Add time:09/26/2019         Source:sciencedirect.com

Soil and topical tests were employed to investigate the effect of two N-nitroso metabolites of RDX (HEXAHYDRO-1,3,5-TRINITRO-1,3,5-TRIAZINE (cas 121-82-4)) on earthworm reproduction. The lowest observed effect concentration (LOEC) for cocoon production and hatching was 50 mg/kg for both hexahydro-1-nitroso-3,5-dinitro-1,3,5-triazine (MNX) and hexahydro-1,3,5-trinitroso-1,3,5-triazine (TNX) in soil. MNX and TNX also significantly affected cocoon hatching in soil (p < 0.001) and in topical tests (p = 0.001). The LOECs for cocoon hatching were 1 and 10 mg/kg for MNX and TNX in soil, respectively, and 10 mg/L in the topical test. Greater than 100 mg/kg MNX and TNX completely inhibited cocoon hatching. In soil, the EC20 values for MNX were 8.7 and 8.8 mg/kg for cocoon and juvenile production, respectively, compared to 9.2 and 9.1 mg/kg for TNX, respectively. The EC20 values for the total number of cocoon hatchlings were 3.1 and 4.7 mg/kg for MNX and TNX, respectively, in soil and 4.5 and 3.1 mg/L in the topical test. Both MNX and TNX inhibited cocoon production and hatching, suggesting that they may have a negative affect on soil ecosystems at contaminated sites.

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