摘要
为了进一步提高大米中重金属镉的脱除率,快速缓解镉超标大米的利用问题,该文采用酸溶-发酵技术脱除大米中的重金属镉,在前期研究的基础上,固定发酵技术参数,研究酸浸条件对镉脱除率的影响。结果表明:乳酸溶液为大米粉浸泡液,浸泡时间12 h,响应面法优化得到的最佳工艺条件为浸泡温度44.2℃,酸液体积分数48%,液料比9∶1(mL∶g);在最佳工艺条件下处理镉含量为0.647 9 mg/kg的大米,镉的脱除率可达98.01%,与模型预测值相近,且大米粉中镉的残留量远低于国家限量标准。因此,该方法不仅能有效提高大米中重金属镉的脱除率,还能为解决镉超标大米的利用问题提供一定的技术支持。
In order to further improve the removal rate of cadmium in rice and rapidly relieve the cadmium excessive rice utilization, in the paper, the heavy metal cadmium in rice was removed by acid leaching-fermentation technology. On the basis of previous researches, fermentation parameters were fixed, the effect of acid leaching conditions on the removal rate of cadmium was studied. The results showed that lactic acid was selected as suitable leaching solution from seven kinds of acids, and leaching time was selected as 12 h. The optimum acid leaching conditions were obtained with leaching temperature 44.2 ℃, acid concentration 48%, liquid-solid ratio 9：1 （ml：g） by response surface method. Under the optimal conditions, rice with 0.647 9 mg/kg cadmium was treated, and the cadmium removal ratio was 98.01%, which was close to the predictive value. And the cadmium residue content in processed rice powder was much lower than the National limits. Thus, this method not only can efficiently improve the removal rate of cadmium in rice, but also could provide a certain technical support to resolve the problem of cadmium excessive rice utilization.
出处
《中国酿造》
CAS
北大核心
2015年第10期62-67,共6页
China Brewing
基金
湖南省高等学校"2011"协同创新中心项目(湘教通[2013]448号)
长沙市科技重大专项(K404036-21)
"重金属污染耕地治理修复机理及技术模式优化集成"项目(农办财函[2015]38号)
关键词
酸溶技术
镉
大米
发酵
响应面法
acid leaching technology
cadmium
rice
fermentation
response surface method
