Speciation analysis and health risk assessment of aluminum in Porphyra haitanensis

The speciation analysis and health risk assessment of aluminum in Porphyra haitanensis was carried out by sequential chemical extraction method and analyzed by inductively coupled plasma mass spectrometry(ICP-MS).The total content of aluminum was within the limits of 74.3-1 479 mg/kg in 30 samples.The content distribution of aluminum species in P.haitanensis was according to the order of insoluble Al>organic Al>inorganic Al>water soluble Al.Insoluble aluminum in P.haitanensis accounted for about 75% of the total Al.The greatest amount of soluble aluminum existed as organic Al,which accounted for 72% of the total soluble aluminum.The dominating form of inorganic aluminum was Al(OH)₃ and water soluble aluminum only accounted for 18.5% of inorganic aluminum.The percentage of dissolved aluminum in gastric stage only accounted for 1.38%-6.80% of the total aluminum,which indicated most of aluminum was insoluble during digestion process and health risk of aluminum which come from P.haitanensis was low.