Lab of Land Contamination Assessment and Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Science (CAS), Beijing 100101, China.
Chemosphere. 2013 Oct;93(4):661-7. doi: 10.1016/j.chemosphere.2013.05.083. Epub 2013 Jul 18.
Panax notoginseng (Burk.) F.H. Chen, a rare traditional Chinese medicinal herb, is a widely used phytomedicine used all over the world. In recent years, the arsenic contamination of the herb and its relative products becomes a serious problem due to elevated soil As concentration. This study aimed to evaluate the effects of different types and dosages of amendments on As stabilization in soil and its uptake by P. notoginseng. Results showed that comparing to control treatment, the As concentrations of P. notoginseng declined by 49-63%, 43-61% and 52-66% in 0.25% zero-valent iron (Fe(0)), 0.5% bauxite residue, and 1% zeolite treatment, respectively; whereas the biomasses were elevated by 62-116%, 45-152% and 114-265%, respectively. The As(III) proportions of P. notoginseng increased by 8%, 9%, and 8%, and the transfer factors of As from root to shoot increased by 37%, 42% and 84% in the optimal treatments of Fe(0), bauxite residue, and zeolite. For soil As, all the three amendments could transform the non-specifically adsorbed As fraction to hydrous oxides Fe/Al fractions (by Fe(0) and red mud) or specifically adsorbed As fraction (by zeolite), therefore reduced the bioavailability of soil As. With a comprehensive consideration of stabilization efficiency, plant growth, environmental influence, and cost, Fe(0) appeared to be the best amendment, and zeolite could also be a good choice. In conclusion, this study was of significance in developing As contamination control in P. notoginseng planting areas, and even other areas for medicinal herb growing.
三七（Panax notoginseng (Burk.) F.H. Chen），一种珍稀的传统中药材，作为一种被广泛应用于世界各地的植物药。近年来，由于土壤砷浓度升高，该草药及其相关产品的砷污染问题变得十分严重。本研究旨在评估不同类型和剂量的改良剂对土壤中砷的稳定化及其对三七吸收的影响。结果表明，与对照处理相比，在 0.25%零价铁（Fe(0)）、0.5%铝土矿渣和 1%沸石处理中，三七中的砷浓度分别降低了 49-63%、43-61%和 52-66%；而生物量分别增加了 62-116%、45-152%和 114-265%。三七中砷（III）的比例分别增加了 8%、9%和 8%，Fe(0)、铝土矿渣和沸石的最佳处理中，根到茎的砷转移系数分别增加了 37%、42%和 84%。对于土壤砷，三种改良剂都可以将非特异性吸附的砷转化为水合氧化物 Fe/Al （由零价铁和赤泥）或特异性吸附的砷（由沸石），从而降低土壤砷的生物有效性。综合考虑稳定效率、植物生长、环境影响和成本，零价铁（Fe(0)）似乎是最好的改良剂，沸石也可以是一个不错的选择。综上所述，本研究对开发三七种植区乃至其他药用植物种植区的砷污染控制具有重要意义。
