Water

A Paper Disk Method for the Spectrophotometirc Microestimation of Inorganic Fluoride.

“…method (Table I). This observation was the opposite of that reported by two other workers (9,10) who found the Adcock method to give somewhat higher yields than the v.f. method.…”

“…Controlling factors appeared to be the intensity of heat treatment with respect to temperature and time, and the concentration of hydrochloric acid used for sample decomposition. These factors had been investigated (10), but were re-examined, and in addition, the effect of sample decomposition temperature and filtration technique was determined.…”

“…of inorganic fluoride have been reviewed by Ma (7), Kay (5) and Thatcher and Kiser (10), and indicate that a number of workers have applied filter paper to the problem. Adams (1) and Robinson (9) reinvestigated limed paper for the determination of fluorine in air, Kielczewski (6) treated filter paper with uranyl ferricyanide, and Yasuda and Lambert (11) impregnated filter paper with an alizarin sulfonate solution containing thorium nitrate.…”

Photolytic determination of trace amounts of organic material in water

“…Traps B and J are used to condense water vapor and to isolate the system from the vacuum pump, respectively. The vacuum pump is connected beyond stopcock M, and tank nitrogen, which is passed through Ascarite and a calcium chloride drying chamber, is introduced through Cold trapsj 8 Immersed in dry ice-acetone and J in liquid nitrogen C, F, , l, M,.N. High vacuum oblique 4-mm.…”

“…Allen and Holroyd (8) have reported that the initial rapid rate of peroxide production in aerated water when irradiated with Co10 radiation appears to be due to organic impurities in the water. The water was decomposed to hydrogen and hydroxyl radicals by the radiation; peroxide was formed by the reaction of hydrogen atoms with dissolved oxygen and hydroxyl destroyed the peroxide.…”