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US 2015/0029506 A1Published application
Method for determining sulfur content in fibers
AssigneeE. I. Du Pont de Nemours and Company
InventorJonathan Samuel Tschritter
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Abstract
The invention concerns methods for measuring sulfur content in a fiber or polymer resin sample comprising: a) contacting the sample with a solution comprising sodium hydroxide to convert sulfur to sodium sulfate, b) combusting the sample of step a) in a furnace to remove essentially all organic materials to produce a residue; c) dissolving the residue in concentrated nitric acid; and d) determining the sulfur content of the sample using ICP Emission Spectrometry.
Claims4
A method of measuring sulfur content in a fiber or polymer resin sample comprising:
- a) contacting said sample with a solution comprising sodium hydroxide to convert said sulfur to sodium sulfate,
- b) combusting the sample of step a) in a furnace to remove essentially all organic materials to produce a residue;
- c) dissolving said residue in concentrated nitric acid;
- d) determining the sulfur content of said sample using Inductively Coupled Plasma (ICP) Emission Spectrometry.
1 more element
Dependencies are inferred from the claim text.