In order to reutilize Fe₂O₃ particles in flue gas from coal-fired power plant as a ferrum nutrient for improving microalgae growth, Na-Citrate was proposed to chelate FeCl₃ derived from Fe₂O₃ and HCl reactions to promote biomass and lipid productivities of Chorella PY-ZU1. Fe-Citrate gave much higher biomass and lipid productivities than FeCl₃, Fe-EDTA, Fe-DTPA and Fe-HEDTA, because organic chelator prevented Fe³⁺ from depositing, lower stability constant resulted in easier dissociation of ferric chelate, smaller chelate facilitated Fe²⁺ (reduced from Fe³⁺) transportation through cell membranes. The biomass growth and photosynthetic capacity of Chorella PY-ZU1 cultivated with Fe-Citrate (converted from Fe₂O₃ particles) medium were similar to those with commercial ferric ammonium citrate medium. The biomass and lipid productivities of Chorella PY-ZU1 cultivated with 5 mg L^-1 Fe-Citrate medium were 1.30 and 1.72 times, respectively, higher than those with FeCl₃ growth medium.

为了将燃煤电厂烟道气中的Fe ₂ O ₃颗粒作为铁质养分用于改善微藻生长，提出了柠檬酸钠将来自Fe ₂ O ₃和HCl反应的FeCl ₃螯合以促进生物量和脂质小球藻PY-ZU1的生产效率。柠檬酸铁比FeCl ₃，Fe-EDTA，Fe-DTPA和Fe-HEDTA具有更高的生物量和脂质生产率，因为有机螯合剂阻止了Fe ³⁺的沉积，较低的稳定常数导致三价铁螯合物更容易解离，而螯合剂更小Fe ²⁺（从Fe ³⁺还原）通过细胞膜运输。柠檬酸铁（由Fe ₂ O ₃颗粒转化）培养的小球藻PY-ZU1的生物量生长和光合能力与商业柠檬酸铁铵培养的相似。用5 mg L ^-1柠檬酸铁盐培养基培养的小球藻PY-ZU1的生物量和脂质生产率分别比用FeCl ₃生长培养基的生物量和脂质生产率高1.37倍。