State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100000, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100000, China.
Environ Pollut. 2020 Jul;262:114330. doi: 10.1016/j.envpol.2020.114330. Epub 2020 Mar 7.
Antimony (Sb) is a toxic element of global concern. To date, the most previous researches about phytotoxicity of Sb failed to fully consider the effects of soil properties and long-time aging. To address this, the toxicity of exogenous Sb(III) and Sb(V) were studied using the standardized barley root elongation bioassay. The results indicated that in ten soils aged only for 1 d, the EC (concentrations causing 10% inhibition) values were 221-3164 mg kg and 135-4260 mg kg in Sb(III)- and Sb(V)-treated soils, respectively. The EC values (concentrations causing 50% inhibition) were more than the setting highest concentration of 6400 mg kg in half of ten soils. The regression analysis showed that the amorphous Fe oxide and pH were the most foremost single soil factor explaining above-mentioned variance in EC, respectively, which suggested that the dominant soil factors were related to Sb forms. The inclusion of amorphous Mn oxide in above these two simple regression model could best explain the toxicity variance. After aged for 116 and 365 d, the phytotoxicity of Sb in Sb-treated soils significantly decreased and the phytotoxicity were even not found in the majority of Sb(V)-treated soils. The extent of aging varied with soils, and correlation analysis indicated that the aging effects negatively correlated with soil pH and positively correlated with clay and amorphous Al oxide in the Sb(III)-treated test soils.
锑（Sb）是一种受到全球关注的有毒元素。迄今为止，大多数关于锑的植物毒性的研究都未能充分考虑土壤性质和长时间老化的影响。为了解决这个问题，使用标准化的大麦根伸长生物测定法研究了外源 Sb(III) 和 Sb(V) 的毒性。结果表明，在仅老化 1 天的 10 种土壤中，Sb(III)和 Sb(V)处理的土壤中 EC（引起 10%抑制的浓度）值分别为 221-3164mg/kg 和 135-4260mg/kg。EC（引起 50%抑制的浓度）值超过了一半土壤中设定的最高浓度 6400mg/kg。回归分析表明，无定形铁氧化物和 pH 是最主要的单一土壤因素，分别解释了 EC 值的上述变化，这表明主要土壤因素与 Sb 形态有关。在上述两个简单回归模型中加入无定形 Mn 氧化物可以最好地解释毒性变化。老化 116 和 365 天后，Sb 处理土壤中 Sb 的植物毒性显著降低，大多数 Sb(V)处理土壤中甚至没有发现 Sb 的植物毒性。老化程度随土壤而异，相关分析表明，老化效应与土壤 pH 呈负相关，与 Sb(III)处理试验土壤中的粘土和无定形 Al 氧化物呈正相关。
