Improvements have been in previous least-squares regression analyses of infrared spectra for the quantitative estimaiton of conecntratons of multicomponent mixtures. Spectral baselines are fitted by least-squares methods, and overlaping spectral features are accouted for in the fitting procedure. Selection peaks above a threshold value reduces computation time and data storage requirements. Four weighted least-squares methods incorporating different baseline assumptions were investigated using FT-IR spectra of the three pure xylene ismers and their mixtures. By fitting only regions of the spectra that follow Beer's Law, accurate resulta can be obtained using three of the fitting methods even when baselines are not corected to zero. Accurate results can also be obtained using one of the fits even in the presence of Beer's Law deviations. This is a consequence of pooling the weighted results for each spectral peak such that the greatest weighting is automatically given to those peaks that adhere to Beer's Law. It has been shown with the xylene spectra that semiquantitative results can be obtained even when all the major components are not known or when expected components are not present. This improvements over previous methods greatly expands the utility of quantitative least-squares analyses.
- CIC Photonics, Inc.
- Application of new least-squares methods for the quantitative ...
TOC analyzer for airports
During winter, de-icing processes at airports necessitate storm water and de-icing water management. Especially due to adhesive (sticky) substances, strongly fluctuating concentrations and a lot of chemicals, the monitoring systems itself must be tailor-made to fight this water analysis challenge. LAR `s QuickTOCairport is an application-specific online total organic carbon (TOC) analyzer that meets these tough requirements. The sample is injected via a robot-driven injection system to the oven – without...
Case study - Industrial ASBR wastewater treatment facility, India
This two (2) basin ASBR facility near Mumbai, receives a variety of industrial wastewaters collected from many factories and chemical production facilities.The 10,000 m3/d wastewater plant comprises flow metering, chemical treatment, pH correction, flow splitting, flow equalization with aeration, chemical precipitation and lamella plate clarification, two (2) basin ASBR biological treatment process, and effluent equalization. Waste sludge storage, conditioning and belt press facilities are provided. and the...
Automated Oil Particle Analysis Helps Prevent Gearbox Failures
The major issue for premature failure in wind turbine gearboxes is bearing failure, which leads to gearbox failure. A wind turbine gearbox will not survive if the oil is not clean and especially if the hard ferrous particles are not removed from around the bearings. The LaserNet 230 particle counter and ferrous debris monitor has been shown to be an excellent analytical tool for end users to be able to diagnose wear faults in various machine applications such as gear boxes, engines and transmissions. The wear...
Overview of Rotating Disc Electrode (RDE) Optical Emission Spectroscopy for In-Service Oil Analysis
IntroductionThe basis of modern oil analysis is the use of optical emission spectroscopy (OES) to measure the ppm (parts per million) levels of wear metals, contaminants and additives in oil samples. Whatever else an oil lab may measure, a multi-elemental analysis is the core of in-service oil analysis. This paper gives an overview of Rotating Disc Electrode Elemental Spectroscopy and its use for in-service oil analysis applications. Sometime after World War II, the Denver and Rio Grande Railroad, now defunct,...
Case study - SEAWATCH Vietnam
After a series of marine disasters in Vietnam a project was initiated on the initiative of the United Nations (UN) to improve the typhoon forecasting and warning system, described and defined in the UN report "Strategy and Action Plan for Mitigation Water Disasters in Viet Nam".The United Nations (UN) initiated a plan to mitigate the effects of natural disasters occurring in Vietnam. The UN report "Strategy and Action Plan for Mitigating Water Disasters in Vietnam" recommended several measures to be taken. To...