Priority Substances List Assessment Report for Ammonia in the Aquatic Environment

List of Acronyms and Abbreviations

ACRM:   Aquatic Community Risk Model

CAS:   Chemical Abstracts Service

CDF:   cumulative density function

CEPA:   Canadian Environmental Protection Act

CEPA 1999:   Canadian Environmental Protection Act, 1999

CTV:   Critical Toxicity Value

DO:   dissolved oxygen

EC₂₀:   20% effective concentration

EC₅₀:   median effective concentration

EEV:   Estimated Exposure Value

ENEV:   Estimated No-Effects Value

ET₅₀:   time to 50% effect

IC₂₀:   concentration causing 20% inhibition in exposed organisms

ISCST3:   Industrial Source Complex Short Term model

ISOPART:   Inorganic and Secondary Organic Particle model

LC₁₀:   10% lethal concentration

LC₅₀:   median lethal concentration

LT₅₀:   time to 50% mortality

PM_2.5:   particulate matter less than or equal to 2.5 µm in diameter

PM₁₀:   particulate matter less than or equal to 10 µm in diameter

N:   nitrogen

NH₃:   un-ionized ammonia

NH₄⁺:   ionized ammonia

NPRI:   National Pollutant Release Inventory

PSL:   Priority Substances List

REVEAL:   Regional Visibility Experimental Assessment in the Lower Fraser Valley

U.S. EPA:   United States Environmental Protection Agency

VOC:   volatile organic chemical

WWTP:   municipal wastewater treatment plant