Study on the Influence of Different Digestion Methods on the Determination of Heavy Metals in Soil and Sediment
Sample pretreatment is an effective method to improve the accuracy of measurement results,and different digestion methods may affect the determination of heavy metal content in soil and sediment.Microwave digestion and electric heating plate digestion are two commonly used digestion methods.The flame atomic absorption spectrophotometry is used to determine the content of copper,lead,zinc,nickel,and chromium in soil and sediment,and the effects of two commonly used digestion methods are compared on the determination results in the experiment.The results indicate that both digestion methods can meet the requirements of daily work detection.Among them,the electric heating plate digestion method has a long digestion time,high personnel and time costs,and when achieving the same pretreatment effect,it requires a larger amount of acid than the microwave digestion method,and the acid mist and exhaust gas generated are more harmful to the environment and personnel;microwave digestion method has the advantages of short time,low reagent dosage,good digestion effect,especially fully digesting for samples with high organic matter content,the accuracy and precision are high,and the spiked recovery rate is good.
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维普
