Study on Application of Microwave Acid-digestion in Determination of Metal Elements

Objective A ML S-1200 microwave digestion system is developed for determination of metal elements accurately.Methods Samples from animals,plants,aquatic products,grain,fat,human hair and cosmetics are digested with nitric acid,hydrogen peroxide solution using high-pressure microwave digestion of Milstone.In addition,the accuracy and precision is verified by using national standard substances of tea,cow liver.Results Accuracy of the method is 92%-103% by using the digesting system of nitric acid,hydrogen peroxide solution;the precision of the mothod is 1.2%-8.0%.Conclusion Scientific digesting system and process is developed.It is rapid,sharp,accurate.All technical indexes come to or exceed the requirement of national standard with the value of populizing and applying.