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test to detect sulphur |
| Sodium fusion extract (SFE) also called Lassaigne's extract is used to detect the presence of sulphur . Preparation of SFE A small amount of organic substance is fused with small quantity of sodium metal in a fusion tube .The red hot fusion tube is then plunged into distilled water and the contents are boiled for a few minutes ,then cooled and filtered .The filtrate obtained is called SFE or Lassaigne's extract .A few drops of sodium hydroxide solution may be cooled to make it alkaline . Test for sulphur The appearance of a deep violet colour upon addition of a few drops of sodium nitroprusside to SFE indicates the presence of sulphur . |
