Speciation Distribution of Arsenic in Lotus Analyzed by Liquid Chromatography coupled with Inductively Coupled Plasma Mass Spectrometry
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Abstract:
The speciation distribution of arsenic in lotus was investigated by determining the content of total arsenic and five arsenic species including arsenobetaine (AsB), As(Ⅲ), As(Ⅴ), monomethylarsine (MMA) and dimethyarsine (DMA) in different parts of lotus at different growth stages with different arsenic concentrations environment in this study. The arsenic species were extracted by ultrasound with 1% HNO3 solution at 70℃ for 40 minutes, which were analyzed by Liquid Chromatography coupled with Inductively Coupled Plasma Mass Spectrometry with 25 mmol/L NH4H2PO4 (pH 8.0) as the mobile phase for isocratic elution. The results showed that arsenic species were extracted completely, and baseline separation was achieved within 8 minutes. The inorganic arsenic species ratio of lotus grew in high arsenic environment was higher than that grew in low rsenic environment. The accumulation ability of lotus was better in the period of growth than that in period of root. The ratio of total arsenic and inorganic arsenic in underground parts was higher than that of the above-ground part except lotus root. The ratio of inorganic arsenic decreased in the period of root, where organic arsenic was present in AsB, MMA and DMA . The inorganic arsenic species ratios in lotus root and semen nelumbinis were lower than that in any other parts in the ratio range of 29.03%~45.21%, which would help the food security control.
