ASTM D6428 Test Method for Total Sulfur in Liquid Aromatic Hydrocarbons and Their Derivatives by Oxidative Combustion and Electrochemical Detection
1. Scope
1.1 This test method covers the determination of the total sulfur naturally found in liquid aromatic hydrocarbons, their derivatives and related chemicals.
1.2 This test method is applicable for samples containing sulfur from 0.05 to 100 mgS/kg.
1.3 The detector response for this technique within the scope of this test method is linear with sulfur concentration.
1.4 The following applies to all specified limits in this test method for purposes ofdetermining conformance with this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E 29.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility ofthe user ofthis standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9, and Notes 2-4 and Note 7.
2. Referenced Documents
2.1 ASTM Standards:
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D3852 Practice for Sampling and Handling Phenol and Cresylic Acid
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
2.2 Other Documents
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and 1910.1200
3. Terminology
3.1 Definitions:
3.1.1 oxidative combustion, n - process in which a sample under goes combustion in an oxygen rich environment at temperatures greater than of 650°C and compounds decompose to carbon dioxide, water, and elemental oxides.
3.1.2 quartz combustion tube devitrification, n - the suggested maximum temperature for a quartz combustion tube is 1200°C.
3.1.2.1 Discussion - Samples containing alkai-metals (elements from the Periodic Group IA (that is, sodium, potassium, etc.)) or alkaline earth (elements from the Periodic Group IIA (that is, calcium, magnesium, etc.)) will cause quartz to devitrify (that is, become milky white and brittle).
