This page provides the answer to the following questions:
When samples are continuously extracted from the process through a direct connection to the analyzer, this is called ON-LINE analysis.
Typical applications for process analyzers are characterized by large flow volumes, a dynamic chemical matrix and a substantial motive to obtain real-time chemical analysis information.
Motives for use of on-line analysis include economic issues, quality control, and regulatory compliance.
This is accomplished by drawing a volume of sample into a flow cell, transmitting known intensities of light through the sample and detecting the intensity of light that remains at each wavelength in the range.
The standard ChemScan® instrument detects light from 200 nm (nanometers) thru 450 nm. Special versions of the instrument can increase the number of wavelengths and extend the range through the visible spectrum.
ChemScan® applies pattern recognition techniques to the full absorbance signature of a sample in order to detect multiple chemical parameters using a single analyzer. A manifold system is used to monitor multiple sample points in a process.
Ions of nutrients, ions of heavy metals that form coordination compounds in water, unsaturated (double bonded or triple bonded) hydrocarbons and aromatics are usually good candidates for analysis using ultraviolet or visible spectrometry.
Chemicals that possess natural absorbance characteristics can be detected directly using primary absorbance techniques. Chemicals that do not possess natural absorbance require the assistance of a reagent for indirect detection using secondary analysis techniques.
ChemScan® has developed many primary and secondary analysis methods that take advantage of the multiple wavelength detection capability to simplify the analysis. ChemScan® can also perform multiple primary and secondary analyses of a sample.
A suite of statistical and mathematical techniques called chemometrics is used to evaluate the combined absorbance from the chemical components in a solution and to isolate the contribution made by the absorbance from a single chemical substance to the overall absorbance signature of the solution.
Municipal Wastewater applications include monitoring and control of nitrification, biological nutrient removal (BNR), phosphate precipitation, denitrification and disinfection processes for secondary wastewater treatment, advanced wastewater treatment and water reuse applications. Specific parameters include:
Applications | Parameters | Product Selection | News
Why ChemScan | Technical Articles | Openings | Contact Us
Resources | F.A.Q. | Product Literature | Subscribe
Site Map | Search Our Site | Home Page
Applied Spectrometry Associates, Inc.
2325 Parklawn Drive, Suite I · Waukesha, WI 53186
Phone: 262-717-9500 · Fax: 262-717-9530
Toll Free: 800-665-7133