Analytical Instrumentation 23
On-Line, Real-Time Process Elemental Analysis by EDXRF
Featuring advanced 3rd generation energy dispersive X-ray fluorescence (EDXRF) technology, the Rigaku (USA) NEX OL represents the next evolution of process
elemental analysis for liquid stream and fixed position
web or coil applications. Designed to span from heavy industrial through to food grade process gauging solutions, the NEX OL is configurable for use in both classified and non-classified areas.
To deliver superior analytical performance and reliability, the EDXRF measuring head assembly was derived from the established Rigaku NEX QC+ high resolution benchtop instrument. With this proven technology, the Rigaku NEX OL delivers rapid, non-destructive, multi-element analyses – from parts-per-million (ppm) levels to high weight percent (wt%) concentrations – for elements from aluminum (13Al) through uranium (92U). Equipped with a 50 kV X-ray tube and SDD detector – together with a standardised, optimised suite of tube filters – the Rigaku NEX OL is engineered to solve a broad range of process control applications.
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New 5th Generation MiniFlex Benchtop X-Ray Diffractometer (XRD)
The 5th generation MiniFlex from Rigaku (USA) is a general purpose X-ray diffractometer that can
perform qualitative and quantitative analysis of polycrystalline materials. The MiniFlex is available in two variations. Operating at 600 watts (X-ray tube), the MiniFlex 600 is twice as powerful as other benchtop models, enabling faster analysis and improved overall throughput. Running at 300 watts (X-ray tube), the new MiniFlex 300 does not require an external heat exchanger. Each model is engineered to maximise flexibility in a benchtop package.
Ideally-suited for today's fast-paced XRD analyses, the new 5th generation MiniFlex delivers speed and sensitivity through innovative technology enhancements such as the optional D/teX high speed detector coupled with the new 600W X- ray source. The optional graphite monochromator, coupled with the standard scintillation counter, maximises sensitivity by optimising peak-to-background ratios. If resolution is paramount, incident and diffracted beam slits can be selected to provide the desired resolution. For high sample throughput, MiniFlex is the only benchtop XRD system with an available sample changer. Whether teaching X-ray diffraction at college and university level, or routine industrial quality assurance, the MiniFlex delivers both performance and value.
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Analysis of Sulphur and Chlorine in Crude Oil by EDXRF
Applied Rigaku Technologies, Inc. (USA) has published a new application note describing the analysis of sulphur (S) and chlorine (Cl) in crude oil by energy dispersive X-ray fluorescence (EDXRF). The report includes complete information about sample preparation, method calibration and repeatability, and demonstrates the multi-element capabilities of the new Rigaku NEX QC+ analyser.
EDXRF is a technique widely used in the industry for sulphur measurement, as well as for measuring other elements present in oils and fuels. The analysis method described in the new report offers a fast, simple means of screening and monitoring the chlorine content of crude at the well site, along pipelines, during blending and other pre-refining examinations. For the analysis described in the report, eight certified oil standards were used to develop empirical calibrations for sulphur and chlorine. The empirical method was used to determine the detection limits for both elements. Measurements shown in the report were carried out on the Rigaku NEX QC+ spectrometer, a new low cost, high resolution benchtop EDXRF elemental analyser featuring a high-resolution Peltier cooled Silicon Drift Detector (SDD) and 50 kV X-ray tube, which provides greater applications versatility and low limits-of-detection (LOD). The configuration is designed to enable more precise analytical results with shorter measurement times.
The results demonstrate that, given stable samples, proper sample handling and proper calibration techniques, the use of compact benchtop instrumentation employing semiconductor detectors can easily resolve and measure sulphur and chlorine present in oil. The spectrum presented confirms that the Rigaku NEX QC+ EDXRF analyser can achieve excellent results in screening and monitoring the concentration of sulphur, chlorine and other elements in crude oil and other similar oils.
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