The measurement of manganese (Mn) in gasoline is demonstrated.
Jul 17 2019 Read 471 Times
Methylcyclopentadienyl manganese tricarbonyl (called MMT or MCMT) is an anti-knock agent added to motor gasoline (mogas) and aviation gasoline (avgas) to boost octane rating, replacing tetraethyl lead (TEL) in many regions of the world. In mogas, the \Mn content is typically between 50-500 mg/kg, and can be as high as 3000 mg/kg (approximately 3 g/L) in Avgas. Reliably characterising the Mn content of gasoline ensures optimum engine performance based on the engine’s compression ratio and other geometrical and mechanical operating conditions. To meet the needs of the industry, Rigaku offers NEX QC+, a simple and versatile benchtop energy dispersive X-ray fluorescence (EDXRF) analyser for the analysis of manganese in gasoline
- Model: Rigaku NEX QC+
- X-ray tube: 4W Ag-anode
- Detector: SDD
- Sample Type: Gasoline
- Film: Chemplex Etnom (3um)
- Analysis Time: 100 sec
- Environment: Air
Ensure each sample is homogeneous and stable. Shake sample gently and allow any bubbles to settle. Fill a 32mm XRF sample cup with 4g of sample to ensure consistent sample depth. Etnom® film (3um) is used, which does not degrade quickly with gasoline or oxygenated gasoline. The sample cup lid must be vented with a small hole to ensure vapor pressure does not build. Due to high evaporation rate of gasoline, it is recommended to make the measurement immediately after filling the cup. [Note: Use of internal standard is not required.]
Empirical calibration is made using commercially available certified gasoline calibration standards containing the Mn additive. A typical calibration is demonstrated here for the range 25-500 mg/kg Mn. (See Figure 1)
Instrument repeatability (precision) is determined by ten repeat analyses of each sample in static position using a 100 sec analysis time per measurement. (See Figure 2)
The Lower Limit of Detection (LLD) is defined as three times the standard deviation of ten repeat analyses of a blank gasoline sample containing no Mn. The following typical LLDs are reported here using 100 and 300 sec measurement times. (See Figure 2)
The results shown here indicate the Rigaku NEX QC+ EDXRF analyser can be used to reliably measure Mn in gasoline and Avgas without the need to use an internal standard.
Do you like or dislike what you have read? Why not post a comment to tell others / the manufacturer and our Editor what you think. To leave comments please complete the form below. Providing the content is approved, your comment will be on screen in less than 24 hours. Leaving comments on product information and articles can assist with future editorial and article content. Post questions, thoughts or simply whether you like the content.
In This Edition Fuel For Thought - Krohne appoints new advisory board chairman and new executive board - Dinamica Generale US to acquire Zeltex Inc. - Halma expands gas detection capabiliti...
View all digital editions
Jun 02 2020 Baku, Azerbaijan
Jun 02 2020 St John's, Newfoundland
Jun 02 2020 Baku, Azerbaijan
Jun 08 2020 Seville, Spain
Jun 09 2020 Calgary, Alberta, Canada