OBJECTIVE To establish ICP-MS method for determine the contents of 20 elements in Fresh Bamboo Juice,and investigate differences between different origins and processing methods.METHODS After microwave digestion of samples,20 elements were determined by ICP-MS.RF power is 1510W,sampling depth is 7.6mm,carrier gas flow rate is 0.8L·min-1,auxiliary gas flow rate is 0.35L·min-1,pump speed is 0.10r·s-1,ion lens 1∶3.5V,ion lens 2:-99.5V.The reaction mode was helium mode with a helium flow rate of 4.5mL·min-1.RESULTS The correlation coefficients of the linear equations for 20 elements were 0.9992～0.9999,the recoveries were 95.3％～107.6％,the detection limits of all elements were between 0.06 and 10.2ng·mL-1,the precision,repeatability and stability were higher.CONCLUSION The contents of Mg,K,Ca,Mn,Fe and Zn in Fresh Bamboo Juice were the highest.The contents of Mg,K,Ca,Mn,Fe and Zn in Fresh Bamboo Juice by traditional direct firing process were generally higher than that in modern dry distillation process,and those in Jiangxi Province were generally higher than those in Huaihua,Hunan Province.Pb,As and Cr were detected in traditional direct firing process,while Cr was detected in modem dry distillation process only.Combined with daily intake analysis,Pb and As elements were higher than PDE according to the daily maximum intake,indicating a risk of ingestion.
维普
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