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ADVANCES IN SEPARATION SCIENCE continued


especially for alcohols and aromatics. For a polar phase, it is remarkably stable, with a Tmax of 270 °C. The SLB-IL76i is slightly less polar and the SLB-IL60i is even less so. The latter is similar in polarity to pegylated (PEG)/wax columns but has a Tmax


of 280 °C. MilliporeSigma recom-


mends the SLB-IL60i for GC × GC applications where the first column is nonpolar.


Assay of trace water by GC is unusual, as water often destroys the stationary phase. The choice of appropriate instruments is limited to thermal conductivity detectors, which are not very sensi- tive. Even with these limitations, MilliporeSigma introduced Supelco Watercol ionic-liquid sta- tionary phases in capillary-column format (see Figure 1). A range of specific ionic liquids can be used, and selection is sample-specific.


Sample processors for GC The O.I. Analytical Eclipse 4760 purge-and-trap sample concentrator, for the analysis of VOCs by gas chromatography, features patented foam sensor technology that aborts the purge cycle should foam develop (see Figure 2). TruColour LED illumination of the purge chamber (the color changes as the purge-and-trap cycle proceeds) allows the status to be checked from across the room. Patented cyclone water management removes more than 96% of the adsorbed water to protect the GC column.


CDS Analytical’s (Oxford, Penn.) CDS 7000 E purge-and-trap concentrator is compatible with all GC and GC/MS instruments. The up- graded instrument incorporates a wet trap that eliminates more than 96% of moisture from the sample. A patented foam sensor is standard. Pneumatic functions are separated from the electronics to improve durability. Method change from purge and trap to thermal desorption is quick and easy.


Autosamplers HTA s.r.l. (Brescia, Italy) displayed the HT2800T autosampler for GC (see Figure 3) and HT4000L autosampler for HPLC. Starting with the injec- tion mode, the HT4000L performs full- and partial-loop injection with precision. Sample capacity is 176 2-mL vials. Users can also select from 4- to 40-mL containers as well as multiple-well plates. Sample preparation is au- tomated, including dilution, derivatization and internal standard addition. Injection valves for ultrahigh-performance liquid chromatography


Figure 2 – O.I. Analytical’s 4100 Water/Soil Sample Processor is shown with two of the new O.I. Eclipse 4760 purge-and-trap sample concentrators. The 4760 TruColour Indicator changes color as the status of the unit changes: the blue unit is in the “purge end” mode; the red unit is in “bake” mode. (Image courtesy of O.I. Analytical.)


Figure 3 – HT2800T autosampler for GC. (Image courtesy of HTA s.r.l.)


(UHPLC) and large sample volumes are available and can be user-installed. Biocompatible flow paths and sample cooling are other options.


HT2800T can be mounted on any gas chro- matograph. A vial heater or cooler and vortex station support pre-injection sample prep. Other options include headspace assay with


AMERICAN LABORATORY 18 MAY 2016


vial-leak check and solid-phase microextrac- tion (SPME). A high-resolution touchscreen provides a quick, intuitive human interface. Automation protocols are compatible with modern gas chromatographs. External control and data reporting are compliant with CFR21 Part 11.


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