the absorption properties of charge transfer organic semiconductor ttf-tcnq (tetrathiafulvalene-tetracyanoquhodimete ) filmsdeposited on kbr singlecrystal, quartz and glass substrates in far infrared have been investigated. an absorption edge at ?10 ??m was observed. photoconductivity, photoconduction efficiency and gain and photocarrier's lifetime have been measured. the results show an e...

Thermal impedance spectroscopy has been investigated as a non-destructive technique to determine the composition of ternary mixtures of biofuels. The principle of the thermal conductivity detector has been extended for measuring both the thermal conductivity and the thermal capacity of biofuel in the range between 1 to 100 Hz, using an AC-operated polysilicon heater for injecting a sinusoidal h...

The concentration of organic and inorganic carbon in seawater is of considerable interest. Some Total Organic Carbon (TOC) analyzers have been designed for straightforward analysis of these waters, with special features to avoid many of the problems found with salty samples. The presence of the chloride ion (Cl) in waters being analyzed for carbon presents problems when the method uses low temp...

1. Survey 1.1. Characteristics to be analyzed 1.2. Concentration Units 1.3. Presentation of Analytical Results 1.4. Quality of Analyses 1.5. Analytical Procedures 2. Flue Gas Sampling 2.1. Sampling Effluents 2.2. Organic Micropollutants Sampling 2.3. Gas Sampling Train 2.4. Sampling of Inorganic Compounds 3. Gas Analyzers 3.1. Survey 3.2. Gas Chromatographic Separation 3.3. Gas Chromatographic ...

In late 1973 a slow release formulation of terbutryne (2-ethylamino-6-methylthio-4-tert.-butylamino-1,3,5triazine) was introduced commercially for the control of water weeds (CIBA-Geigy (Clarosan)). Hence it will be of increasing importance for residue analysts to be able to detect low concentrations of this compound in surface waters. In the work reported here two methods are described, one, h...