respectively.

[0018] Pour the above-mentioned absorption liquids into 250mL absorption bottles of the same type, respectively, and pass 300mL / min of simulated flue gas containing a certain concentration of gas-phase arsenic into the absorption bottles respectively. The simulated flue gas contains 5% volume fraction of oxygen, and the rest are Nitrogen. The ventilation time was 30 minutes. After the experiment, the arsenic content in the absorption solution was determined.

[0019] Each group of experiments was repeated three times, and the test results are shown in Table 2.

[0020] Table 2 Test results of Example 2

[0021]

[0022]

[0023] As can be seen from Table 2, under the experimental conditions, when the concentration of hydrochloric acid in the absorption solution is 0.5 mol / L, the absorption effect is poor. When the concentra...

Embodiment 3

[0025] Configure 150mL with 1ppmAs 3+ , 1 mol / L hydrochloric acid, 0.1 mol / L oxalic acid, 0.3 mol / L ascorbic acid absorption solution, named as absorption solution 7. Configure 150mL with 1ppmAs 3+ , 1 mol / L hydrochloric acid, 0.1 mol / L oxalic acid, 0.5 mol / L ascorbic acid absorption solution, named as absorption solution 8.

[0026] Pour the above-mentioned absorption liquids into 250mL absorption bottles of the same type, respectively, and feed 300mL / min of simulated flue gas into the absorption bottles. The simulated flue gas contains 20% volume fraction of oxygen and the rest is nitrogen. The ventilation time was 30 minutes. After the experiment, the content of different valence arsenic in the absorption solution was determined.

[0027] Each group of experiments was repeated three times, and the test results are shown in Table 3.

[0028] Table 3 Test results of Example 3

[0029]

[0030] It can be seen from Table 3 that under the experimental conditions, when th...

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Abstract

The invention discloses an absorption liquid for collecting gas-phase arsenic in different valence states. The absorption liquid contains an acid and an antioxidant. The acid is hydrochloric acid andoxalic acid; and the antioxidant is ascorbic acid. The concentration of hydrochloric acid in the absorption liquid is 0.5-2 mol / L; the concentration of oxalic acid in the absorption liquid is 0.05-0.2mol / L; and the concentration of ascorbic acid in the absorption liquid is 0.1-0.5 mol / L. The absorption liquid is high in absorption efficiency and low in oxidability, ascorbic acid in the absorptionliquid can prevent trivalent arsenic from being oxidized in the sampling process, and the absorption liquid can be used for collecting gas-phase arsenic pollutants in different valence states.

Description

technical field [0001] The invention belongs to the field of pollutant sampling, and more particularly relates to an absorbing liquid for collecting gas-phase arsenic in different valence states. Background technique [0002] Arsenic is one of the most carcinogenic and harmful substances in the natural environment. The toxicity of arsenic depends not only on its content, but also on its form. The arsenic in the flue gas generated by fuel incineration mainly exists in the inorganic form, and the arsenic in the flue gas will be directly discharged into the atmosphere with the flue gas, while the 3+ is much more toxic than As 5+ . Accurate analysis of the total content of arsenic in flue gas and arsenic in different valence states can reasonably evaluate the harm of arsenic in flue gas, so it has important research value and practical significance. [0003] CN107167347A discloses a portable gas sampling bag, but the sampling volume of the gas sampling bag is limited, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14G01N1/22
CPCB01D53/18B01D53/1493G01N1/2258G01N1/2214G01N2001/2217B01D2252/10B01D2252/60B01D2257/55B01D2258/0283
Inventor 张月王春波刘翔王栋陈艳丽
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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