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1. Bingbing Bi
   Posted 13/9/2023, 07:43

   Hydrogen Sulphide Generation Sites:
   
   1）Chemical Industry
   The production and manufacture of sulphur-containing compounds such as parathion, ethion, phosmet, sulfanilamide, etc.; petrochemicals, coal chemical industry, natural gas chemical industry, rubber vulcanisation process, etc. can produce hydrogen sulphide.
   
   2）Oil Extraction
   In the process of drilling and extracting oil, a large amount of hydrogen sulphide can be spewed out due to impurity sulphur in the oil.
   
   3）Tanning, Monosodium Glutamate
   Tanning leather with sodium sulfide hair removal, the production of monosodium glutamate with sodium sulfide in addition to iron, can produce hydrogen sulfide.
   
   (4) Paper, Sugar, Food Processing Industry
   With plants and animals as raw materials for some of the production process, due to the fermentation and corruption of organic matter can produce hydrogen sulfide.
   
   (5) Mining, Smelting Industry
   All kinds of ores contain impurity sulfur, mining and smelting process can have a large amount of hydrogen sulfide; purification of certain metals with hydrogen sulfide, the generation of its insoluble sulfide, there is also hydrogen sulfide.
   
   6) Fishing Industry
   Fish in the cabin can produce hydrogen sulfide after corruption, poor ventilation can easily lead to poisoning.
   
   (7) Sewage Pipe and Well Operation
   Cleaning of pickling pols, sewers, sewage drains, septic tanks, rubbish piles can often be exposed to high concentrations of hydrogen sulphide.
   
   8）Chemical Cleaning Operations
   Cleaning operations using sulfur-containing cleaning agents, devices, containers, pipelines, heat exchangers, etc., the material and scale containing sulfur and sulfur compounds, under certain conditions will produce hydrogen sulfide gas.
   
   Hydrogen sulphide is produced from the decomposition of proteins and some chemical reactions. It is a weakly acidic, water-soluble substance that can be dissolved in water, burned or precipitated. Hydrogen sulphide is easily ignited under normal conditions. When the concentration of hydrogen sulphide is very low, it gives off a rotten egg odour. When the concentration is high, the odour disappears as the olfactory system is paralysed.
   
   Hydrogen sulphide is a very powerful neurotoxin. When a person inhales too much of it, it can irritate the mucous membranes and cause poisoning. Mild poisoning may cause symptoms such as tearing, red eyes and dizziness. Severe cases may lead to consequences such as neurasthenia and vegetative nerve disorders. It can be said that the toxin contained in hydrogen sulphide is very strong.
   
   Hydrogen sulphide is also a flammable and explosive chemical that forms explosive mixtures when mixed with air. When exposed to open flames or high temperatures, it can cause combustion and explosion.
   
   The hazardous threshold concentration of hydrogen sulphide is 150mg/m3 (100ppm), at which concentration it can have irreversible or delayed effects on life and health.
   
   Two other safety regulations for hydrogen sulphide gas:
   Threshold Limit Value (TLV): the maximum concentration of a toxic substance in air at which long-term exposure of almost all workers will have no adverse effect. The threshold limit value for hydrogen sulphide is 15 mg/m3 (10 ppm)
   Safe threshold concentration: the maximum concentration of hydrogen sulphide that is acceptable for workers to work safely in the open air for 8h is 30mg/m3 (20ppm).
   Hydrogen Sulphide Detector Alarm Setting
   
   The hydrogen sulphide detector can be divided into three levels to set the concentration alarm value:
   
   First level alarm 1/2 TLV=5ppm
   Secondary Alarm 1TLV=10ppm
   Tertiary alarm 2TLV=20ppm
   When the work environment is dense artificial, air flow in general, you need to set a level of alarm, air circulation is better, less flow of people will not cause major accidents can be set accordingly for the second level of alarm, when the environment is sparsely populated places in the countryside, can also be set for the third level of alarm.
   
   At this time, the installation of H2S sensor is particularly important to ensure the safety of the construction site and construction personnel's lives and health.

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