The Impact of Different Dissolution Methods on the Determination of Six Types of Heavy Metals in Soil by Using Atomic Absorption Spectrophotometry
Soil is a valuable resource for humanity and is closely related to human production and life.However,in recent years,the soil has been polluted and damaged in many areas.The main pollutants in soil are copper,lead,zinc,nickel,cadmium,and chromium.When the soil contains heavy metals in excess,it can accumulate in relevant agricultural and forest products,thus affecting product safety.Therefore,it is necessary to quickly,safely,and accurately detect heavy metal elements in soil.This experiment used three methods,namely,electric hot plate digestion method,microwave digestion method,and aqua regia digestion method,to treat soil quality control samples and used atomic absorption spectrometry to measure Cu,Pb,Zn,Ni,Cd,and Cr.The results showed that the correlation coefficient of the standard curve for the three digestion methods was all greater than 0.995,and the detection limits of the methods were all below the standard requirements,meeting the experimental requirements.The precision of microwave digestion and Electric hot plate digestion method was better than that of aqua regia digestion.The the accuracy of microwave digestion and electric hot plate digestion method was higher,with recovery rates all greater than 90%.
Electric hot plate digestion methodMicrowave digestion methodAqua regia digestion methodAtomic absorptionHeavy metals