不同工艺阶段味精废水对作物种子发芽和根伸长的毒性效应

为了对味精废水的污染进行全面的评价，针对不同工艺阶段排放的味精废水，采用小麦、白菜和西红柿等作物种子，以污水为环境介质,进行了种子发芽和根伸长的污染暴露实验，并结合污染现场,进行了相应的定量分析.结果表明，在高浓度原味精废母液中, 小麦种子的发芽抑制率和根伸长的抑制率与废水的浓度呈显著正相关.味精废水对3种作物种子的发芽和根伸长的毒性强弱顺序为：西红柿＞白菜＞小麦西红柿对味精废水毒性响应最为敏感，可以认为是一种较为理想的生物毒性指示作物.味精生产不同工艺阶段所排放的污水对这3种作物种子的发芽半抑制浓度(IC₅₀)为22.0～32432 mg·L^-1，对根伸长的半抑制浓度(IC₅₀)为17.3～3320 mg·L^-1.

Toxic effects of monosodium glutamate wastewater on crop seed germination and root elongation

To make a comprehensive assessment on monosodium glutamate wastewater pollution, a pollution exposure experiment was carried out on the seed germination and root elongation of wheat, Chinese cabbage and tomato by using the wastewater discharged from different processing phases of monosodium glutamate production. The results showed that there were significantly positive linear relationships between the inhibition rates of wheat seed germination and root elongation and the COD(Cr) of mother liquor scraps. The toxicity of monosodium glutamate wastewater to the test crops was in the order of tomato > Chinese cabbage > wheat, indicating that tomato was most sensitive to the wastewater, and could be considered as an ideal toxic bioindicator. The half-effect concentration (IC50) based on the seed germination and root elongation of test crops exposed to the wastewater discharged from various processing phases of monosodium glutamate production was 22.0 to approximately 32432 mg x L(-1) and 17.3 to approximately 3320 mg x L(-1), respectively.