For ferric nanoparticles, at the optimum condition of pH7.4 sodium cacodylate buffer solution, the detection limit of bovine serum albumin ( BSA) is 6.6ng/mL and the linear range locate in 0.02-0.70ug/mL. 纳米铁(Ⅲ)在最佳试验条件下,即pH7.4的二甲砷酸钠缓冲介质中,BSA测定的检测限为6.6ng/mL,线性范围为0.02~0.70μg/mL。