A pot experiment was conducted to investigate the effect of three additives – citric acid (CA), polyaspartic acid (PASP), and FeCl3 – on the phytoextraction efficiency of cadmium (Cd) and lead (Pb) by ryegrass (Lolium perenneL.) from artificially contaminated soils with different heavy metal concentrations. The results showed that as the concentration of pollutants increased, the TI (tolerance index) and BCF (bio-concentration factor) of ryegrass gradually increased only when FeCl3 was applied. FeCl3 also exhibited the most significant biomass enhancement and heavy metal accumulation of ryegrass, as well as the highest phytoextraction efficiency in heavily-polluted soils. The overall orders of the optimal phytoextraction efficiency for the three additives in terms of their MER (metal extraction ratio) were: FeCl3 > PASP > CA. Therefore, FeCl3 can be used to improve the Cd and Pb phytoextraction efficiency of ryegrass in heavily-polluted soils.
Zhaohai (KI 6) is a point on the Kidney Channel of Foot Shaoyin, and it is one of the eight confluent points, connecting with the Yinqiao Channel. It is located in the depression of the lower border of the medial malleolus, indicated for the disorders along the distributing courses of the Foot Shaoyin Channel and Yinqiao Channel. Connecting with the kidney and bladder collaterally, it gives the effect of reinforcing the kidney and strengthening qi, and promoting the function of the bladder. 相似文献