NexCG Cartesian

Rigaku Nex CG

Rigaku NEX CG delivers rapid qualitative and quantitative determination of major and minor atomic elements in a wide variety of sample types — with minimal standards.

Cartesian geometry for trace level sensitivity
Unlike conventional EDXRF analyzers, the NEX CG was engineered with a unique close-coupled Cartesian Geometry (CG) optical kernel that dramatically increases signal-to-noise. By using monochromatic secondary target excitation, instead of convention direct excitation, sensitivity is further improved. The resulting dramatic reduction in background noise, and simultaneous increase in element peaks, result in a spectrometer capable of routine trace element analysis even in difficult sample types.

Novel software reduces the need for standards
NEX CG is powered by a new qualitative and quantitative analytical software, RPF-SQX, that features Rigaku Profile Fitting (RPF) technology. The software allows semi-quantitative analysis of almost all sample types without standards — and rigorous quantitative analysis with standards.

• Analyze ₁₁Na to ₉₂U non-destructively
• Solids, liquids, powders and thin films
• Polarized excitation for lower detection limits
• Novel treatment of peak overlap reduces errors
• PPB detection limits for aqueous samples using UltraCarry
• Simplified user interface with EZ Analysis


Cartesian geometry energy dispersive X-ray fluorescence spectrometer

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NEX CG Applications

Additive Elements in Lubricating Oils ASTM D7751

Measurement of additive elements in lubricating oils by ASTM D7751 is demonstrated.

Controlling additive elements when blending new, fresh lubricating oils is vital to ensure correct lubrication properties and minimizing production waste and product rejection. EDXRF is a fast and simple analytical technique for use by non-technical operators, yet powerful enough for expert use in the research & development of new lube oil formulations. To meet the industry needs in production and research Rigaku NEX CG offers compliance to D7751 Standard Test Method for Additive Elements in Lubricating Oils by EDXRF Analysis.

Analysis of coal by FP method

The analysis of coal is demonstrated, with specific emphasis on the measurement of Na2O, using the Fundamental Parameters (FP) approach with Matching Library.

During the mining, processing and burning of coal, process monitoring and control are vital to the efficiency and quality of the final product. Whether screening incoming raw materials, monitoring production processes, or QA/QC out-processing, a fast, simple, and accurate method for analyzing samples is important throughout the production cycle. Specific attention is often given to the sodium content (Na2O). High sodium content can combine with sulfur or aluminum and silicon to form sodium sulfate or sodium alumina-silicate compounds. Such compounds, formed when burning high sodium coals, can lead to fouling of the cyclone or heat exchange surfaces.

Analysis of finished Portland cement

The analysis of finished Portland cement is demonstrated using the empirical approach.

EDXRF is a simple analysis technique used in cement plants around the world. The technique is ideal for QA/QC throughout the cement production process. EDXRF can be used as a screening tool and a quality control analyzer to ensure proper composition of incoming feedstocks, raw meal mixture balances, addition of gypsum and throughout the manufacturing process. The EDXRF analyzer also makes an excellent backup instrument for the WDXRF analyzer used for final QC and certification.

Analysis of gemstones.

Analysis of gemstones is demonstrated, using low power 50W EDXRF with indirect excitation

Elemental measurement is important in gemology for identification, classification and characterization of both natural and synthetic gemstones. Minor and trace levels of metals, especially the transition metals, as well as alkali elements and alkaline earth elements (such as Mg, K, Ca, Sr and Rb) help to establish the geographic region and environmental conditions during the formation of a gemstone. Other elements like Au and Pb can be used to indicate processing requirements of synthetics

Analysis of heavy metals in aerosols on air filters

Measurement of heavy metals in aerosols on air filters is demonstrated. Simple linear empirical calibration is discussed, and performance is shown, for measurement precision and typical detection limits.

Element analysis of aerosols and particulate matter released in smokestacks, and other industrial gas discharge, is vital to ensure that environmentally acceptable levels of toxic and hazardous elements are released properly into the air. Monitoring smoke or other gaseous waste is important in many areas, such as industrial manufacturing, coal-fired power plants, chemical and plastics production, etc., in order to minimize air pollution and the release of toxic metals in compliance with US EPA and other world and regional or local governing regulations. As a tool to help ensure compliance and proper release, Rigaku offers the NEX CG EDXRF analyzer with polarized and secondary target excitation, giving the analysts and technician alike a fast, simple, yet powerful means of elemental analysis of air filters.

Analysis of Lead/Zinc Ore

The analysis of Pb/Zn ore is demonstrated using empirical calibration method.

Elemental analysis is important in the analysis of ores, from screening at the mine site and throughout the processing areas to final analysis. Majors and minors are important during processing, to ensure proper extraction and process control. Trace elemental analysis, especially of precious metals, is also extremely important to ensure the value of the processing is optimized. In lead/zinc ores the money elements are lead, zinc and in some ores silver, as well. Along the entire processing line, a fast and simple technique is required to monitor these and other elements. Rigaku offers the NEX CG EDXRF elemental analyzer to meet these industry challenges. The NEX CG, using indirect excitation and polarization, is a powerful, yet simple tool for the measurement of the elements sodium through uranium in rocks and ores.

Analysis of limestone

The analysis of limestone is demonstrated using the empirical approach.

Limestone has historically been used as a major material in the construction of buildings and monuments, as well as the production of glass. More modern used of limestone include as a raw material in the production of quicklime, cement and mortar, as well as a basic aggregate in road construction. Limestone is also used as a scrubber stone in the desulfurization of flue gas and is used as a reagent in blast furnaces to extract iron from ore. Purified, limestone has many uses as a calcium supplement in foods and animal feeds, and well as a whitener in cosmetics. The high calcium content of limestone is also an ideal ingredient in remineralization and can be used in water, toothpaste, mouth rinses, etc. Because of the wide variety of uses for limestone, quality control and precise characterization is an important part of limestone mining and processing operations.

Analysis of lube oils by FP method

This Application Note shows performance for the elemental analysis of P, S, Ca, Zn, Mg, Ba, Cu and Cl in a typical lubricating oil formulation using the fundamental parameters method (FP). Results are reported using standardless FP with and without the use of a Matching Library, and typical detection limits are presented.

Lubricating oils are used in on-road and off-road engines, as well as in the lubrication of mechanical machinery. The lube oils are formulated specifically for each type of use. Various additives are formulated in base lube oil to enhance lube oil performance and create the optimum lubricity properties desired for each situation. Proper and safe operation of engines and machinery depends to a large degree on the quality and formulation of the lube oil. Therefore, quality control and quality assurance during the lube oil manufacturing process is essential. A fast, simple method of analyzing lube oils is important throughout the QC/QA process. The analytical technique must be simple enough for use by non-technical operators, yet powerful enough for expert use in the research & development of new lube oil formulations.

More application notes are available by submitting the application request form