Determination of Metal Elements in Different Parts of Papaya by Flame Atomic Absorption Spectrometry with Microwave Digestion

In order to explore the contents of metal elements in the papaya pulp,peel and seed,flame atomic absorption spectrometry(FAAS) method was used for determination of K,Na,Ca,Mg,Cu,Fe and Zn in the three parts of papaya.In addition,the digesting conditions were optimized.The results showed that under the optimized microwave digestion conditions and FAAS method,the samples were digested quickly and completely,there was a good linear relation between the concentration of the metal element standards and the absorbance value,the correlation coefficient was 0.995 7-0.999 9,the detection limit was 0.002-0.131,the recovery rate was 98.30%-101.67% and RSD was 0.20%-4.12%(n=6).So microwave digestion-FAAS was a fast good detection method with complete digestion,less interference and stable measurement results.There were more K,Ca,Mg and less Cu,Fe,Zn in the three parts of papaya;there were more K,Mg,Cu,Zn,Fe in papaya peel and seed than in pulp,so papaya peel and seed had more advantage of development in food and medicine.