大型海藻基生物炭中多环芳烃分布特征及毒性评价  被引量:1

Distribution characteristics and toxicity evaluation of polycyclic aromatic hydrocarbons in macroalgal biochars

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作  者:王琪璐 傅宇 陈琪峰 孙秀梅 李铁军[1,2] 杨承虎 Wang Qilu;Fu Yu;Chen Qifeng;Sun Xiumei;Li Tiejun;Yang Chenghu(Marine and Fisheries Research Institute,Zhejiang Ocean University,Zhoushan 316021,China;Marine Fisheries Research Institute of Zhejiang,Zhoushan 316021,China;Jiangsu Zhongmu Beikang Pharmaceutical Co.,Ltd.,Taizhou 225300,China;Zhejiang Zhouhuan Environmental Engineering Design Co.,Ltd.,Zhoushan 316021,China)

机构地区:[1]浙江海洋大学海洋与渔业研究所,舟山316021 [2]浙江省海洋水产研究所,舟山316021 [3]江苏中牧倍康药业有限公司,泰州225300 [4]浙江舟环环境工程设计有限公司,舟山316021

出  处:《农业工程学报》2022年第15期269-276,共8页Transactions of the Chinese Society of Agricultural Engineering

基  金:国家自然科学基金青年基金(31800430)。

摘  要:研究大型海藻基生物炭中多环芳烃(Polycyclic Aromatic Hydrocarbons,PAHs)分布特征及毒性可为其资源化利用提供重要的依据。该研究利用索氏提取结合气相色谱质谱法分析了不同热解温度(200、300、400、500和600℃)的大型海藻(瓦氏马尾藻(Sagassum vachellianum)、羊栖菜(Sargassum fusiforme)、鼠尾藻(Sargassum thunbergii)、带形蜈蚣藻(Grateloupiaturuturu)、粗枝软骨藻(Chondriacrassicaulis)及孔石莼(Ulvapertusa))基生物炭中16种PAHs含量并对其毒性进行评价。结果表明,大型海藻基生物炭中均能检出PAHs(总量浓度为78.2~2244.2μg/kg),且其生成量整体随热解温度升高先增加后降低。大型海藻基生物炭中PAHs含量均低于欧洲生物炭标准(EuropeanBiochar Certificate,EBC,10.1版)规定的EBC-AgroOrganic等级限量值(4±2)mg/kg。大型海藻基生物炭中PAHs以2环和3环为主,4环PAHs在所有生物炭中均存在,而5环和6环PAHs仅在部分生物炭中被检出。此外,不同大型海藻基生物炭呈现各异的苯并[a]芘毒性当量浓度(BaP-Toxic Equivalence Quantity,TEQ_(BaP))(0.196~46.151μg/kg),其TEQ_(BaP)不仅依赖于生物炭中PAHs含量还与其环数和类型分布有关。在生物炭修复效果且潜在环境风险相近的基础上,结合产率及热解温度耗能,可选择热解温度较低的生物炭材料,为大型海藻基生物炭制备与应用的优化提供重要指导。Biochar has been prevalently recognized as a readily available and environmentally friendly material in recent years.The excellent properties can be a developed pore structure,abundant functional groups,and outstanding cation exchange capacity.Therefore,biochar is often used for the fertilization and/or remediation of water and soil,as well as the long-term sequestration of carbon.Notably,the persistent organic pollutants(e.g.Polycyclic Aromatic Hydrocarbons(PAHs))are inevitably generated to stagnate in the biochar during the pyrolysis stage.The concentrations and characteristics of these PAHs in the biochar vary significantly,according to the biomass feedstock,pyrolysis temperature,and pyrolysis conditions.Macroalgae plays crucial roles in carbon cycling to slow down eutrophication in the coastal sea ecosystems.Macroalgae can be expected to serve as the precursors for deriving biochars,due to the short growth cycle,abundance,and accessibility.Moreover,the conversion of macroalgae biomass to biochar is beneficial to the waste management and resource usage of macroalgae.However,it is still lacking on the content and toxicity of PAHs in the macroalgal biochars.In this study,the macroalgal biochars were produced from the Sagassum vachellianum,Sargassum fusiforme,Sargassum thunbergii,Grateloupia turuturu,Chondria crassicaulis,and Ulva pertusa at different pyrolysis temperatures(200,300,400,500,and 600℃)under oxygen-limited conditions.Sixteen typical PAHs in the macroalgal biochars were extracted and determined using the Soxhlet extraction combined with gas chromatography-mass spectrometry(GC-MS).Their toxicities were evaluated in this case.The results showed that the PAHs were widely distributed in all tested macroalgal biochars.Specifically,the abundance of PAHs in the biochars first increased and then decreased,as the pyrolysis temperature increased.There was the lowest(78.2μg/kg)total concentration of PAHs in the C.crassicaulis biochar that was prepared at 600℃ among the macroalgal biochars.By contrast,the hi

关 键 词:生物炭 热解温度 大型海藻 多环芳烃 毒性当量 

分 类 号:X705[环境科学与工程—环境工程]

 

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