HT8: THE PERFECT PCB COLUMN
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1 HT8: THE PERFECT PCB COLUMN Retention data for all 209 chlorinated biphenyl congeners Peak identification for Aroclor 1242, 1254 and 1260 Congener specific selectivity, extremely low column bleed, excellent signal to noise ratio and reliable is how many describe the performance of SGE s carborane modified HT8 capillary column when applied to Aroclor and PCB analysis. Carborane based phases have long been recognised for the unique selectivity they exhibit towards complex isomer mixtures, particularly those containing aromatic ring systems. Their extremely high thermal stability and resultant compatibility with sensitive detector systems like electron capture and mass spectrometry make HT8 "the" ideal choice for the analysis of PCBs. The unique selectivity of the HT8 column is attributed to the presence of the carborane unit having an affinity towards chlorinated biphenyls (CBs) with the least number of ortho-substitutions. Fewer substitutions in the ortho position increase freedom of rotation, allowing the CB moiety to have greater interaction with the carborane unit 1. This unique HT8 phenomenon causes non-ortho substituted CBs to have increased elution times compared to their ortho-substituted congeners. This allows detection and quantitation of many important CB s used to monitor PCB occurrence and distribution in the environment. HT8 Standard 5% Phenylsiloxane Column Specifications HT8: 8% Phenyl (equiv) Polycarborane-siloxane Phase Min. Operating Temp.: -20 C Max. Operating Temp.: 360 C Max. Cycling Temp.: 370 C Separation and identification by GC/MS of the seven CB used by many regulatory and government bodies to monitor PCB occurence and distribution in the environment. Congener # Cl Position Cl # Identification by GC/MS * * * * * * * CB69 rarely occurs in any Aroclor mixtures Figure 1 demonstrates clearly the significant difference in selectivity of the HT8 column. By GC/MS, quantitation of CB28 using a standard 5% phenylpolysiloxane column is impossible as coelution with CB31 (with the same numbers of chlorines) occurs. HT8 separates the two congeners by a full minute allowing quantitation to be performed with ease. 1. J. deboer, Q. Dao and R. van Dortmond, J. High Resolut. Chromatogr. in print. Figure 1. Separation of CB31 & CB28
2 AROCLOR 1242 Phase: HT8, 0.25 μm film Column: 50 m x 0.22 mm I.D. Initial Temp.: 80 C, 2 min Rate 1: 30 C/min Temp 2: 170 C Rate 2: 3 C/min Final Temp.: 300 C. Carrier Gas: Helium, 40 psi Detector: ECD, 330 C AROCLOR 1242 Congener # Cl Position Cl # Identification by GC/MS
3 AROCLOR 1260 Column and Oven conditions are as listed for Aroclor 1242 AROCLOR 1260 Congener # Cl Position Cl # Identification by GC/MS
4 AROCLOR 1254 Column and Oven conditions are as listed for Aroclor PCB CONGENERS IN ELUTION ORDER
5 209 PCB CONGENERS IN ELUTION ORDER
6 *Oven and Column conditions used to obtain the retention times for all 209 congeners are those used for the analysis of Aroclor 1242, 1254 and Peak Identification of the three Aroclor standards are based on the elution order as shown in the 209 PCB Congeners in elution order table. HT8 (no equivalents, unique ultra high temperature technology) 8 % Phenyl (equiv.) Polycarborane-siloxane Description Part No. 10 m x 0.1 mm ID x 0.1 micron film - FAST PCB (HT8) m x 0.22 mm ID x 0.25 micron film - HT m x 0.32 mm ID x 0.25 micron film - HT m x 0.53 mm ID x 0.50 micron film - HT m x 0.22 mm ID x 0.25 micron film - HT m x 0.32 mm ID x 0.25 micron film - HT m x 0.53 mm ID x 0.50 micron film - HT m x 0.25 mm ID x 0.25 micron film - HT m x 0.22 mm ID x 0.25 micron film - HT Specifications are subject to change without notice. AP-0040-C RevB SGE Analytical Science Pty Ltd October 2008
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