Analytical Instrumentation Inert sample path


Sulphur components very easy adsorb on active surfaces, therefore Sulfinert deactivation is applied to the full sample path, which is vital for accurate quantification.


Calibration


Calibration is often based on a single calibration gas which is adequate when concentration levels of sample and calibration gas are comparable. A multipoint calibration is advised when larger concentration ranges have to be covered. The ACU module (figure 6 and 7) is utilised to create multiple calibration levels using a single calibration gas or using permeation tubes. The various levels can be pre-programmed and synchronised with the GC sequence, resulting in a completely automated multipoint calibration, running for instance overnight. Fig 8 shows excellent linearity for Sulphur components using dynamic blending.


Figure 10: CompactGC4.0 and PFPD.


: 19” analyser with thermal desorption module


15


Figure 8: Excellent linearity for 100 ppb-5 ppm H2S using dynamic dilution from a single calibration standard (GSV-PFPD).


CGC-TD


Sample pre-concentration using a thermal desorption trap is successfully applied for the analysis of sub ppb level Sulphur components. Figure 9 shows the basic principle: the components of interest are trapped on a Peltier cooled adsorbent, and then injected on the column by very fast heating of the trap. This thermal desorption option is placed in CompactGC4.0


(figure 10).


Figure 6: ACU Calibrator diagram with dynamic dilution and permeation oven.


With PFPD a limit of detection of 0.5 ppb is achieved in this way for Hydrogen sulfide, Methylmercaptane, Dimethyl sulfide and Dimethyl disulfide (see figure 11).


Figure 11: Sulphur components in air using TD-PFPD. Limit of detection: 0.5 ppb.


Summary Figure 9: Principle Thermal Desorption for low level Sulphur analysis.


Figure 7: ACU calibrator for automated multipoint calibration for Sulphur analysis.


Author Contact Details Wilco Agterhuis, Ronald Verbeek, G.A.S – Global Analyser Solutions • Tel +31 (0)76 5411800 • Email: : info@gas-site.com • Web: www.gas-site.com


Sulphur components are traditionally analysed by selective Sulphur detectors like FPD and PFPD. Both provide robust and sensitive analysis; the maximum achievable sensitivity for PFPD is 15-40 ppb (depending on component), while FPD shows LODs between 100 and 200 ppb. GCMS is a highly interesting alternative: good linearity and improved sensitivity and selectivity were found in the low ppb range (below 10 ppb). GCMS offers positive component identification as well, and besides Sulphur components other impurities like Arsine, Phosphine and Oxygenates are also analysed. A Compact solution was shown based on thermal desorption-PFPD, with 0.5 ppb detection limit for Sulphur components in air.


• Tinstraat 16, 4823 AA Breda, The Netherlands


Spectro Scientific Event Marks Five Years of Growth in China


On November 30, 2016, Spectro Scientific, suppliers of oil, fuel, and processed water analysis instrumentation and software, noted five years of the company’s growth in the Chinese market with a celebratory event in Beijing. More than 100 industrial customers, government representatives, and members of the Chinese Academy of Sciences attended the gathering.


Mr. Carey Ross, Chief Financial Officer at Spectro Scientific addresses group of customers, business associates, government representatives, and members of the Chinese Academy of Sciences in Beijing recently.


Spectro Scientific global sales vice president Yuegang Zhao, company chief financial officer Carey Ross, and the staff of the Spectro Beijing office hosted the event, where local speakers revealed development trends in oil analysis technologies implemented in Chinese industrial facilities. In addition, users of Spectro products from analytical laboratories and the power generation, railroad, and


petrochemical industries described the application and benefits of fluid analysis systems.


Spectro Scientific took advantage of the event to introduce


new products and technologies to the Chinese market. They included the company’s FerroCheck 2000 portable magnetometer for measurement of ferrous wear particles in lubricants; the MiniLab 153, that combines multiple tests to monitor lubricant chemistry, contamination and machinery wear for power and industrial manufacturing plants; the FieldLab Q5800, a rugged, portable expeditionary fluid analysis system for military and OEM service professionals; and the fully automated MicroLab® oil analyser for trucking fleets, mining equipment, and oil and gas drilling platforms.


Spectro chief executive officer Brian Mitchell noted that sales of Spectro products have grown significantly over the last five years, recently prompting the company to relocate its Beijing office and physically expand it in size to better serve its customers. Discussing the company’s progress in the region, Mitchell said, “Spectro’s contributions in the Chinese market help reduce costs, protect capital equipment, and increase the reliability of the country’s manufacturing processes, while also representing an ongoing growth opportunity for our company.”


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