Raman measurements of tributyl phosphate after adsorption on silver hydrosols

Gantner, E.; Steinert, D.; Reinhardt, J.

doi:10.1021/ac00285a033

Cited by 24 publications

(4 citation statements)

References 7 publications

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“…Firstly, silver colloids can be easily prepared by reduction of aqueous solutions of silver salts. 12,13,[15][16][17][18][19] Secondly, as the particles are suspended in solution, Brownian m otion will change the population of colloidal particles in the volume probed by the laser, resulting in reduced surface and analyte degradation. The use of silver colloids as SERRS substrates also m eans that a fresh surface can be provided for each analysis.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Stable, Reproducible Silver Colloids for Use as Surface-Enhanced Resonance Raman Scattering Substrates

2002

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A flow system for the production of stable, reproducible batches of silver colloid for use as substrates for surface-enhanced resonance Raman spectroscopy (SERRS) is described. The colloids were prepared by borohydride reduction of silver nitrate and subsequent stabilization was achieved by adding trisodium citrate. The batches of colloid produced were analyzed using UV-visible spectroscopy and their suitability for use as SERRS substrates was assessed using 3,5-dimethoxy-4-(5′-azobenzotriazole)phenylamine as the analyte. SERRS analysis was carried out using a flowcell. Using the method described, batches of silver colloid were prepared that were stable for at least five months and when used as SERRS substrates resulted in a relative standard deviation in SERRS intensity of 3,5-dimethoxy-4-(5′-azobenzotriazole)phenylamine of 6.6% between colloid batches. The robustness of the system for production of stable, reproducible colloids was assessed using experimental design. The final method proposed enables reproducible, time-stable colloid to be made in a simple manner, thus eliminating one of the major problems associated with the use of SERRS detection in analytical procedures.

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Section: Introductionmentioning

confidence: 99%

Preparation of Stable, Reproducible Silver Colloids for Use as Surface-Enhanced Resonance Raman Scattering Substrates

2002

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“…When coal is heated, its structure undergoes chemical and physical changes, and organic fractions are released. These fractions undergo cyclization reactions leading to polycyclic compounds that can exist in gaseous and in solid phases, depending on the surrounding temperature and their molecular volume ( − ). They can exist in the gas phase (<4-ring PAHs), in the solid phase (>6-ring PAHs), or in both phases (four- and five-ring PAHs) in the air depending on their molecular mass ().…”

Section: Introductionmentioning

confidence: 99%

Investigation of Polycyclic Aromatic Hydrocarbons in Fly Ash from Fluidized Bed Combustion Systems

Liu

Xie

Zhao

et al. 2000

Environ. Sci. Technol.

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A laboratory scale fluidized bed reactor and a bench scale 0.1 MW th fluidized bed combustor were used to study the effect of operating conditions on the formation of Polycyclic Aromatic Hydrocarbons (PAHs) in fly ash from fluidized bed combustion systems. A high volatile bituminous coal was chosen to investigate PAH emissions during the entire pyrolysis to oxygen-rich combustion process. During the experiments, the fluidized bed reactor was operated at temperatures between 700 °C and 900 °C, while the excess air ratio was varied from 0 to 1.3. An extraction and GC/MS analysis of PAHs was used in this study. Approximately 40 different PAHs were identified during the tests, of which only a few are specified by the U.S. EPA. The experimental results indicate the majority of the PAHs in the solid phase (bed and fly ash) are derived from the breakdown reactions during the processes of combustion and/or pyrolysis in a Fluidized Bed Combustion (FBC) system, although FBC systems have an efficient solidgas mixing process and relatively long residence time. The total amount of PAHs in the fly ash was much higher than that in the raw coal and in the gas phase. Threeand four-ring aromatic compounds were the major PAHs from pyrolysis conditions, while naphthalene (two-rings) is the dominant compound in bed ash collected from oxygenrich combustion conditions. Only naphthalene was detected in the bed ash in the FBC system. High-speed secondary air (air staging) injected into the freeboard of the FBC system is an effective method for minimizing PAH emissions, along with the other benefits including minimizing NO x and SO x emissions.

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“…They have also applied the technique for the detection of nitro polynuclear aromatic hydrocarbons (13). Specific applications of SERS as Em analytical technique include the determination of copper and zinc phthalocyanine complexes on silver island films ( 14) and of tributyl phosphate after adsorption on silver hydrosols (15). Finally, more recently, Sheng et al (16) have classified silver hydrosols by evaluation of sedimentation upon the SERS signal.…”

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confidence: 99%

Trace determination of nitrogen-containing drugs by surface enhanced Raman scattering spectrometry on silver colloids

Torres¹,

Winefordner²

1987

Anal. Chem.

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Raman measurements of tributyl phosphate after adsorption on silver hydrosols

Cited by 24 publications

References 7 publications

Preparation of Stable, Reproducible Silver Colloids for Use as Surface-Enhanced Resonance Raman Scattering Substrates

Preparation of Stable, Reproducible Silver Colloids for Use as Surface-Enhanced Resonance Raman Scattering Substrates

Investigation of Polycyclic Aromatic Hydrocarbons in Fly Ash from Fluidized Bed Combustion Systems

Trace determination of nitrogen-containing drugs by surface enhanced Raman scattering spectrometry on silver colloids

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