Download Chip Malaysia - May magazine for free from ebookbiz. To download click on the following link. In Downloads On March 19, Enter your password to view comments. There is no excerpt because this is a protected post. CHIP-Download-FEB Article (PDF Available) in Zeitschrift fur Naturforschung B The dynamic emf response curves of the reference electrode chip vs. a commercial.
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In all cases, the chip formation mechanisms remain essentially unaffected by cutting speed, i.
Der prinzipielle Spanbildungsmechanismus wird von der Schnittgeschwindigkeit nicht beeinflusst: Volume 33 , Issue 4. Please check your email for instructions on resetting your password.
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Citing Literature Number of times cited according to CrossRef: Volume 33 , Issue 4 April Pages Related Information. Keywords: colorimetric, microfluidic, sensor, LOC 1.
Introduction The photometric determination of chemical species is one of the key techniques in chemical analysis. If the target species does not absorb radiations in the ultraviolet-visible region, it could be introduced as a limiting reactant in a reaction to produce a colored product. The concentration of the target analyte could be deduced from its absorbance, which follows the Beer-Lambert law over a wide, useful range of concentrations [ 1 , 2 , 3 ].
Nitrate is an anion of significant interest, since it could be hazardous to public health if accumulated in human body in concentrations higher than ppm.
The photometric detection of nitrate is based on the Griess test. In brief, nitrate is reduced to nitrite by means of cadmium in an acidic solution.
Sulfanilamide is added to the nitrite to produce a cation known as diazonium salt. The last step in the test procedure is coupling the salt with N-alpha-naphthyl-ethylenediamine to yield the azo dye, which has a pink color. The intensity of the pink color is correlated to the original nitrate concentration.
Photometric or colorimetric measurements are based on the Beer-Lambert law; in brief, the absorbing ingredient, also known as chromophore, absorbs portion of the radiant energy emitted by a light source. As a consequence, the transmitted light is attenuated to an extent that is directly proportional to the amount of the absorbing species.
Colorimetric determination of chemicals could be more versatile if conducted on a smaller scale, rather than an industrial scale. For field measurements, it is practical to use portable measuring devices that could provide the operator with a rapid quantitative determination of the target compounds.
In addition, miniaturizing detection systems provides the advantages of fast analysis, parallelization, low cost, portability, minute reagent consumption, the possibility of running the system by non-trained public workers, and the option of use in areas of low resource settings [ 14 ]. The detection of nitrate concentration at the micro molar level has been investigated by different research groups.
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Optimization of the detection conditions include adjusting the pH of the analyte, its flow rate, the utilized substrates, and the performance of the light-emitting diode and the photodiode array systems used for the detection purposes.Nun verwenden wie den Sensor, um die Temperatur an unserem Standort aufzuzeichnen. Erica reagiert interaktiv auf die Passanten.
Volume 33 , Issue 4 April Pages Das Tool behandelt auf Wunsch gepackte Archive wie Verzeichnisse. How the slip substrate by oxidation and diffusion.
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