Agilent 355SULFUR Manuals

This document describes the analysis of liquefied petroleum gases according to ASTM D 5504-95. It utilizes gas chromatography with sulfur chemiluminescence detection to identify and quantify sulfur compounds in petroleum feeds and products, including liquefied petroleum gases (LPGs) and natural gas liquids (NGLs). Sulfur compounds can have corrosive effects, inhibit or destroy catalysts in downstream processing, and introduce undesirable properties to products. However, certain odorous sulfur compounds like ethyl mercaptan, tetrahydrothiophene, and occasionally thiophane are intentionally added to propane as warning agents for detecting LPG leaks. The ability to speciate sulfur compounds in these liquids is useful for quality assurance of odorant addition and better control of sulfur compounds in finished products.

The copper strip corrosion test is commonly used as a product specification for liquid petroleum gases (LPGs). The test is designed to detect the presence of components that may be corrosive to copper and copper-alloy fittings that come into contact with the product. While the test is very simple to perform, its interpretation can be subjective. Furthermore, the test can produce erroneous results and it does not indicate the actual cause of corrosion, although it is generally assumed to be due to sulfur compounds. Some situations where copper strip corrosion does not perform satisfactorily are as follows. While the presence of carbonyl sulfide does not cause corrosion in LPG systems, corrosive hydrogen sulfide is formed upon hydrolysis of carbonyl sulfide. Thus, an LPG could pass the copper strip corrosion test at its point of production and yet fail at its point of delivery or simply upon storage for a few days. Different LPGs may each pass the copper strip corrosion test, but when commingled could fail. This occurs because of hydrolysis as described or because one could contain a low level of hydrogen sulfide and the other could contain a low level of elemental sulfur. Hydrogen sulfide and elemental sulfur are known to have a synergistic effect on corrosivity. An LPG product could contain corrosive amounts of hydrogen sulfide and yet pass the Agilent Model 355 Sulfur Chemiluminescence Detector (SCD) test.

Agilent Model 355Sulfur Chemiluminescence Detector (SCD) is a gas chromatograph detector used for measuring sulfur compounds. It can measure sulfur compounds in wine, including hydrogen sulfide, carbon disulfide, methyl mercaptan, ethyl mercaptan, dimethyl sulfide, etc.

This document describes the method of rapidly analyzing and quantifying sulfur dioxide (SO2) in beer using a sulfur chemiluminescence detector (SCD) and headspace gas chromatography. It also mentions the importance of SO2 in the brewing process and the impact of SO2 concentration on beer quality and shelf life.