Analytical Instrumentation 13


Figure 3: ASTM D7213-05 (D2887 extended) resolution and skewness requirements are easily met using low bleed MXT®


-1HT SimDist columns.


Increase Lab Productivity with High Efficiency Columns


In addition to low bleed, column efficiency is also a critical factor in simulated distillation. Columns that are higher in efficiency produce sharper peaks and higher resolution values, which result in more samples analysed before the column fails the minimum resolution specification. The chromatograms in Figures 1-4 show typical separations for simulated distillation following ASTM methods; in all cases, the high efficiency of the MXT® resolution needed for highly reproducible results.


-1HT SimDist column provides the


In addition to high efficiency, column inertness can affect resolution as active sites in a poorly deactivated column can result in significant tailing. MXT® deactivation process, Siltek®


allows more accurate low level sample analysis. Column: MXT® -1HT SimDist, 5 m, 0.53 mm ID, 0.10 µm (cat.# 70112); Sample: C5-C72 hydrocarbons (Separation


Systems SD-ss3e-03); Diluent: CS2; Conc.: 1%; Injection: 0.5 µL cold on-column; Temp. Program: 53°C to 380°C at 10°C/min. (hold 12 min.); Oven Temp: 50°C to 380°C at 10°C/min. (hold 12 min.); Carrier Gas: He, constant


flow, 12 mL/min.; Detector: FID @ 390°C; Make-up Gas Flow Rate: 18 mL/min.; Make-up Gas Type: N2; Instrument: Shimadzu 2010 GC.


Figure 4: ASTM D7169 symmetry and resolution criteria are reliably met and exceptionally low bleed is observed at 450°C with MXT®


-1HT SimDist columns. Restek Corporation


Restek is a leading developer and manufacturer of chromatography columns, standards, and accessories. We provide analysts around the world with the innovative tools they need to monitor the quality of air, water, soil, food, pharmaceutical, chemical, and petroleum products.


www.restek.com


Conclusion The MXT®


-1HT SimDist columns undergo a unique treatment, which bonds amorphous silica to the inner surface of the


column tubing. This process stabilises the dimethyl polysiloxane coating resulting in a highly inert, exceptionally low bleed column. Siltek®


deactivation reduces active sites, minimises tailing, and


-1HT Sim Dist column is a robust analytical column that performs well for ASTM high


temperature simulated distillation methods. The exceptionally low-bleed and high-efficiency characteristics of this column translate directly into assured method performance, reliable final boiling point determinations, and better control of refinery processes.


Column: MXT®


-1HT SimDist, 5 m, 0.53 mm ID, 0.10 µm (cat.# 70112); Sample: Custom C5-C106 hydrocarbon


standard; Diluent: CS2; Conc.: 1%; Injection: 0.5 µL cold on-column; Temp. Program: 53°C to 450°C at 10°C/min. (hold 5 min.); Oven Temp: 50°C to 450°C at 10°C/min. (hold 5 min.); Carrier Gas: He, constant flow,


18 mL/min.; Detector: FID @ 450°C; Make-up Gas Flow Rate: 24 mL/min.; Constant Column + Constant Make- up: 42 mL/min.; Make-up Gas Type: N2; Data Rate: 20 Hz; Instrument: Shimadzu 2010 GC.


Automatic Pensky-Martens Flash Point Tester PMA 5 with Integrated Fire Extinguisher


Petrotest (Germany), a company of Anton Paar, now offers the PMA 5 Pensky-Martens (ASTM D93) flash point tester that performs flash point testing of petroleum products using Pensky- Martens closed-cup ASTM D93 A, B and C methods. PMA 5 can be used for both biodiesel and biodiesel blended fuels along with such distillate fuels as diesel, heating oil and kerosene and such potentially flammable liquids as lubricating oils, paints and varnishes.


With an integrated fire extinguisher as standard delivery item, PMA 5 highly improves user safety. Among the features of this highly versatile bench-top instrument are an over-temperature protection circuit, splash-proof membrane key panel, and a built-in sensor for automatic barometric pressure correction. The PMA 5 also offers both gas and electric ignition options standard. In addition, the instrument features a convenient to use multi-function head for easy one-hand simultaneous connection of all sensors and actuators.


Among the advantages of the PMA 5 is its ability to heat samples, while the instrument performs tests unattended. Heating keeps samples with a high-melting point liquid at temperatures above 150oC, allowing for the immediate start of the stirrer when flash point


testing begins. This saves time and makes cleaning easier.


PMA 5 comes completely ready for testing with automatic test routines, user definable programs as well as a rapid search program. The easy-to-operate analyser features the latest electronics, including a 5.7-inch color graphics display and Pmove® input of e.g. test parameters, sample name and program selection.


jog wheel for


It has selectable output, either °C or °F, and a measuring temperature testing range from ambient to 405°C (761°F) without requiring any additional equipment. Come and see this new instrument and more from Petrotest at our exhibition stand at ACHEMA, hall 4.1, stand H7.


Reader Reply Card No 33


New Digital Economy Polarimeter


Krüss (Germany) have developed a high-speed measurement that reduces measuring time of samples to only 1 second irrespective of the angle of the sample. Compared to other polarimeters, much time is saved during the measuring process.


The P3000 is an economy version of the P8000 and operates just as fast as its big brother. An intuitive touch screen with basic functions has been implemented as well. Measuring results are shown either in optical rotation or in the international sugar scale. Data can be exported to a printer via an RS-232 interface.


For industries – i.e. sugar industry – which don’t need more than 2 digits after the decimal point and perform standardised measuring, the P3000 can be excellent value for money.


Reader Reply Card No 34 April / May 2012 • www.petro-online.com


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