Methods for detecting carbon monoxide, methods for testing carbon monoxide

1. See if it can be burned; 2. When combusting, the flame is covered with a dry beaker 1 to prove that it is generated without water. (excluding the interference of other gaseous organic compounds) 3. The gas generated by combustion passes into the clear lime aqueous solution, and white precipitates are generated, then the combustion product is carbon dioxide, and the original gas is carbon monoxide.

Carbon monoxide, a carbon oxide, has the chemical formula CO and molecular weight, and is usually a colorless, odorless, and tasteless gas. In terms of physical properties, the melting point of carbon monoxide is -205, the boiling point is, and it is insoluble in water (20 when the solubility in water is, it is not easy to liquefy and solidify.

In terms of chemical properties, carbon monoxide is both reductive and oxidizing, and can undergo oxidation reactions (combustion reactions) and disproportionation reactions. At the same time, it is toxic, and at higher concentrations, it can cause people to have different degrees of poisoning symptoms, endangering the brain, heart, liver, kidney, lungs and other tissues of the human body, and even electrocution-like death, and the minimum lethal concentration of human inhalation is 5000ppm (5 minutes). Industrially, carbon monoxide is the basis of one-carbon chemistry, which can be prepared by methods such as coke oxygen method, and is mainly used for the production of methanol and phosgene and organic synthesis.

1. See if it can be burned;

2. When combusting, the flame is covered with a dry beaker 1 to prove that it is generated without water. (excludes interference from other gaseous organic compounds).

3. The gas generated by combustion passes into the clarified lime water-soluble liquor, and there is a white precipitate to form, then the combustion product is carbon dioxide, and the original gas is carbon monoxide.

The valency of the carbon element in the carbon monoxide molecule is +2, which can be further oxidized to +4 valence, so that carbon monoxide is flammable and reducible, and carbon monoxide can be burned in air or oxygen to produce carbon dioxide. Chemical Equation:

When burned, it emits a blue flame and emits a large amount of heat. Therefore, carbon monoxide can be used as a gaseous fuel.

The laboratory generally uses concentrated sulfuric acid to catalyze or heat oxalic acid decomposition and remove carbon dioxide with sodium hydroxide to prepare carbon monoxide, the specific reaction is as follows:

Carbon monoxide is used as a reducing agent, which can slowly reduce many metal oxides into metal elements at high temperature or when heated, so it is often used in metal smelting.

1.Whether bad reputation can be burned.

2.When burning, the flame is covered with a dry beaker 1. Proves that it is anhydrous and generated. (excluding the interference of other gaseous organic compounds) is a suspicious type.

3.The gas generated by combustion passes into the clear lime aqueous solution, and there is a white precipitate to form Qinchai, and the combustion product is carbon dioxide. The original gas is carbon monoxide.

1. Carboxyhemoglobin: Carboxyhemoglobin is the gold standard for diagnosing acute carbon monoxide poisoning, and carbon monoxide poisoning is considered for carboxyhemoglobin detection of more than 10%. However, clinically, due to the rapid dissociation of carboxyhemoglobin, it is necessary to combine the reference exposure history and the concentration of carbon monoxide in the poisoning environment because it is too long out of the toxic environment or may make the test results in the normal range.

2. Electroencephalography: EEG is a non-specific examination, mild carbon monoxide poisoning can be seen as a local slow wave increase, and the EEG of moderate to severe patients is mainly manifested as diffuse low-amplitude slow waves, showing extensive moderate or severe abnormalities, which is parallel to the progression of hypoxic encephalopathy.

3. Head CT: Mild to moderate patients with head CT can be abnormal, patients with severe carbon monoxide poisoning show signs of cerebral edema, shallow and full fission of the sulcus gyrus, bilateral pale symmetrical hypodensity, diffuse hypodensity of cerebral white matter, and unclear demarcation of gray and white matter. In addition, CT of the head can help distinguish it from other intracranial conditions.

4. Serum enzymatic examination: phosphocreatine kinase (CPK), lactate dehydrogenase (LDH), aspartate aminotransferase (AST), alanine aminotransferase (ALT) in serum are abnormally increased in acute carbon monoxide poisoning, and the environmental exposure history is not clear, and the combination of enzymology and blood gas analysis is an important laboratory index for diagnosing poisoning when differential diagnosis is difficult.

5. Blood gas analysis: patients with carbon monoxide poisoning mostly present with hypoxemia and acid-base metabolism imbalance, which is of great significance for the evaluation of the severity and effect of carbon monoxide poisoning.

In China, the Hygienic Standards for the Design of Industrial Enterprises (TJ36-1979), issued on September 30, 1979 and implemented on November 1, 1979 and repealed on December 1, 1998, set out the requirements for the maximum allowable concentrations of harmful substances in the atmosphere in residential areas.

Requirements: the maximum allowable concentration of harmful substances in the atmosphere in residential areas of China (TJ36-79); daily average). The highest tolerable level is 50*10 -6g m3.

China stipulates that the maximum allowable concentration of carbon monoxide in the air in the workshop is 30mg m3.