db5HSY1vkr

FG7FG4b57

Now is the late spring, full of a vibrant scene, in the ring on the roadside, a lot of people digging wild park. Some people say,http://cgi.geocities.jp/sagashizen/cgi-bin/bbs/light.cgi?res=114, eat vegetables can taste "flavor of nature." Yesterday, Ms. Wu, who lives in Wangjing readers of this column to a phone call, expressed his doubts, "the wild side of the road every day, being exposed to car exhaust, really fit to eat it?" Questions for Ms. Wu, a reporter with From the roadside to pick two wild shepherd's purse, sonchifolia, vegetables purchased from vendors in the hands and lettuce purchased from the supermarket,basket tn nike, came to Beijing Agricultural College Institute of Technology Laboratory for capital security of agricultural industry, led by the Professor Zhao Jianzhuang Under the guidance of a team of four vegetable samples brought heavy metal testing. The results showed that the heavy metals cadmium wild seriously overweight,chaussure nike tn, the highest of more than 1.8 times the national standard.
Questions
Roadside wild really safe?
On Saturday,spaccio woolrich, reporters saw in the vicinity also  street, some people are in search of roadside greenery like the wild dandelion and wild dug stuffed into plastic bags they carry. Most of these people are elderly, they told reporters, this time just to wild drilled out,outlet woolrich padova, just to dig some home taste fresh.
67-year-old Zhang said the master, wild is "any harm", rich in amino acids, high nutritional value. Speaking of the benefits of wild plants,moncler official, Zhang master eloquence. He said that in the market to buy vegetables play a pesticide, but there is no wild street fight drugs, so it is "green", eat very healthy. Although wild roadside vehicle exhaust or dust may be stained,giubbotto moncler prezzo, but home carefully cleaned, the bad leaves and roots on the soil all removed and boiled in cooking in boiling water, so that there would be nothing in the wild Hazardous substances of.
And in the North Fourth Ring a vegetable stall, reporters also found being sold wild. "This is our close up, very popular." Stall told reporters, because the wild especially popular, the number of goods each time whether they will be sold into. "Rest assured, we are all these wild pick from the ground, absolutely green."
Experiments
Detection of heavy metals in wild
That really so? Reporters took the shepherd's purse collected from the roadside, sonchifolia, sonchifolia and lettuce bought at the vegetable stall to buy in the supermarket, came to the capital of Beijing Agricultural Industrial Technology Research Institute laboratory safety of agricultural products, on the wild content of heavy metals tested. The detection of heavy metal,basket nike air max pas cher homme,http://rockclimbing.com.nmsrv.com/cgi-bin/photos/search.cgi, there are three.
1 processing vegetable samples
Yan Shi Yan laboratory assistant first wash vegetables, dry, and specimens from the edible parts, and then the vegetables into about 60 ℃ drying machine for drying, and then the samples were then crushed and sieved mill, storage in a desiccator. Subsequently, she weighed 1 g of each sample in the porcelain crucible, the first low heat plate to the adjustable, non-heating carbonization, and then transferred to a high temperature of 475 ℃ 525 ℃ ashed in a muffle furnace for 7 hours. cool down.
2 extract liquid sample testing
At this time, the sample has become gray, experimenters round sheets with concentrated nitric acid will be placed in the crucible is heated in an acid solution of a sample, the test sample was placed in the flask is made in the back.
3 preparation of copper, lead, cadmium solution
Experimenter Qi Ting were weighed copper, lead, cadmium three metals, and in accordance with the corresponding concentrations configured liquor.
4 Determination of heavy metal content in the sample solution
Experimenter Liangying Bo by graphite furnace atomic method (copper (GB / T5009. 13-2003), lead (GB / T5009. 12-2010),http://yaodianma.com/apps.php?q=diary&a=detail&did=195090&uid=9008, cadmium (GB / T5009. 15-2003)) were measured in the sample solution of copper, Lead and cadmium content.
The results
Wild Vegetables cadmium exceeding the national standard of 1.8 times
Sample No,http://www.goti-death.com/ayane/BBS/apeboard_plus.cgi/</,woolrich outlet firenze.
Copper (mg / kg)
Lead (mg / kg)
Cadmium (mg / kg)
Roadside sonchifolia
7,http://my.5754.cn/home.php?mod=spacecp&ac=blog&blogid=.99
0.14
0.06
Roadside shepherd's purse
4.80
0.18
0.09
Sonchifolia purchase
5.06
0.10
0.05
Lettuce
3.68
0.09
0.04
National Standards
10.00
0,site jordan pas cher.20
0.05
Thus,tn requin, all samples are heavy metals, copper and lead contents of which were not exceeded,moncler official site, but the roadside sonchifolia and shepherd's purse in the cadmium content exceeding the national standard, for which Professor Zhao Jianzhuang recommend eating roadside When the vegetables, the public should pay special attention. Buy sonchifolia cadmium content, although not excessive, but the content has reached the upper limit of the national standard, so when eating should also be noted.
Roadside wild vegetables purchased in relatively high content of heavy metals, and therefore can not blindly excavation, in the consumption but also to take it seriously. Generally, vegetables purchased in the heavy metal content in the standard range can be safe to eat.
Hazard
Three heavy metals have exceeded harm
After the lead enters the body,http://andromeda.rutgers.edu/~jlynch/cgi-bin/18th.cgi, except in part through feces,airmax pas chere, sweat excretion from the body, the rest invade brain tissue through the blood, so that inadequate supply of nutrients and oxygen, causing brain damage, serious enough to cause permanent disability. If the high lead content in the body kids, there will be loss of appetite, mobility and constipation, insomnia; If pupils, accompanied by hyperactivity, hearing impairment, lack of concentration, mental retardation and other phenomena; lead intake by pregnant women is placental barrier and affect fetal development, resulting in malformations.
Cadmium into the body, through biomagnification and accumulation, resulting in a series of damage to the human body. Cadmium harmful to human lungs, kidneys and liver to produce toxic effects, causing chest tightness, difficulty breathing, dizziness, fatigue, decreased renal function, symptoms of acute or chronic liver injury; cadmium can not only lead to high blood pressure, may also lead to atherosclerosis , but also with certain neurological diseases and disorders related to children's mental development; cadmium harmful to human T, B lymphocyte proliferation, survival capacity to generate direct inhibitory effect,http://www.t9pingtai.com/forum.php?mod=viewthread&tid=2191577, so that the body's immune function decreased; addition, cadmium can also interfere with copper , lead and zinc metabolism in the human body to produce toxic effects. In addition, although it is one of the copper trace elements needed by the body, but the body of copper content is too high can lead to hypertension, coronary heart disease, arteriosclerosis and other recent studies have shown that Alzheimer's disease also associated with high copper content in the human body concerned. High levels of copper can occur in hemolysis, hemoglobin decreased, elevated serum lactate dehydrogenase and brain lesions,http://www.matsue-yado.com/otoku/clip.cgi, can cause liver degeneration and other diseases.
Universal newspaper reporter Li Wang Qipeng J002 J219
TAKEFOTO with map
Asked
Heavy metal content in wild
Why is high?
This is because there are certain plants for heavy metal absorption, high leaded wild easily absorbed because of roadside vehicle emissions, the content of lead and heavy metals content and other harmful substances will be increased at this time, but once the accumulation is not easy to completely Clear.
Reasons for the high copper and cadmium content with increasing human activities, soil steady state copper and cadmium release occurred, moreover it is because the higher the degree of bioaccumulation of various wild cadmium.
(Original title: Roadside wild can not just eat)