珠江三角洲地区酸雨及酸化地下水分布特征

珠江三角洲地区是我国酸雨比较严重的地区之一,二氧化硫排放量大,酸雨频率高,pH值低,其对地下水的酸化起着主要的影响作用。经对该地区878个地下水点的pH值现场测试表明,pH值小于6的地下水约占33.4%,酸性地下水（pH值〈6.5）主要分布于西、北、东环绕的低山、丘陵地区,分布面积要占到全区面积的四分之三,地下水酸化已成为区域地下水最大的环境地质问题。

Distributions of Acid Rain and Acidified Groundwater in Pearl River Deltas

Pearl river delta area is one of the most serious acid rain region in our country,where the acid rain with low pH value occurs flequently,it plays significant role in acidifying the groundwater.In this paper,we selected and analyzed pH values from 878 ground water points in this area.The results show that the rate of pH6 is about 33.4%,acidified ground water with pH6.5 covers 3 quarters of the area,mainly distributed in low hills and uplands.By far,the acidified groundwater,maily caused by acid rain,has become the major environmental problem for groundwater.