Determination of cadmium,arsenic,mercury,lead and chromium in organic fertilizer by microwave digestion combined with inductively coupled plasma mass spectrometry
Inductively couple plasma mass spectrometry(ICP-MS)was used to compare the extraction effects of wet digestion for 30 min,wet digestion to near-dry and microwave digestion on cadmium,arsenic,mercury,lead and chromium from organic fertilizers,and a method for the determination of multiple heavy metal elements from organic fertilizers for the unified measurement by ICP-MS was established.The results indicated that after the wet digestion to near-dry digestion and microwave digestion,the method quantification and standard value deviation of five heavy metals content in standard material for multielement composition analysis of organic fertilizer(RMH-F001)from standard value were less than 6.3%and 5.7%,respectively,and the estimated values were in line with the standard value range.The stability of data under the treatment of microwave digestion with nitric acid-hydrogen peroxide system was the best,the relative standard deviation was 0.8%-6.8%,the relative deviation was 1.1%-9.0%,relative difference values was 2.2%-18.0%and the standard addition recoveries was 99.4%-102.9%.The microwave digestion combined with ICP-MS could be used as a conventional method for the unified measurement of five heavy metals in organic manure.
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