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首页> 外文期刊>Environmental toxicology and chemistry >THE EFFECT OF pH ON THE TOXICITY OF ZINC OXIDE NANOPARTICLES TO FOLSOMIA CANDIDA IN AMENDED FIELD SOIL
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THE EFFECT OF pH ON THE TOXICITY OF ZINC OXIDE NANOPARTICLES TO FOLSOMIA CANDIDA IN AMENDED FIELD SOIL

机译：pH对改良田间土壤氧化锌纳米颗粒对念珠菌毒性​​的影响

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The effect of soil pH on the toxicity of 30 nm ZnO to Folsomia Candida was assessed in Dorset field soils with pH_(cac12) adjusted to 4.31, 5.71, and 6.39. To unravel the contribution of particle size and dissolved Zn, 200 nm ZnO and ZnCl_2 were tested. Zinc sorption increased with increasing pH, and Freundlich K_f values ranged from 98.9 (L/kg)~(1) to 333 (L/kg)~(1) for 30 nm ZnO and from 64.3 (L/kg)~(1) to 187 (LAg)~(1) for ZnCl_2. No effect of particle size was found on sorption, and little difference was found in toxicity between 30 nm and 200 nm ZnO. The effect on reproduction decreased with increasing pH for all Zn forms, with 28-d median effective concentrations (EC50s) of 553 mg Zn/kg, 1481 mg Zn/kg, and 3233 mg Zn/kg for 30 nm ZnO and 331 mg Zn/kg, 732 mg Zn/kg, and 1174 mg Zn/kg for ZnCl_2 at pH 4.31, 5.71, and 6.39, respectively. The EC50s based on porewater Zn concentrations increased with increasing pH for 30 nm ZnO from 4.77 mg Zn/L to 18.5 mg Zn/L, while for ZnCl_2 no consistent pH-related trend in EC50s was found (21.0-63.3 mg Zn/L). Porewater calcium levels were 10 times higher in ZnCl_2-spiked soils than in ZnO-spiked soils. The authors' results suggest that the decreased toxicity of ZnCl_2 compared with 30 nm ZnO based on porewater concentrations was because of a protective effect of calcium and not a particle effect.
机译：在pH_（cac12）分别调整为4.31、5.71和6.39的多塞特郡田间土壤中，评估了土壤pH对30 nm ZnO对念珠菌毒性​​的影响。为了揭示颗粒大小和溶解锌的贡献，测试了200 nm ZnO和ZnCl_2。锌的吸附量随pH值的增加而增加，并且30 nm ZnO的Freundlich K_f值范围从98.9（L / kg）〜（1 / n）到333（L / kg）〜（1 / n）和64.3（L / kg） ZnCl_2为〜（1 / n）至187（LAg）〜（1 / n）。没有发现粒径对吸附的影响，并且在30 nm和200 nm ZnO之间的毒性差异很小。对于所有形式的锌，随着pH值的增加，对繁殖的影响均降低，其中28 nm的有效浓度（EC50）为553 mg Zn / kg，1481 mg Zn / kg和30 nm ZnO和331 mg Zn 3233 mg Zn / kg。分别在pH 4.31、5.71和6.39的ZnCl_2 / kg，732 mg Zn / kg和1174 mg Zn / kg。基于孔隙水锌浓度的EC50随着pH值的增加而增加，对于30 nm ZnO从4.77 mg Zn / L至18.5 mg Zn / L，而对于ZnCl_2，EC50中未发现一致的pH相关趋势（21.0-63.3 mg Zn / L） 。 ZnCl_2加标土壤的孔隙水钙含量比ZnO加标土壤高10倍。作者的结果表明，与基于孔隙水浓度的30 nm ZnO相比，ZnCl_2的毒性降低是由于钙的保护作用而不是颗粒作用。

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