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Lab Methods

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Doctor Test

  • Method ASTM D4952
  • Repeatability None Established
  • Reproducibility None Established
  • Blending non-linear
  • Additive Correction No

The purpose of this test isas a quick detection of mercaptans, hydrogen sulfide, and/or elemental sulfur contained in the product. The presence of these compounds can lead to the deterioration of materials used in the transportation, storage, and consumption. They can also be a safety issue when H2S is present.

The method is performed by mixing the product with a Sodium Plumbite solution in a test tube and adding free sulfur. The tube is then shaken to see if the mixture reacts. If there is a color change present then the presence of one of these compounds is assumed to be present in the sample.