- IRIS Summary (PDF) (12 pp, 106 K)
- Status: Development of the nitrate (re)assessment has been suspended.
IRIS Assessment Plan for Nitrate and Nitrite (Scoping and Problem Formulation Materials, Suspended)
U.S. EPA. IRIS Assessment Plan for Nitrate and Nitrite (Scoping and Problem Formulation Materials, Suspended). U.S. Environmental Protection Agency, Washington, DC, EPA/635/R-17/331, 2017.
Rebecca Nachman, Ph: 202-564-7564, Email: email@example.com
Nitrate (NO3−) and nitrite (NO2−), naturally occurring anions in the environment, play an essential role in Earth’s nitrogen cycle. Since 1950, human sources of nitrogen have increased substantially, creating a global surplus of nitrate/nitrite that supersedes natural sources by about 30%. Nitrate salts are mainly used as nitrogen fertilizers and in industrial explosives, fireworks, and glass making, whereas nitrites are largely used as preservatives for meat and fish curing and as color fixatives.
|Sep 2017||EPA released the IRIS Assessment Plan (IAP) for Nitrate and Nitrite for public comment and review. [Federal Register Notice Sep 18, 2017]|
|Sep 2017||EPA's Science Advisory Board (SAB) Chemical Assessment Advisory Committee (CAAC) hosted a public meeting on September 27-28, 2017 to discuss the assessment. Information regarding the meeting can be found on the SAB website.|
|Apr 2019||EPA suspended the assessment in fiscal year 2019. It may be restarted as Agency priorities change.|
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