土壤是自然环境的重要组成部分，是人类赖以生存的物质基础。长时间以来，城

土壤是自然环境的重要组成部分，是人类赖以生存的物质基础。长时间以来，城市土壤因大规模的工业产业、人类聚居和密集的商业等人为活动，受到了不同程度的污染，给城市生态环境和人体健康带来了很大的风险。
重金属污染是当今土壤污染中污染面积最广、危害最大的环境问题之一。导致土壤污染的重金属主要包括As、Cd、Co、Cr、Cu、Hg、Mn、Ni、Pb、Zn等，一般为几种重金属复合污染。重金属污染是当今土壤污染中污染面积最广、危害最大的环境问题之一。
其中，Cd污染周期长，移动性大，毒性高，难降解。本次实验模拟了PH=3.8的酸雨淋洗Cd污染土壤，测量淋出液的PH和体积，用AA240Z原子吸收光度计测量淋出液的平均吸光度和浓度，根据实验结果的分析，发现PH=3.8的酸雨淋洗含Cd一定的土壤后浸出液的PH是随着淋洗的进行先上升后下降再略有上升并趋于平稳。并且，PH=3.8的酸雨淋洗土壤后，淋出液的PH与土壤中含Cd的含量的关系是：随着Cd含量的增加，PH先上升后下降。

結果 (英文) 1:

Soil is an important part of the natural environment, is the material basis for human survival. Long time since urban soils due to large-scale industry, human settlements and dense commercial and other human activities, subject to varying degrees of pollution, urban ecological environment and human health is a big risk.Pollution is the contamination of soil pollution by heavy metals most extensive area, one of the biggest environmental problems. Leads to soil pollution by heavy metals mainly including As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, and Zn etc, usually several heavy metals contamination. Pollution is the contamination of soil pollution by heavy metals most extensive area, one of the biggest environmental problems.Among them, the long cycle of Cd pollution, mobility, and high toxicity, biodegradable. This times experiment simulation has PH=3.8 of acid rain leaching Cd pollution soil, measurement pour out liquid of PH and volume, with AA240Z atomic absorption photometer measurement pour out liquid of average sucking photometric and concentration, according to experiment results of analysis, found PH=3.8 of acid rain leaching containing Cd must of soil Hou dip out liquid of PH is with leaching of for first rose Hou declined again slightly has rose and tends to smooth. Also, PH=3.8 of acid rain leaching after soil, leachate PH and is the relationship between the content of Cd in soil: with increasing Cd content, and PH increased and then decreased.

結果 (英文) 3:

The soil is an important part of the natural environment, is the material basis for human survival. For a long time, urban soil due to large-scale industry, human settlements and intensive commercial et al for contaminated to varying degrees, to the urban ecological environment and human health brought great risk.
the heavy metal pollution is the pollution area and the most, one of the biggest environmental problems harm. Lead to soil pollution of heavy metals mainly including as, CD, Co, Cr, Cu, Hg, Mn, Ni, Pb, Zn, as several compound pollution of heavy metals. Heavy metal pollution is the most widely polluted area the soil pollution,One of the biggest environmental problems harm. The Cd
, pollution of long cycle, high mobility, high toxicity, refractory. This experiment simulates the PH=3.8 acid rain leaching of Cd contaminated soil, measuring pour the solution pH and volume, with atomic AA240Z absorption meter to measure the leachates average absorbance and concentration. According to the analysis of the experimental results and found with acid rain leaching of PH=3.8 CD of soil after leaching solution of pH with leaching of first increased and then decreased and then increased slightly and tends to be steady. And PH=3.8 acid rain leaching of soil, leaching solution pH and soil with the relationship between the content of CD is: with the increase in CD content.PH went up first then descended.