Chloramination and nutrient monitoring


This page provides the answer to the following questions:

A PROCESS ANALYZER is an analytical instrument used to automatically measure the chemical content of samples extracted from a variable process, for process monitoring or process control purposes.
When samples are continuously extracted from the process through a direct connection to the analyzer, this is called ON-LINE analysis.

How are process analyzers USED?
ChemScan® Process Analyzers are used to measure multiple chemicals at municipal drinking water treatment plants and municipal wastewater treatment plants or in an industrial process involving liquids.
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.

How is ChemScan® unique?
The ChemScan® Process Analyzer can be thought of as an on-line ultraviolet-visible spectrometer, designed to collect the full absorbance signature of a sample at 256 wavelengths.
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.

What kinds of CHEMICALS can ChemScan® detect?
ChemScan® can detect any chemical substance that absorbs light in the ultraviolet or visible wavelength range. Absorbance in this wavelength range is typically associated with the bond structures of specific molecules.
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.

How are the chemicals ANALYZED?
The absorbance signature (shape, wavelength range and intensity) is unique for each chemical substance that absorbs light. When the change in intensity for the signature is proportionate to a change in concentration, the substance is said to follow Beer's Law. The absorbance signature for a solution is a function of the combined absorbances from all absorbing chemicals in the solution.
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.

What are typical ChemScan® APPLICATIONS?
Municipal Water applications include control of water blending, chemical feed control, ion exchange breakthrough monitoring, filtration monitoring and disinfection control. Specific parameters include:
NITRATE analysis
IRON analysis
COLOR analysis
NATURAL ORGANIC MATTER (NOM) analysis (TOC equivalent)
CHLORINE analysis
PHOSPHATE analysis
UV-254 analysis
TURBIDITY analysis
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:

NITRATE analysis
NITRITE analysis
AMMONIA analysis
PHOSPHATE analysis
ORGANICS analysis (TOC/COD equivalent)
CHLORINE analysis


ASA Analytics, 2325 Parklawn Drive, Suite I, Waukesha, WI 53186 PH 262-717-9500, FAX 262-717-9530

ASA Analytics is your source for Water Analyzers, Wastewater Analyzers, Analytical Instruments, Spectrophotometric; Titration; Analytical Instruments, Ultraviolet (UV); Analytical Instruments, Water/Wastewater; Chloramine sensor; Continuous Flow Analyzer; Groundwater Treatment, Monitoring Instrument; Instrumentation Toxicity; Instrumentation, BOD; Instrumentation, Chlorine Residual; Instrumentation, Chlorine Testing; Instrumentation, COD; Instrumentation, TOC, TOD; Instrumentation, Water Quality Monitoring; Monitoring Systems; Multiparameter Sensors; Respirometers; Security Sensors & Systems; Water Analysis Products

| Parameters| ChemScan | Accessories | Service | Parts | Search | Contact |

© ASA Analytics | All Rights Reserved |