Electrolytic conductive detector

Analysis of environmental samples is similar to that of biological samples. The most common methods of analyses are GC coupled to MS, ECD, a Hall s electrolytic conductivity detector (HECD), or a flame-ionization detector (FID). Preconcentration of samples is usually done by sorption on a solid sorbent for air and by the purge-and-trap method for liquid and solid matrices. Alternatively, headspace above liquid and... 

ECD = electron capture detector FID = flame ionization detection GC = gas chromatography HECD = Hall electrolytic conductivity detector HRGC = high-resolution gas chromatography HSD = halogen-specific detector H2SO4 = sulfuric acid MS = mass spectrometry NR = not reported PID = photoionization detection UV = ultraviolet detection... 

Gas chromatograph [Flewlett-Packard (FIP) 5890 or 6890 GC with HP 7673 or 6890 Series injector and OI Analytical Model 5220 electrolytic conductivity detector or 5360 halogen-specific detector HP 5890 or 6890 equipped with HP 7673 or 6890 Series injector and HP 5970 or 5972 mass-selective detector]... 

Analytical 5220 electrolytic conductivity detector, halogen mode... 

The most widely used element-selective electrochemical detector is the Hall electrolytic conductivity detector (HECD) [98,116,206]. This is an improved version of an earlier design by Coulson [207,208]. In both detectors the reaction products are swept from the furnace into a gas-liquid contactor trtiere they are mixed with an appropriate solvent. The liquid phase is separated from insoluble gases in a gas-liquid separator and then passed through a conductivity cell. The Coulson detector employed a... 

Figure 3.16 Schenatic diagran of a Hall electrolytic conductivity detector with an expanded view of the bipolar pulsed differential conductivity cell.

The Bellar et al. [219] purge and trap method has been applied to the determination of vinyl chloride in seawater. Using the Hall electrolytic conductivity detector, no response was obtained for the acetone used to prepare the vinyl chloride standard solution. 

AOAC = Assocition of Official Analytical Chemists ASTM = American Society for Testing and Materials Cl = chemical ionization ECD = electron capture detection ELCD = electrolytic conductivity detector EPA = Environmental Protection Agency GC = gas chromatography GPC = gel permeation chromatography ... 

ECD = electron capture detection ELCD = electrolytic conductivity detector EPA = Environmental Protection Agency GC = gas... 

The best sensitivity for 1,2-dibromoethane quantification is obtained by either electron capture detector (ECD) or Hall electrolytic conductivity detector (HECD) in the halide detection mode, since these detectors are relatively insensitive to nonhalogenated species and very sensitive to halogenated species. Another common detection device is a mass spectrometer (MS) connected to a GC. The GC/MS combination provides unequivocal identification of 1,2-dibromoethane in samples containing multiple components having similar GC elution characteristics (see Table 6-2). To date, GC equipped with either ECD or HECD has provided the greatest sensitivity for detecting... 

ECO = electron capture detector ED = electrochemical detector FID st flame ionization detector GC = gas chromatography HECD = Hall s electrolytic conductivity detector HPLC = high performance liquid chromatography MEC = molecular emission cavity analysis MS - mass spectrometry HD = photo-ionization detector... 

Eopez-Avila V, Heath N, Hu A. 1987. Determination of purgeable halocarbons and aromatics by photoionization and Hall electrolytic conductivity detectors connected in series. J Chromatog Sci 25 356-363. 

B Aromatic and Halogenated Volatiles by GC using Photoionization and/or Electrolytic Conductivity Detectors 8031 Acrylonitrile by GC... 

The halogen selective microcoulometric and electrolytic conductivity detectors have been applied extensively to the analysis of halogenated compounds in drinking water. Both have adequate sensitivity for the application and sufficient selectivity to allow reasonably accurate identifications with the retention time data. However, these detectors are also best applied to well defined samples where the probability of unexpected compounds is low. 

EPA. 1989c. Measurement of volatile organic compounds in water by purge and trap capillary column gas chromatography with photoionization and electrolytic conductivity detectors in series -method 502.2. Cincinnati, OH U.S. Environmental Protection Agency, Environmental Monitoring Systems Laboratory. 

Electrolytic conductivity detector (i) Pure hydrogen/Air flame... 

Gluck, S. J. The Response of the Model 700A Hall Electrolytic Conductivity Detector to Sulfur Containing Molecules Symposium On Environmental Analytical Chemistry, Brigham Young University, Paper IF, 1980. 

The halogenated method employs a packed column of 1% SP-1000 on Carbopak-B (60-80 mesh) as its primary analytical column. The column is 8-ft X 0.1-in. i.d. It is operated at a helium flow rate of 40 mL/min under programmed temperature conditions of 45 °C isothermal for 3 min, then 8 °C/min to 220 °C, and then held at 220 °C for 15 min or until all compounds have eluted. An electrolytic conductivity detector operated in the halide-specific mode is used for measurement. 

Pesticides and Their Residues. Gas chromatography in combination with selective detectors such as electron capture, phosphorus and electrolytic conductivity detectors (see Chapter 5) have made the detection of such components and their measurement relatively simple. Detailed information in this area may be found in a monograph by Grob (37). 

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