The tartaric acid method of Wattenberg as modified by 

 Cooper was used to determine ammonia-nitrogen on cruises made 

 in 1956 (Wattenberg, 1937), Tartaric acid was added to the 

 sample after removal from the Nansen bottles to prevent the 

 formation of a precipitate on the addition of Nessler's 

 reagent. A colorimetric comparison with standards of known 

 ammonia concentration was then made. Ammonia-free sea water 

 was used in the preparation of the standards. Previous deter- 

 minations had been made by the method of Witting-Buch, These 

 proved unsatisfactory as some of the samples became turbid 

 when the reagents were added after the necessary three day 

 storage o 



The dissolved oxygen in sea water was determined by the 

 Pomeroy-Kirschman modification of the Winkler method (Pomeroy 

 and Kirschraan, 1945). Manganous sulfate and sodium iodide 

 added to the water sample liberated iodine equivalent to the 

 oxygen dissolved in the water. The quantity of iodine is then 

 determined by titration with sodium thiosulfate. The 52 ml 

 samples were drawn in glass-stoppered bottles of exact volume, 

 immediately treated with the reagents, and titrated within 

 ten minutes of recovery in the Nansen bottles. 



Orange County Outfall 



The vertical and horizontal distribution of nutrients is 

 simplest around the Orange County outfall where the effluent 

 rises directly to the surface with no benefit from diffusion. 

 In Figure 1 are shown the average nutrient values versus dis- 

 tance from the outfall on December 19 and 20, 1955. The 



