【摘要】 2005年4~9月在广东省云浮市采集到28场降水样品进行降水化学分析.结果表明,SO42-和Ca2+是物质的量浓度最高的阴、阳离子,平均量浓度分别为291.71μeq/L和284.65μeq/L,占离子物质量浓度总量的75%;SO42-/NO3-的量浓度比平均为8.64,降水污染主要为硫酸型;降水中碱性离子对酸性离子的中和作用显著.离子浓度高值出现在5月和8月的汛期过渡期,低值则发生在6~7月的主汛期;除NH4+离子外,其他离子的月平均浓度的变化趋势比较类似,说明这些离子有相近的来源以及类似的传输途径.更多还原

【Abstract】 A short term study of the chemical composition of rainwater was carried out from April to September 2005 at Yunfu City in Guangdong Province.The major ions are SO2-4 for anions and Ca2+ for cations,with mean volume weight concentrations of 291.71μeq/L and 284.65μeq/L,respectively,both of which accounts for 75% to the total ion concentration.The SO2-4/NO-3 ratio is 8.64,indicating the sulfate is the major pollution matter.The cation Ca2+ appears to play significant role in neutralizing the acidity rainwater.Moreover,the higher ion concentrations are found in the transitional period between the flood seasons,and the lower ones in flood seasons.Except for the NH+4,similar temporal variation is shown among other ions,suggesting they have the common source and similar transport channel.更多还原