12.1 Toxicity
Toxicity to fish
no data available
Toxicity to daphnia and other aquatic invertebrates
LC50; Species: Daphnia magna (Waterflea) age <24 hr; Conditions: freshwater, static,
20 deg C, pH 8.2, hardness 250 mg/L CaCO3, dissolved oxygen >6.5 mg/L; Concentration
4200 ug/L for 48 hr (95% confidence interval: 3200-5600 ug/L) /formulation
Toxicity to algae
EC50; Species: Chlorella pyrenoidosa (Green Algae) exponential growth phase, 2 X10+8 cells/mL; Conditions:
freshwater, static, 25 deg C, pH 6.6; Concentration
6300 ug/L for 96 hr (95% confidence interval: 4100-9800 ug/L); Effect: population changes, general /formulation
Toxicity to microorganisms
no data available
12.2 Persistence and degradability
AEROBIC
1,2-Dimethyl-3-nitrobenzene, present at 100 mg/L, reached 0% of its theoretical BOD in 4 weeks using an activated sludge inoculum at 30 mg/L in the Japanese MITI test (OECD TG 301C) that suggests the compound is not readily biodegradable(1). This Japanese MITI test yields similar results for 2-methylnitrobenzene and 4-methylnitrobenzene(1); however, other biodegradation screening tests have shown that biodegradation of these compounds in acclimated media (activated sludge, soil, water) can be relatively fast with 98- 100% degradation within a few days to few weeks(2-4).
12.3 Bioaccumulative potential
A log BCF of 2.86 (BCF = 724) for 1,2-dimethyl-3-nitrobenzene was measured in guppies (Poecilla reticulata) during a 3-day static-flow test, measurement based on a fat-weight basis(1). According to a classification scheme(2), this log BCF suggests bioconcentration in aquatic organisms is high(SRC).
12.4 Mobility in soil
Using a structure estimation method based on molecular connectivity indices(1), the Koc of 1,2-dimethyl-3-nitrobenzene can be estimated to be 606(SRC). According to a classification scheme(2), this estimated Koc value suggests that 1,2-dimethyl-3-nitrobenzene is expected to have low mobility in soil.
12.5 Other adverse effects
no data available