其他题名The concentration and composition characteristics of soluble parent and alkylated polycyclic aromatic hydrocarbons in typical bituminous coals
孙溶; 陈颖军; 韩勇; 田崇囯; 李军; 张干
发表期刊地球化学
ISSN0379-1726
2017-07-26
卷号46期号:4页码:358-366
关键词PAHs extraction yieldparent PAHsalkylated PAHscomposition characteristicvolatile matter contentPAHs可抽提率母体多环芳烃烷基多环芳烃组成特征挥发分含量
产权排序(1) 中国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室; (2) 中国科学院大学; (3) 同济大学环境科学与工程学院; (4) 中国科学院广州地球化学研究所有机地球化学国家重点实验室
作者部门海岸带环境过程实验室
英文摘要Residential coal combustion (RCC) is the most important emission source of polycyclic aromatic hydrocarbons (PAHs) and black carbon (BC) in China. Their emission factors are obviously controlled by the geological maturity of coals, therefore they may be related with the concentration and composition of soluble PAHs in coals. Six types of bituminous coal differing in maturity were selected in this study to determine soluble PAHs by GC/MS after Soxhlet extraction with DCM solvent. Through analyzing 16 parent PAHs (pPAHs) and 16 alkylated PAHs (aPAHs), the paper discussed the relationship between the concentration and composition of PAHs and coal maturity. Moreover, it may be helpful to study the formation mechanism of PAHs and BC during RCC. The results show that: (1) the total PAH concentrations in the six tested coal types are within the range of 39.8~289.0 mg/kg,and the coals with a medium volatile material content on the dry and ash-free basis (V_(daf)) have higher PAHs than those V_(daf) bituminous coals with high and low volatile material contents. Various coals show a difference by seven times, which is similar to the trend of emission factors of PAHs and BC of RCC; (2) pPAHs concentrations are winthin the range of 8.3~58.4 mg/kg in the six coal types, with the highest value occurring in those coals with a V_(daf) range of 25.6%~30.5%. Their aPAHs are within the range of 31.4~236.5 mg/kg, with two peaks existing at V_(daf) values within the range of 25.6% and 35.5%, respectively; the concentrations of aPAHs are higher than those of pPAHs by four times on average. The similar ranges of PAHs concentrations in both raw coals and RCC smoke as well as higher alkylated PAHs than pPAHs, may illustrate the succession of PAHs in coal smoke from soluble compounds; (3) as for the composition, low-ringed compounds (2~3 rings) are dominated by pPAHs in coals with V_(daf) less than 25.6%, while middle-to high-ringed PAHs (4~6 rings) have dominatedly the concentrations at V_(daf) over 30%; the case is similar for aPAHs with respect to this similarity, in which 2~3-ringed compounds are the main part in bituminous coals with middle to high maturities, while 4-ringed compounds have the highest concentrations at V_(daf) of 30.5%~35.5%. This compositional trend of soluble PAHs reflects the evolution rule of geological maturity of coal chemical structure y, and it also explains, to some extent, the phenomenon of the highest emission factors of PAHs and BC for middle volatile bituminous coals during RCC.
中文摘要民用燃煤是我国最重要的多环芳烃(PAHs)和黑碳(BC)排放源,但排放因子明显受控于煤的地质成熟度,可能与煤中游离态PAHs的含量和组成相关。本研究选择6种不同成熟度的烟煤(干燥无灰基挥发分含量V_(daf)为19.4%~48.3%),以二氯甲烷为溶剂进行索氏抽提获得煤中游离态PAHs,通过气相色谱-质谱联用仪(GC-MS)进行分析检测,获得16种优控母体PAHs (pPAHs)和16种烷基PAHs (aPAHs)的含量和组成特征,并探讨PAHs的含量和组成及与煤成熟度的关系,为研究民用燃煤PAHs和BC的生成机理提供支持。结果表明:(1) 6种烟煤中PAHs的总含量为39.8~289.0 mg/kg,中等挥发分烟煤(V_(daf)为25.6%~35.5%)明显高于高挥发分和低挥发分烟煤,不同烟煤之差可达7倍,这与民用燃煤排放PAHs和BC的情况相似;(2) 6种烟煤中pPAHs的含量范围为8.3~58.4 mg/kg,在V_(daf)为25.6%~30.5%时最高;aPAHs的含量为31.4~236.5 mg/kg,在V_(daf)为25.6%和35.5%时呈双峰分布;aPAHs含量平均比pPAHs高4倍,这种趋势以及PAHs含量范围与煤烟成分基本一致的情况,说明民用燃烧条件下煤烟成分对原煤游离态PAHs有较好的继承;(3)组成方面: pPAHs在V_(daf)为25.6%以下时以低环(2~3环)为主,而在V_(daf)高于30%时以中高环(4~6环)为主;aPAHs的情况相似,即中高成熟度烟煤以低环为主,而4环aPAHs在V_(daf)为30.5%~35.5%最高;PAHs组成上的这种变化趋势很好地反映了煤化学结构随成熟度演变的规律,也能较好地解释中等挥发分烟煤PAHs和BC排放因子最高的现象。
文章类型Article
收录类别CSCD
语种中文
关键词[WOS]Geology
研究领域[WOS]Geology; 地质学
CSCD记录号CSCD:6036900
引用统计
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/24261
专题中科院海岸带环境过程与生态修复重点实验室_海岸带环境过程实验室
作者单位1.中国科学院烟台海岸带研究所海岸带环境过程与生态修复重点实验室;
2.中国科学院大学;
3.同济大学环境科学与工程学院;
4.中国科学院广州地球化学研究所有机地球化学国家重点实验室
推荐引用方式
GB/T 7714孙溶,陈颖军,韩勇,等. 典型烟煤中游离态母体及烷基多环芳烃的含量和组成特征[J]. 地球化学,2017,46(4):358-366.
APA孙溶,陈颖军,韩勇,田崇囯,李军,&张干.(2017).典型烟煤中游离态母体及烷基多环芳烃的含量和组成特征.地球化学,46(4),358-366.
MLA孙溶,et al."典型烟煤中游离态母体及烷基多环芳烃的含量和组成特征".地球化学 46.4(2017):358-366.
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