| Longkou base for pollution-free wheat to this study,the evaluation of the air quality,soil quality and water quality assessment studies to evaluate the quality requirements for pollution-free agricultural lands.From the air,water, soil and environment,the more systematic evaluation of the environmental quality of its production base for pollution-free status.The following are the main points:1.Longkou City beginning in 2003,three consecutive years of air monitoring data,in addition to 2005 West Liu(the outside factors,the wind,it is therefore TSP higher,which will affect the evaluation results),and monitoring the pollution indices were less than 1,the pollution index values are less than the air quality standards that the Base atmosphere of good quality, free from contamination;Three integrated monitoring atmospheric pollution index is less than 0.6,is Clean2.Longkou City in 2003—2005 in selected locations represents 14 zones in the soil.The results are as follows:three sampling of mercury,cadmium, arsenic,lead,chromium,copper mg·kg-1,0.05mg·kg-1 average of 0.01,6.53 kg, 5.24mg·kg-1,41.50mg·kg-1,14.30 kg.My background value compared with the soil,the soil sampling three background values are lower than the national average level of the background.Under the soil organic vegetable production and environmental quality standards(GB15618),PH＜6.5 conditions,mercury, cadmium,arsenic,chromium upper limit of 0.3 kg,0.3 kg,40 kg,100 kg,150 kg,Longkou City,the heavy metal content in the soil is less than the standard. Results from soil pollution index and single table and soil pollution index evaluation and results can be seen in Table soil pollution index Pi＜0.7 individual,is pristine;PI＜0.7 soil pollution index that is safe,clean levels.3.2003 Three Represents sexual selection in Longkou City—While the northern location,the former North Shangrna Morodome Wang Ge Zhuang Longgang and irrigation water testing and the results are as follows:2003 Longkou City water was basically neutral,three samples are not heavy metals mercury,arsenic was detected;The cadmium only examines in dragon port Wang Gezhuang,the content is 0.0028mg·L-1,is lower than our country farmland irrigation water quality standard GB5084-92 to stipulate dryly makes under the condition the cadmium biggest permission content is 0.1mg·L-1; Irrigation water quality standards GB5084-92 provided irrigation water of lead, chromium content of the biggest measured 0.1 points mg·L-1,3 water samples comply with the standards.However,water samples collected from Wang Ge Zhuang Longgang water fluoride content exceeded the limit of fluorine(＞3.0mg·L-1.In 2004 Mazhen all administrative villages has gathered the irrigation water sample north the core model district,examines its nitrate content with emphasis.The examination result indicated that,in 2003 all monitors hit the mark the ground water nitrate content to be evenIn the three consecutive years from 2003 to the beginning of the water sentinel surveillance results show that the individual indicators Pi pollution index value is less than 1,indicating that the bases of irrigation water not contaminated,pollution-free agricultural irrigation water to achieve the standard;The base of the monitoring of agricultural irrigation is still clean or cleaner that the irrigation water of good quality,but the higher levels of chromium chloride.
|
PDF Full Text Request