Accuracy and Precision

To describe a position in the absorption spectrum the wavelength is used as the locating unit. This puts a high demand on the spectrophotometric measurements, especially accuracy, precision and reproduci-bility, of the wavelength. The weekly calibration of the wavelength scale of GC-UV Inscan 175 spectro-photometer, using the spectral lines from a mercury-argon pen lamp, always gave the same wavelength values of the spectral lines measured in the region of 168-330 nm. The 1024 element photodiode array covers the scale from 166.7 to 330.0 nm. This gives a value of 0.16 nm per diode, which is to be considered as an ultimate limit of resolution. The reproducibility was measured for different bands of 1-hexene (Xmax 178.7 nm), 1-hexadecene (Xmax

177.9 nm) and 1-iodopropane (the band at X: 177.6 nm, at Xmax: 182.7 nm and the band at X: 199.4 nm) for 1 year. The standard deviation values were in the range of 0.05-0.15 nm, i.e. all were lower than the distance between two diodes (0.16 nm).

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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