| 翻訳と辞書 |
| Specific Ultraviolet Absorption ： ウィキペディア英語版 |
Specific Ultraviolet Absorption
Ultraviolet light spans a narrow range of wavelengths of the EMR spectrum EMR spectrum subtypes Specific UV absorbance (SUVA) wavelengths have analytical uses in providing metrics to "measure the aromatic character of dissolved organic matter"〔Bourbonniere, 2009〕 by detecting density of electron cloud conjugation which is associated with aromatic bonds (''ibid'').
To derive SUVA, first, UVC light (cf. EMR spectrum subtypes) at 254 nanometers (nm), or 280 nm,〔Bourbonniere, 2009; Holl et al., 2009〕 is measured in units of absorbance per meter of path length, often the sample must be diluted with Ultrapure Water as absorbance can be very high.〔Chantigny et al., 2008〕 As increasing dissolved organic carbon concentration increases absorbance in the UV range, the UV light has to be normalized to the concentration of dissolved organic carbon in mg per L to ascertain differences in the aromatic quality of the water.
Aromatic character is used in the study of dissolved organic matter, from mineral soils, or organic soils, to use as an assay to whether or not dissolved organic carbon in the water is labile, a ready source of energy, or is from a relatively old source of carbon (recalcitrant). However, although a good indicator of aromaticity, caution must be used with determination of reactivity.〔Weishaar et al., 2003〕
Measures of water purity often rely on measuring turbidity, not aromaticity.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Specific Ultraviolet Absorption」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|