9348 - Laserfiche WebLink

Home Browse Search

-3- All water samples were collected below the surface in a 250 cc sample bottle and analyses were made at the collection site using a portable chemical analysis field kit. The chemical analyses methods are as follows: Ph Hydrogen-ion concentration was measured with a Rascher and Bechtold colorimetric pH kit using cresol red and bromthymol blue as indicators. Oxy~en The sodium azide modification of the Winkler method, as outlined in the F'Standard Methods of Water Analysis" (1955), was used to determine the dissolved oxygen (D.O.) concentration in-the Colorado River study, while the Winkler method was applied to the Green River Investigations. Results are expressed in parts per million (ppm) of D.O. Carbon dioxide The amount of free carbon dioxide is re- corded as pp;n by titrating 100 cubic centimeters (ce) sample of water with N/41~ Sodium Hydroxide, using phen- olphthalein as an indicator. Alkalinity Phenolphthalein alkalinity was measured by titrating a 100 cc sample of water using ~T/50 Sulfuric acid and again using phenolphthalein as the indicator. These measurements-were converted and expressed as ppm of carbonate by means of a formula given by Welch, 1948= 215, after this reading, methy orange was added to the same sample and again titrated arith the same acid. This reading was also converted and expressed as ppn of bicar- bonate. The physical data were obtained by the following: Location -The exact location of each collection site was obtained by referring to the U.S. Geological Survey maps. Average Width and bepth - Measurements of average width and depth were obtained by estimating the extremely variable conditions. Dolor and Turbidity - Notes on water color were made from observation in the field. The turbidity samples were taken to the University of Utah and measured with a Hellige Turbidimeter. Temt~erature - Temperature measurements were made with a field type thermometer and recorded to the nearest de- gree Farenheit.