Multicomponent Determination of Chlorinated Hydrocarbons Using a Reaction-Based Chemical Sensor. 1. Multivariate Calibration of Fujiwara Reaction Products

1994 ◽  
Vol 66 (20) ◽  
pp. 3328-3336 ◽  
Author(s):  
John M. Henshaw ◽  
Lloyd W. Burgess ◽  
Karl S. Booksh ◽  
Bruce R. Kowalski
Keyword(s):  
Chemical Sensor ◽  
Multivariate Calibration ◽  
Chlorinated Hydrocarbons ◽  
Reaction Products ◽  
Fujiwara Reaction

Electrochemical SERS Detection of Chlorinated Hydrocarbons in Aqueous Solutions

1994 ◽  
Vol 48 (10) ◽  
pp. 1265-1271 ◽  
Author(s):  
John M. E. Storey ◽  
Robert D. Shelton ◽  
Tye E. Barber ◽  
Eric A. Wachter
Keyword(s):  
Chlorinated Hydrocarbons ◽  
Copper Electrode ◽  
Specific Class ◽  
Reaction Products ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Enhanced Raman Scattering

An in situ method for the determination of trichloroethylene (TCE), perchloroethylene (PCE), chloroform (CHCl3), and carbon tetrachloride (CCl4) in aqueous solution is described. The method is based on ESERS—a combination of electrochemical methods and surface-enhanced Raman scattering (SERS). Electrochemistry prepares the surface of a copper electrode for SERS and concentrates the analyte on the surface. The formation of common reaction products for chloroalkanes and for chloroalkenes prevents unequivocal differentiation within a specific class of chlorinated hydrocarbons. However, spectroscopic selectivity between the chloroalkane and chloroalkene classes is excellent, while differences in electrochemical response provide a secondary means for differentiating analyte class. Sensitivity was found to be: <1 ppm for TCE; 15 ppm for PCE; 15 ppm for CHCl3; and 10 ppm for CCl4. Application of the method to groundwater contaminated with TCE has been demonstrated. In combination with a fiber-optic waveguide, the ESERS technique offers potential for remote detection of chlorinated hydrocarbons in groundwater and remediation process streams.

Rapid Quantitative Vatside Check Test For Chlorinated Hydrocarbons in Aqueous Emulsions: Toxaphene and Lindane

1965 ◽  
Vol 48 (2) ◽  
pp. 334-338
Author(s):  
Fred P Czech
Keyword(s):  
Organic Solvent ◽  
Field Test ◽  
Chlorinated Hydrocarbons ◽  
Reaction Products ◽  
Special Equipment ◽  
Field Worker ◽  
Organic Halogen ◽  
Alcohol Solvent ◽  
Check Test

Abstract A simple and rapid field test is described for the vatside determination of toxaphene and lindane in aqueous emulsions used for the eradication of ectoparasites in livestock. With appropriate modification, the test should also be useful for aqueous emulsions of other chlorinated hydrocarbons. The chlorinated hydrocarbon is “salted-out” of emulsion and extracted into an organic solvent, and the extract is reacted with sodium biphenyl, which strips the molecule of organic halogen. After solution of reaction products in a glycol-alcohol solvent and adjustment of pH, the resultant chloride is titrated with silver nitrate to a pink end point with 2″,7″-dichlorofluorescein. All procedures except extraction are carried out in one vessel and there is no need for special equipment. A field worker can perform an analysis in 15 minutes.

Decomposition of peroxobenzoic acid in benzene catalyzed by transition metal 2,4-pentanedionates

1984 ◽  
Vol 49 (3) ◽  
pp. 673-679 ◽  
Author(s):  
Pavel Lederer ◽  
Eva Mácová ◽  
Josef Vepřek-Šiška
Keyword(s):  
Transition Metal ◽  
Reaction Rate ◽  
Reaction Products ◽  
Acid Decomposition ◽  
Analogous Experiment ◽  
Catalytic Effects

The decomposition of peroxobenzoic acid in benzene was studied, and catalytic effects of Fe(III), Mn(III), Co(II), Co(III), and Cr(III) on the reaction rate and the composition of the reaction mixture were investigated. An analogous experiment carried out in perdeuterobenzene and determination of the distribution of deuterium in the reaction products provided evidence for the participation of the solvent in peroxobenzoic acid decomposition.

Determination of total sulfur in diesel fuel employing NIR spectroscopy and multivariate calibration

The Analyst ◽  
2003 ◽  
Vol 128 (9) ◽  
pp. 1204-1207 ◽  
Author(s):  
Márcia C. Breitkreitz ◽  
Ivo M. Raimundo, Jr ◽  
Jarbas J. R. Rohwedder ◽  
Celio Pasquini ◽  
Heronides A. Dantas Filho ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Multivariate Calibration ◽  
Nir Spectroscopy ◽  
Total Sulfur
Sign in / Sign up

Export Citation Format

Share Document