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Arsenic and cadmium in the marine macroalgae (Porphyra yezoensis and Laminaria Japonica) - forms and concentrations

文献类型: 外文期刊

作者: Zhao, Yanfang 1 ; Shang, Derong 1 ; Ning, Jinsong 1 ; Zhai, Yuxiu 1 ;

作者机构: 1.Chinese Acad Fishery Sci, Yellow Sea Fishery Res Inst, Qingdao 266071, Peoples R China

2.Natl Ctr Qual Supervis & Test Aquat Prod, Qingdao 266071, Peoples R China

关键词: total arsenic;inorganic arsenic;cadmium;chemical forms;macroalgae

期刊名称:CHEMICAL SPECIATION AND BIOAVAILABILITY ( 影响因子:2.077; 五年影响因子:2.413 )

ISSN:

年卷期:

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收录情况: SCI

摘要: Total arsenic, inorganic arsenic (iAs), total cadmium concentrations and chemical forms of cadmium were analysed in Porphyra yezoensis collected monthly from January to April in 2011 and in Laminaria Japonica collected monthly from March to July in 2010. Results showed that total As concentrations in P. yezoensis were much lower than those in L. Japonica. The iAs concentrations in both macroalgae were all below the maximum limit according to the legislation in China, while total Cd concentrations in all samples of P. yezoensis exceeded the maximum limit. The percentage of iAs to total As decreased in both macroalgae with the time. The results provide important information showing that both macroalgae are able to metabolise inorganic arsenic to organic forms. Thus both macroalgae have evolved arsenic resistance which is linked to the capability of metabolising toxic inorganic arsenic. In addition, the results suggest that the transformation rate of arsenate to organic arsenic in both algae increases with the growth and metabolic rate that increase with elevated environmental temperature. Temperatures rise from January to April in Jiangsu province and from March to July in Liaoning Province. Most Cd was associated with pectates and protein (extractable by 1 M NaCI) in both algae, and only a small percentage of the Cd was inorganic (extractable by 80% ethanol). The Cd chemical forms have no obvious relationship with the time in both algae.

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