Sulfhidric acid

Sulfhydric Acid. It is a product resulting from the aqueous solution of hydrogen sulfate, represented by the chemical formula H 2 S, found both in liquid and gas form (in this case it is called sulfhydric gas), highly toxic and flammable, irritant, burns easily producing enxofre dioxide (SO 2 ).

Summary

[ hide ]

  • 1 Toxic effects
  • 2 Natural State
    • 1 H 2S concentrations
  • 3 Chemical properties
  • 4 External links
  • 5 Sources

Toxic effects

In high concentrations, hydrogen sulfide (H 2 S) can become one of the most deadly silent enemies on the planet. Its toxic effect inhibits the function of the olfactory nerve and the person is practically unable to smell the characteristic stench of this chemical compound, therefore its early detection by this means is almost impossible. In addition, it has the particularity of knocking out the exposed person, since after a few inhalations, the toxic effect of this gas leaves the cells without energy, the individual faints, the muscles stop working and the heart paralyzes. generating a cardiorespiratory arrest and the generalized collapse of the organism.

Dr. María Fernanda Cavieres, an expert in toxicology at the Faculty of Pharmacy of the University of Valparaíso and vice president of the Society of Toxicology of Chile (Sotox), was precise when explaining how hydrogen sulfide acts in the body.

“When the gas is in high concentrations, the person is practically unable to smell. Therefore, it cannot have that defense mechanism of starting from the place of risk, in this case where the escape was. One of the characteristics of hydrogen sulfide is to have an unpleasant stench, like decomposing organic matter, which can only be felt in low concentrations ”, he clarified.

The toxicology expert added that for this reason, by not realizing the imminent risk to which the individual is subjected, he remains in the highly contaminated place, breathing high concentrations of the gas. “Then comes the toxic effect. One of the manifestations that is very characteristic of hydrogen sulfide poisoning is the feeling of fainting, the collapse of the person. That is why this molecule is described as ‘the knockout gas’; that is to say, the individual is completely adrift, unconscious, product of the toxicity that the gas is exerting on him ”.

2 S is a volatile compound, that is, it is found in the air we breathe, because it tends to be in the gaseous phase. This gas is naturally found in oil, natural gas, volcanic gases, and hot springs. It can also exist in stagnant or swampy waters, drains, and sewers, for example.

Dr. Cavieres explains that it is a very toxic gas. Its mechanism of action is that it leaves cells without energy, “therefore, the body in general does not have the necessary strength to function and the most frequent way of dying of people who have been intoxicated with hydrogen sulfide gas it is a cardiorespiratory arrest. For this reason, as there is no energy for the muscles to contract, the heart can no longer beat and the person dies ”. The associated consequences of those who were exposed to the gas, but managed to escape a fatal outcome, will depend on how long they were in the place and the concentration levels that were in the affected area, among other variables, but in general “the consequences are related to neurotoxic effects, such as memory loss,

Natural state

Hydrogen sulfide (H 2 S) is the most poisonous of the natural gases; occurs during biological and industrial processes; it is 6 times more lethal than Carbon Monoxide and half as lethal as Hydrogen Cyanide . When it appears as a free gas is when it is most dangerous.

2 S is found throughout the world in different concentrations associated with gas, oil, and water . It is found in porous formations and can be discovered by our staff during the assembly of equipment for drilling and production logging operations in oil or gas wells. It is especially found during sampling operations, and during drilling operations due to gas cut mud or accidental blowout or mishap during operations.

It should be noted that sulfurous crude oil contains H 2 S which will be released when the pressure is reduced. These pressure reductions occur during oil production, sample chamber transfers, and during leaks. H2S also appears in drilling mud due to decomposition of organic additives at high temperatures. Likewise, H 2 S is found in drain and sink environments.

Particular areas where high concentrations of this element are known to exist are in Canada, parts of the United States of America , including Texas , Louisiana , Mississippi, and Florida . It is also found in the Middle East , especially in an area that goes from Oman through and reaching Turkey , the Far East, Europe and North Africa .

2 S concentrations

When treating H 2 S it is possible to use different units to measure its concentration, the standard is ppm – parts per million for gas concentrations.

Chemical properties

  1. It is extremely toxic (almost as toxic as Hydrogen Cyanide) and 5 to 6 times as toxic as Carbon Monoxide. B. Colorless. C. Disgusting odor, often described as the smell of rotten eggs. D. Forms an explosive mixture with a concentration between 4.3 and 46 percent by volume. This constitutes an extremely wide range. Spontaneous combustion occurs at 500 ° F (260 ° C). This is a very low ignition temperature, since an unsmoked cigarette butt is at 450 ° F and increases its temperature to over 500 ° F when smoked. Vapors can travel a considerable distance to a source of ignition and then flash back. E. Burns with a blue flame and produces Anhydrous Sulfur (SO2), which is less toxic than Hydrogen Sulfide but is very irritating to the eyes and lungs and can cause serious damage. F. It is heavier than air – its specific gravity is 1,189 (that of air is = 1,000) at 60 ° F and 14.7 psi. Therefore, H2S accumulates in low spots such as the basements of wells. G. It is soluble both in water (4 volumes of gas in 1 volume of water at 0 ° C) and in liquid hydrocarbons. H. Produces irritation to the eyes, throat and respiratory system. I. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without respiratory protection equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. It is heavier than air – its specific gravity is 1,189 (that of air is = 1,000) at 60 ° F and 14.7 psi. Therefore, H2S accumulates in low spots such as the basements of wells. G. It is soluble both in water (4 volumes of gas in 1 volume of water at 0 ° C) and in liquid hydrocarbons. H. Produces irritation to the eyes, throat and respiratory system. I. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without respiratory protection equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. It is heavier than air – its specific gravity is 1,189 (that of air is = 1,000) at 60 ° F and 14.7 psi. Therefore, H2S accumulates in low spots such as the basements of wells. G. It is soluble both in water (4 volumes of gas in 1 volume of water at 0 ° C) and in liquid hydrocarbons. H. Produces irritation to the eyes, throat and respiratory system. I. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without respiratory protection equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. H2S collects in low spots such as well cellars. G. It is soluble both in water (4 volumes of gas in 1 volume of water at 0 ° C) and in liquid hydrocarbons. H. Produces irritation to the eyes, throat and respiratory system. I. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without respiratory protection equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. H2S collects in low spots such as well cellars. G. It is soluble both in water (4 volumes of gas in 1 volume of water at 0 ° C) and in liquid hydrocarbons. H. Produces irritation to the eyes, throat and respiratory system. I. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without respiratory protection equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without protective respiratory equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C. The Minimum Concentration Limit Value (TLV) is a maximum of 8 hours of exposure without protective respiratory equipment – 10 ppm. J. It is corrosive to all metals of the electrochemical series. K. Its boiling point is -79 ° F, -62 ° CL Its melting point is -177 ° F, -116 ° C.

 

 

Leave a Comment