This method is used to determine the gas-phase concentrations of selected volatile silicon compounds (VSiCs) in the ppbv to ppmv concentration range in biogas and other gas samples. After the sample undergoes preconcentration to remove water vapor and matrix gases, gas chromatography is used to speciate the target analytes. A spectroscopic detection method such as mass spectroscopy, atomic emission spectroscopy, or inductively coupled plasma mass spectroscopy, is used to detect and quantify the VSiCs. Targeted VSiCs are trimethylsilanol, pentamethyldisiloxane, hexamethyldisiloxane, hexamethylcyclotrisiloxane, octamethyltrisiloxane, octamethylcyclotetrasiloxane, decamethyltetrasiloxane, decamethylcyclopentasiloxane, dodecamethylpentasiloxane, dodecamethylcyclohexasiloxane.
Silica generated from the combustion of gases containing VSiCs can damage internal combustion engines or microturbine blades, as well as to reduce heat transfer efficiency. Silica can also poison catalytic oxidizers that are used to control regulated VOC emissions. The capacity to analyze VSiCs in typical biologically derived fuel gases is highly desirable in order to assess the efficacy of gas pretreatment measures. Users include producers of analytical equipment and gases, contract analytical laboratories, government or private laboratories that test the quality of gaseous fuels.
Keywordssilicon, siloxane, silane, GC/MS, GC/AED, GC/ICP-MS, digester gas, landfill gas.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Draft Under Development