Bulk deposition in a rural area located around a large coal-fired power station, northeast Spain

被引:54
作者
Alastuey, A
Querol, X
Chaves, A
Ruiz, CR
Carratala, A
Lopez-Soler, A
机构
[1] CSIC, Inst Earth Sci Jaume Almera, E-08028 Barcelona, Spain
[2] CSIC, Inst Coal Chem, Zaragoza 50015, Spain
[3] CEAM, Ctr Estudios Ambientales Mediterraneo, Valencia 46980, Spain
关键词
bulk deposition; sulphate; neutralisation; Mediterranean basin; SO(2) emissions; Saharan intrusions;
D O I
10.1016/S0269-7491(99)00103-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This work focuses on bulk deposition in a rural area located around a large coal-fired power station in northeast Spain. Deposition chemistry was characterised by high concentrations of SO(4)(2-), Ca(2+) and NH(4)(+), which were relatively high when compared with ether rural areas. Monthly bulk deposition evolution of major ions was the result of two superimposed patterns: one pattern related to the volume of precipitation and the other showed the seasonal influence of the major ionic sources. A major local origin was attributed to bulk deposition of SO(4)(2-), NH(4)(+), and Ca(2+), whereas a relatively higher contribution of an external source was deduced for NO(3)(-), Na(+) and Cl(-). The SO(4)(2-) concentrations showed a significant correlation with the local SO(2) emissions. High levels of Ca(2+) were due to the high alkalinity of soils in the study area, although an external origin was attributed to the frequent air mass intrusions from the Sahara. Sources of NH(4)(+) were related to intensive livestock farming in the area. Total suspended particles exert a marked influence over bulk deposition and neutraIisation. Thus, despite the high emissions of SO(2) in the area, neutral pH values have always been attained given that the concentrations of Ca(2+) and NH(4)(+) account for the total neutralisation of NO(3)(-) and SO(4)(2-). (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:359 / 367
页数:9
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