| | Journal of the American Water Resources Association: MODELING TOC AND UV-254 ABSORBANCE FOR RESERVOIR PLANNING AND ... (Site not responding. Last check: 2007-10-21) |
 | | Unfortunately, TOC is difficult to measure, and some water utilities rely on the more easily measured absorbance of ultraviolet light (specifically at a wavelength of 254 nm, abbreviated UV-254) as a surrogate indicator of organic content. |
 | | The MWRA has recently developed an empirical method whereby monthly average measurements of the absorbance of ultraviolet light at a wavelength of 254 nm (UV-254, a surrogate for Total Organic Carbon, as discussed below) in the downstream reservoir are used to trigger transfers of water from the cleaner, upstream reservoir (Sung, 2003). |
 | | UV-254 absorbance is measured by shining an ultraviolet light through 10 cm of water and measuring how much of the light is absorbed at a wavelength of 254 nm by material in the water. |
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