Determination of Heavy Metals in Materials of Porphyra haitanensis by ICP-AES with Wet Digestion and Microwave Digestion

The process of microwave digestion of East China Sea Porphyra haitanensis is optimized using the experimental method of response surface. The digestion method of microwave digestion and wet digestion are used to measure the heavy metals by ICP-AES. According to the results, the three factors in the processing are optimally determined as: the temperature of digestion being 164 ℃, the acid solvent to material ratio being 25:1, and the digestion time being 15 minutes. The shorter the digestion is, the simpler operation and the less of regent dosage are. It is concluded that, compared to the method of wet digestion, the method of microwave digestion features in being time-saving in processing, convenient in operation, consumption-saving in dosage, and more effective in ICP-AES.