John Wiley & Sons, Ltd.

Algal growth stimulation and toxicity in response to exposure to the new insensitive military high‐nitrogen energetic TAG‐MNT

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Triaminoguanidinium‐1‐methyl‐5‐nitriminotetrazolate (TAG‐MNT) is a nitrogen‐rich energetic compound being developed as a potential component of insensitive munition formulations. The purpose of the present study was to assess the toxicity of TAG‐MNT to the green alga Pseudokirchneriella subcapitata as well as to determine if the high N content of TAG‐MNT could result in increased algal growth in aquatic systems and potentially contribute to eutrophication using a 96‐h algal growth bioassay in N‐limited test media. Results were compared to algal exposures to current‐use energetics TNT and RDX. The TNT exposure resulted in a lowest observed adverse effect concentration (LOAEC) for algal growth of 1.72 mg/L and an IC50 and 95% confidence limits of 0.972 mg/L (0.955, 0.973). The RDX algal growth LOAEC was 0.10 mg/L and the RDX IC50 was 0.635 (0.416, 0.875). Neither TNT nor RDX exposure resulted in stimulation of algal growth. In repeated testing, TAG‐MNT exposure resulted in LOAECs of 0.55 and 5.20 mg/L. Stimulation of algal growth was observed at 0.06 mg/L at a mean increase of 163.2% (± 71.7) relative to the control in TAG‐MNT Test A and at the 0.005 mg/L treatment at a mean increase of 174.3% (± 59.9) in TAG‐MNT Test B. Our results indicate the potential for high‐N energetics to significantly stimulate algal growth at low concentrations in N‐limited systems. Environ Toxicol Chem © 2013 SETAC

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