摘要
以2006年广州市白云山降水监测资料为基础，对其降水样品的化学特征进行了分析。结果表明，白云山降水样品pH值分布为3.04—6.41，雨量加权pH平均值为4.26，酸雨频率为70.2％，降水中的主要阳离子是Ca^2＋和NH^＋4分别占阳离子总量的46.4％和17.5％；主要阴离子为SO^2-4和NO^-3，分别占阴离子总量的59.0％和19.9％。相对酸度（FA）和中和因子（NF）计算结果表明，约有84.7％的降水酸度被碱性成分Ca^2＋和NH^＋4中和。利用富集系数方法，计算结果表明SO^2-4和NO^-3主要来源于人类活动，而Ca^2＋和K^＋主要来源于岩石／土壤风化。
The chemical characteristic of wet precipitation was studied at Mountain Baiyun, Guangzhou on the basis of monitoring data in 2006. The rainwater was typically acidic with a volume-weighted mean pH value of 4.26, which ranged from 3.04 to 6.41. 70.2% of the total samples had pH values less than 5.60. The percent contribution to anions for SO^2-4 and NO^-3 were 59.0% and 19.9% respectively. Ca^2＋ was the highest concentration among the total cations with a contribution of 46.4 % , while NH^＋4 presented 17.5%. Nearly 84.7% of the acidity of rainwater was neutralized by main alkaline cations, Ca^2＋ and NH^＋4. Enrichment factors of major ions were computed to assess possible sources of major ions. The results showed that SO^2-4 and NO^-3 were from anthropogenic activities, while Ca^2＋ and K^＋ from crust sources.
出处
《环境监测管理与技术》
2009年第6期20-23,共4页
The Administration and Technique of Environmental Monitoring
基金
广东省科学院分析测试基金资助项目(sf200804)
关键词
降水
化学特征
源估计
富集系数
中和因子
广州白云山
Wet precipitation
Chemical characteristic
Source assessment
Enrichment factor
Neutralization factor
Mountain Baiyun, Guangzhou
