The absorption of light in distilled water, artificial sea water, and heavy water was measured in the visible region. A Nielsen spectrometer with glass optics was used with a tungsten source and photomultiplier detector. Path lengths were 60.0 and 132.0 cm. The absorption in distilled and artificial sea water differs little; maxima below 745 mµ were too weak to be observed. The absorption in heavy water is very small, increasing from a broad minimum at 700–600 mµ until at 390 mµ it is a factor of 10 larger than the minimum value.
SERAPHIN A. SULLIVAN, "Experimental Study of the Absorption in Distilled Water, Artificial Sea Water, and Heavy Water in the Visible Region of the Spectrum," J. Opt. Soc. Am. 53, 962-967 (1963)