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RECEIVED SES' 19 2014 Plants were injured by sodium sulfate levels of 4000 mg/I in soil; 710 mg/I depressed root growth and water absorption. ENVIRONMENTAL HEALTH DEPARTMENT [Environment Canada; Tech Info for Problem Spills: Sodium Sulphate p.41 (1985)] **QC REVIEWED** Crop weight reductions ranging up to 85% have been demonstrated for rice, tomato, and beans with sodium sulfate levels up to 5120 mg/I. [Environment Canada; Tech Info for Problem Spills: Sodium Sulphate p.41 (1985)] **QC REVIEWED** Water containing 4549 to 7369 mg/I of salts, mostly sodium sulfate, was not harmful to cows over a two-year period. However, a sudden change from normal water to this water caused diarrhea. At a level of 7000 mg/I there was some evidence of weight reduction in cattle and at 10,000 mg/I weight losses were severe. [NIH/EPA; OHM/TADS (1986)] **QC REVIEWED** The effect of a long-term application of sulfite, thiosulfate and Na2SO4 on the soil microflora and spruce seedlings was investigated in a pot experiment. Sulfur compounds decreased the bacteria, including thiobacilli, increased the microscopic fungi and sulfate -reducing bacteria; they inhibited respiration, nitrification and oxidation of thiosulfate, stimulated ammonification and oxidation of elemental sulfur. In certain cases the spruce rhizosphere exhibited the opposite effect. In the rhizosphere the sulfate -reducing bacteria were suppressed together with thiobacilli, whose unit oxidative activity increased substantially. Growth of seedlings was inhibited by sulfite and stimulated by thiosulfate and sulfate. Sulfite, the effect of which were similar to those of SO2 emmissions, was the most effective compound. In regions influenced by immisions the soil contained toxic amounts of sulfite. [Lett) A; Folia Microbiol 26 (3): 243-252 (1981)] **QC REVIEWED** The effect of 1 hr oral inhalation exposures to submicrometer aerosols of ammonium bisulfate (NH4HSO4), ammonium sulfate (NH4)2SO4, and sodium sulfate (Na2SO4) upon mucociliary clearance from the bronchial tree of rabbits was examined. Exposures to NH4HSO4 at concentrations of approximately 600 - 1700 micrograms/cu m produced a significant depression of clearance rate only at the highest exposure level. No significant effects were observed with the other sulfates at levels up to approximately 2000 micrograms/cu m. When results were compared to those from another study in this laboratory using sulfuric acid (H2SO4) aerosol, the ranking of irritant potency was H2SO4 greater than NH4HSO4 greater than (NH4)2SO4, NaSO4. Alteration in bronchial mucociliary clearance due to sulfate aerosols appears to be related to the deposition of (H) on the mucus lining of conducting airways. [Schlesinger RB, Environ Res 34 (2): 268-79 (1984)] **QC REVIEWED** Non -Human Toxicity Values: LD50 Rabbit percutaneous > 4.0 g/kg