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<br />.. .~- _"..>_'O-~_ .">"""__0 "',:__,,_ <br /> <br />V II -18 <br /> <br />F. Toxic Effects of Ammonia <br /> <br />Ammonia in sufficient concentrations can be very toxic to <br /> <br />aquatic life. <br /> <br />A relationship between total ammonia and non-ionized ammonia <br /> <br />at 0.02 mgll (which is considered the toxic threshold) for various <br /> <br /> <br />temperatures and pH levels was developed by Tom Willingham of the <br /> <br /> <br />EPA Region VIII and is shown in the following graph: <br /> <br />() 25 <br />o <br /> <br />~ 20 <br />::> <br />- <br />" <br />~ <br />~ 15 <br />E <br />~ 10 <br /> <br />35 <br /> <br /> <br /> <br />30 <br /> <br />pH <br /> <br />5 <br /> <br />o <br />0.0 0.5 <br />Allowable Total <br /> <br />1.0 1.5 <br />Ammonia (mg/l) in River <br /> <br />2D <br /> <br />Following is a tabulation of the high ammonia (NH3) concentra- <br />tions and corresponding pH, temperature and allowable ammonia con- <br />centrations for the major sampling stations on the Rio Grande. <br /> <br />" <br /> <br />r, "'''.' (") '9' <br />.,. Cv' <br />