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In the 1940s, the analysis of amino acids was primarily conducted through paper chromatography and ion exchange chromatography techniques. Paper chromatography allowed the separation of amino acids based on their solubility in specific solvents, by spotting a sample onto chromatography paper and allowing a solvent to move through the paper by capillary action. The amino acids would then separate and could be identified based on their specific positions or Rf values. Ion exchange chromatography utilized a column filled with a charged resin, which would attract and bind amino acids based on their charge. By changing the pH or ionic strength of the eluting solution, individual amino acids could be selectively released and identified. These early techniques were foundational but had limitations in sensitivity and specificity compared to modern methods such as mass spectrometry.
Phosphine (PH3) is a colorless, flammable, and toxic gas known for its use as a fumigant. Polyethylene, a widely used polymer, is known for its chemical resistance, which includes resistance to many acids and bases. However, the interaction between phosphine and polyethylene isn't straightforward. Under normal conditions, phosphine does not react with polyethylene due to the stability and inert nature of the polymer. Polyethylene consists of long chains of ethylene (CH2=CH2) units, which are saturated and resist reactions with non-radical species at normal temperatures and pressures.
However, in the presence of UV light, high temperatures, or catalytic conditions, polyethylene can undergo oxidation or other chemical modifications. Phosphine could potentially interact with polyethylene under extreme conditions, such as high temperatures or in the presence of radical initiators, but this would not be a direct reaction with the polymer in its usual state, rather a degradation of the polymer which might indirectly involve phosphine.
In practical applications, polyethylene containers are often used for storing phosphine gas or solutions because of their chemical compatibility, indicating that under normal storage and handling conditions, phosphine does not react with polyethylene.
PVC, or Polyvinyl Chloride, is commonly used in pipes and plumbing because of its durability and resistance to chemicals. However, its resistance to grease and oils is somewhat limited. Over time, exposure to grease can lead to the softening and degradation of PVC materials. This happens because certain components in greases and oils can act as plasticizers to PVC, reducing its mechanical strength. In plumbing, where PVC pipes are often used, it's generally advised to limit the amount of grease disposed of down drains to prevent clogging and to avoid damage to the PVC pipes over time. For industrial applications where contact with grease is expected, alternatives like CPVC (Chlorinated Polyvinylene Chloride) may be recommended due to its enhanced chemical resistance.
PVC, or Polyvinyl Chloride, is commonly used in pipes and plumbing because of its durability and resistance to chemicals. However, its resistance to grease and oils is somewhat limited. Over time, exposure to grease can lead to the softening and degradation of PVC materials. This happens because certain components in greases and oils can act as plasticizers to PVC, reducing its mechanical strength. In plumbing, where PVC pipes are often used, it's generally advised to limit the amount of grease disposed of down drains to prevent clogging and to avoid damage to the PVC pipes over time. For industrial applications where contact with grease is expected, alternatives like CPVC (Chlorinated Polyvinylene Chloride) may be recommended due to its enhanced chemical resistance.
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