High-precision and on-line measurement of dissolved organic matter in Electro-Fenton process based on dual wavelength analysis with combination of fluorescence emission and ultraviolet absorption spectroscopy

A novel crankshaft and camshaft measurement system by optoelectronic scanning of which a flat-crystal was used to generate high depth of parallelism scanning laser was implemented. The general structure and principle were given. Mass of test results showed that the system could achieve high precision. The ranges could achieve ±8μm, standard deviation could achieve 3μm, and easy to operate, work reliably, automatically and on line measurement could be implemented.

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Automated microextraction sample preparation coupled on-line to FT-ICR-MS: application to desalting and concentration of river and marine dissolved organic matter

Analytical and Bioanalytical Chemistry ◽

10.1007/s00216-009-3025-0 ◽

2009 ◽

Vol 395 (3) ◽

pp. 797-807 ◽

Cited By ~ 28

Author(s):

Gabriel Morales-Cid ◽

Istvan Gebefugi ◽

Basem Kanawati ◽

Mourad Harir ◽

Norbert Hertkorn ◽

...

Keyword(s):

Organic Matter ◽

Sample Preparation ◽

Dissolved Organic Matter ◽

On Line ◽

Ft Icr Ms ◽

Ft Icr

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Digital signal processor-based high-precision on-line Voigt lineshape fitting for direct absorption spectroscopy

Review of Scientific Instruments ◽

10.1063/1.4903356 ◽

2014 ◽

Vol 85 (12) ◽

pp. 123108 ◽

Cited By ~ 11

Author(s):

Lijun Xu ◽

Chang Liu ◽

Deyan Zheng ◽

Zhang Cao ◽

Weiwei Cai

Keyword(s):

High Precision ◽

Absorption Spectroscopy ◽

Digital Signal Processor ◽

Digital Signal ◽

Direct Absorption ◽

Direct Absorption Spectroscopy ◽

On Line ◽

Signal Processor

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Research on the Measurement System of Large Dimension Workpieces Based on the Technology of CCD and Laser

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.37-38.1101 ◽

2010 ◽

Vol 37-38 ◽

pp. 1101-1104

Author(s):

Xiu Min Yang ◽

Yan Wang ◽

Wei Lun Zhao ◽

Lei Zhang

Keyword(s):

High Precision ◽

Large Dimension ◽

Measure Data ◽

Single Chip ◽

Single Chip Microcomputer ◽

Ccd Sensor ◽

Line Measurement ◽

On Line ◽

Geometry Error ◽

Control Apparatus

A kind of the measurement technique of the dimension and the geometry error of large dimension workpiece with two light routes and two CCD sensors has been made. The mathematical models of the dimension and the geometry error based on the technology of CCD and laser are established. The application property parameter to measure workpiece dimension and geometry error and the design characteristic related supplemental hardware of CCD sensor are studied. An on-line data collection system based on laser and liner array CCD is developed. This systematic C8051 single-chip microcomputer as controler that adopt American CYGNAL company's production carry out handling and the collection of data. the system meets the measurement requirement of no-touch, on line and high precision with adopting of machine, laser and electricity comprehensive technology. The result can be got in this paper: the CCD sensor can meet the need of measuring dimension and geometry error of big workpiece and is no-touch, on line measurement and high precision. The on line collecting data system can achieve the expecting function, and measure data on line, and it also can easily connect with auto control apparatus.

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A real-time on-line measurement of iodine flow rate based on absorption spectroscopy

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2009.02.057 ◽

2009 ◽

Vol 138 (2) ◽

pp. 428-431 ◽

Cited By ~ 1

Author(s):

Guofu Li ◽

Haiyun Yu ◽

Liping Duo ◽

Jian Wang ◽

Yuqi Jin ◽

...

Keyword(s):

Real Time ◽

Absorption Spectroscopy ◽

Flow Rate ◽

Line Measurement ◽

On Line

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Chemical characterization of dissolved organic matter released by limed and unlimed forest soil horizons

Canadian Journal of Soil Science ◽

10.4141/s96-024 ◽

1997 ◽

Vol 77 (3) ◽

pp. 405-413 ◽

Cited By ~ 29

Author(s):

M. Susan Erich ◽

Georgette M. Trusty

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Charge Density ◽

Forest Soil ◽

Negative Charge ◽

Fluorescence Emission ◽

Water Extracts ◽

Forest Practices ◽

Organic Horizons ◽

Negative Charge Density

Liming of forest soils, currently practiced in Europe, may be necessary in the future in North America to counteract calcium (Ca) depletion due to whole tree harvesting. With current concerns over increasing carbon dioxide (CO2) levels in the atmosphere, the effects of forest practices such as liming on carbon (C) cycling in forest ecosystems has been receiving increasing attention. This laboratory study investigated the effect of an increase in pH on dissolved organic matter (DOM) in water extracts of organic horizons. Organic horizons were collected from nine forested sites, some predominantly hardwood and some predominantly softwood stand types. The soils were chemically characterized. Water extracts of limed and unlimed treatments of nine organic horizons were analyzed for pH, Al, Fe, Ca, C, and DOM negative charge density. Total luminescence fluorescence spectra were also obtained for each extract. The addition of lime (CaCO3) to organic horizons caused an average of 55% more C to be released than in unamended samples. Liming caused no significant changes in negative charge density of the DOM. Liming decreased organically-complexed aluminum (Al) and increased organically-complexed Ca. There was a negative correlation between Al concentration of extracts and fluorescence intensity. Chemical changes in the DOM released by liming were suggested by decreased fluorescence emission and excitation wavelengths due to liming. Hardwood samples did not respond differently than softwood samples with respect to DOM concentration, functional group concentration, or spectroscopic characteristics. However, there was a suggestion that particular tree species, such as cedar, may have unique effects on C concentrations and DOM chemistry. Key words: Lime, forest soil, dissolved organic matter, fluorescence

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Acquiring reproducible fluorescence spectra of dissolved organic matter at very low concentrations

Water Science & Technology ◽

10.2166/wst.2009.367 ◽

2009 ◽

Vol 60 (6) ◽

pp. 1385-1392 ◽

Cited By ~ 23

Author(s):

B. R. H. Peiris ◽

H. Budman ◽

C. Moresoli ◽

R. L. Legge

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

High Concentration ◽

Low Concentration ◽

Low Concentrations ◽

Fibre Optic Probe ◽

On Line ◽

Optic Probe ◽

Membrane Treatment ◽

Concentration Levels

A method that would allow for fast and reliable measurements of dissolved organic matter (DOM), both at low and high concentration levels would be a valuable tool for online monitoring of DOM. This could have applications in a variety of areas including membrane treatment systems for drinking water applications which is of interest to our group. In this study, the feasibility of using fluorescence spectroscopy for monitoring DOM at very low concentration levels was demonstrated with an emphasis on optimizing the instrument parameters necessary to obtain reproducible fluorescence signals. Signals were acquired using a cuvette or a fibre optic probe assembly, the latter which may have applications for on-line or in-line monitoring. The instrument parameters such as photomultiplier tube (PMT) voltage, scanning rate and slit width were studied in detail to find the optimum parameter settings required. The results showed that larger excitation and emission slit widths were preferred, over larger PMT voltage or lower scanning rates, to obtain reproducible and rapid measurements when measuring very low concentration levels of DOM. However, this approach should be implemented with caution to avoid any reduction of the signal resolution.

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