...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Solubility and Toxicity of Antimony Trioxide (Sb_2O_3) in Soil
【24h】

Solubility and Toxicity of Antimony Trioxide (Sb_2O_3) in Soil

机译：三氧化二锑（Sb_2O_3）在土壤中的溶解度和毒性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Antimony trioxide (Sb_2O_3) is a widely used chemical that can be emitted to soil. The fate and toxicity of this poorly soluble compound in soil is insufficiently known. A silt-loam soil (pH 7.0, background 0.005 mmoi Sb kg~(-1)) was amended with Sb_2O_3 at various concentrations. More than 70% of Sb in soil solution was present as Sb(V) (antimonate) within 2 days. The soil solution Sb concentrations gradually increased between 2 and 35 days after Sb_2O_3 amendment but were always below that of soils amended with the more soluble SbCl_3 at the lower Sb concentrations. The soil solution Sb concentrations in freshly amended SbCl_3 soils (7 days equilibration) were equivalent to those in Sb_2O_3-amended soils equilibrated for 5 years at equivalent total soil Sb. Our data indicate that the Sb solubility in this soil was controlled by a combination of sorption on the soil surface, Sb precipitation at the higher doses, and slow dissolution of Sb_2O_3, the latter being modeled with a half-life ranging between 50 and 250 days. Toxicity of Sb to plant growth (root elongation of barley, shoot biomass of lettuce) or to nitrification was found in soil equilibrated with Sb_2O_3 (up to 82 mmol Sb kg~(-1)) for 31 weeks with 10% inhibition values at soil solution Sb concentrations of 110 μM Sb or above. These concentrations are equivalent to 4.2 mmol Sb per kg soil (510 mg Sb kg~(-1)) at complete dissolution of Sb_2O_3 in this soil. No toxicity to plant growth or nitrification was evident in toxicity tests starting one week after soil amendment with Sb_2O_3, whereas clear toxicity was found in a similar test using SbCI_3. However, these effects were confounded by a decrease in pH and an increase in salinity. It is concluded that the Sb(V) toxicity thresholds are over 100-fold iargerthan background concentrations in soil and that care must be taken to interpret toxicity data of soluble Sb(III) forms due to confounding factors.
机译：三氧化二锑（Sb_2O_3）是一种广泛使用的化学物质，可排放到土壤中。这种难溶于水的化合物在土壤中的命运和毒性尚不清楚。用不同浓度的Sb_2O_3改良了粉壤土（pH 7.0，本底0.005 mmoi Sb kg〜（-1））。在两天内，土壤溶液中超过70％的Sb以Sb（V）（锑酸盐）的形式存在。在Sb_2O_3修正后的2至35天之间，土壤溶液中Sb的浓度逐渐增加，但始终低于以较低Sb浓度的可溶性SbCl_3修正的土壤。新改良的SbCl_3土壤（平衡7天）中的土壤溶液Sb浓度等于在等效总土壤Sb下平衡5年的Sb_2O_3改良土壤中的浓度。我们的数据表明，Sb在土壤中的溶解度受土壤表面吸附，较高剂量下的Sb沉淀和Sb_2O_3缓慢溶解的共同作用所控制，后者的半衰期为50至250天。在用Sb_2O_3（达82 mmol Sb kg〜（-1））平衡的土壤中31周，发现Sb对植物生长（大麦的根系伸长，生菜的生物量）或硝化作用的毒性，对土壤的抑制值为10％溶液中的Sb浓度为110μMSb或更高。当Sb_2O_3完全溶解在土壤中时，这些浓度相当于4.2 kg Sb / kg土壤（510 mg Sb kg〜（-1））。在用Sb_2O_3改良土壤后一周开始的毒性试验中，没有发现对植物生长或硝化的毒性，而在类似的试验中，使用SbCI_3则发现明显的毒性。但是，这些影响被pH降低和盐度增加所混淆。结论是，Sb（V）毒性阈值是土壤中背景浓度的100倍以上，由于混杂因素，必须注意解释可溶性Sb（III）形式的毒性数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号