1 Scope
1.1 This standard covers the determination of total sulfur in liquid hydrocarbons, boiling in the range from approximately 25 °C to 400 °C, with viscosities between approximately 0.2 mm2/s and 10 mm2/s at room temperature. This standard is applicable to naphtha, distillates, engine fuel and other oil products containing 1.0 mg/kg ~ 8,000 mg/kg total sulfur.
1.2 This standard is applicable for total sulfur determination in liquid hydrocarbons containing less than 0.35 % (m/m) halogen(s).
1.3 The values stated in SI (International System of Units) units are to be regarded as standard.
1.4 This standard involves some dangerous materials, operations and equipment, but it does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and protection practices and determine the applicability of regulatory limitations prior to use.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. Unless otherwise specified in the standard, the following normative references shall be the current and valid.
GB/T 4756 Method for manual sampling of petroleum liquids
3 Summary of test method
A hydrocarbon sample is directly injected in a cracking tube or a sample boat. The sample is inserted by the syringe drive into a high temperature combustion tube where the sulfur is oxidized to sulfur dioxide (SO2) in an oxygen rich atmosphere. Water produced during the sample combustion is removed and the sample combustion gases are next exposed to ultraviolet (UV) light. The SO2 absorbs the energy from the UV light and is converted to excited sulfur dioxide (SO2*). The fluorescence emitted from the excited SO2* as it returns to a stable state, SO2, is detected by a photomultiplier tube and the resulting signal is a measure of the sulfur contained in the sample.
Warning: Exposure to excessive quantities of ultraviolet (UV) light is injurious to health. The operator must avoid exposing any part of their person, especially their eyes, not only to direct UV light but also to secondary or scattered radiation that is present.
Foreword i
1 Scope
2 Normative references
3 Summary of test method
4 Significance and use
5 Instruments
6 Reagents and materials
7 Safety precautions
8 Sampling
9 Preparation of instruments
10 Calibration
11 Procedures
12 Calculation
13 Precision and bias
