番薯中钙含量的微波快速测定法

植物样品的前处理，大都操作繁杂，费时费工，且耗能高。该试验利用微波的高渗透性和快速加热性能，以1 molL盐酸作为提取溶剂，采用微波消解技术，对番薯样品中的钙进行快速提取。以20％的氯化锶作硅、磷等干扰离子的掩蔽剂，用原子吸收分光光度法对所提取钙的含量进行了测定。以番薯样品中钙的含量为考察指标，讨论提取料液比、微波功率、提取时间等因素对钙提取效果的影响。通过正交试验，确定微波提取番薯中钙的最佳工艺条件:料液比1∶70，提取功率440 W，提取时间5 min。与传统直接盐酸提取法对照，测定结果没有显著性差异。试验结果表明，该法具有操作简便、快速、不污染环境、提取效果好、便于推广普及等优点。 

Calcium Content in Sweet Potato by Microwave Fast Determination Method

The pre-treatment of plants samples is rather complicated,time-consuming,cumbersome,and energy-consuming.In this study,the high permeability of microwave heating is used in the digestion and extraction of sweet potato samples with 1 mol/L hydrochloride as a solvent.With the 20 percent of the strontium chloride as the testudo for silicon and phosphorus interference ions,the calcium purity in the sweet potato extract was determined by using atomic absorption spectrometry.The effects of the ratio,the microwave power and the extraction time on the calcium extraction were discussed.Each factor was optimized by orthogonal test:the ratio is 1∶ 70,the microwave-assisted extracting time is 5 min and the extracting power is 440 W.Compared with the conventional method,the microwave-assisted method is simple,less energy-consuming,and less time-consuming.The extraction result is satisfactory,and can be applied to other plant extraction.