响应面法优化海带中重金属的脱除工艺

Study on Technology of Removing Heavy Metals from Seaweed by Response Surface Method

摘要:

应用响应面法优化柠檬酸脱除海带中重金属的条件，使海带中重金属含量达到国家标准，为海带的安全食用提供基础。建立海带中重金属脱除的二次多项式模型，对模型分析确定海带重金属脱除的最佳条件为：脱除液pH=2，脱除时间4 h，液料体积质量比125 mL/g。在此条件下海带中Cd、Cr、Pb、As（总砷）的质量分数分别为0.75、0.63、0.81、14.95 mg/kg，脱除率分别为61.14%、58.28%、70.97%、40.70%。

Abstract:

The Cd, Cr, Pb, As content of seaweed exceed the national standard. To make the heavy metal content in seaweed reduce to the national standard and provide basis for safe eating of seaweed, the response surface method was applied to optimize the conditions of the heavy metals removal from seaweed. The quadratic polynomial model of removal of heavy metals in seaweed was established and analyzed, which showed the best conditions of heavy metal removal from seaweed：the pH of removal liquid 2, time 4 h, the ratio of solvent to material 125 mL/g. Under these conditions, the content of Cd、Cr、Pb、As（total As）in seaweed were 0.75、0.63、0.81、14.95 mg/kg and the rate of removal were 61.14%、58.28%、70.97%、40.70%.