标题: yA69H841lN [打印本页] 作者: hz0弄eyt3 时间: 2014-12-4 16:12 标题: yA69H841lN 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, eat vegetables can enjoy "the taste of nature." Yesterday, Ms. Wu, who lives in Wangjing readers of this column to a phone call, expressed his doubts, "wild street every day exposed to car exhaust into really fit to eat it?" Question for Ms. Wu,http://d.smartinfohk.com/house3/home.php?mod=space&uid=80194&do=blog&quickforward=1&id=5043413, a reporter with From the side of the road to pick two wild shepherd's purse, sonchifolia, vegetables purchased from vendors as well as the hands of lettuce purchased from the supermarket, went to Beijing University of Agriculture and Technology Research Institute laboratory safety capital agricultural industry, led by the Professor Zhao Jianzhuang Under the guidance of a team of four vegetable samples brought heavy metal detection. The results showed that the cadmium wild seriously overweight, the highest was 1.8 times more than the national standard.
Doubt
Roadside wild really safe?
On Saturday, reporters saw in the vicinity also Street, some people are in search of roadside green wild herbs like dandelion and wild dug stuffed into plastic bags they carry. Most of these people are elderly, they told reporters, this time to the wild just drilled out, just to dig some home taste fresh.
67-year-old Zhang said the master, wild is "any harm",woolrich italy, rich in amino acids and high nutritional value. Speaking of the benefits of wild plants, Zhang master eloquence. He said that in the market to buy vegetables play a pesticide, and no wild street fight drugs, so it is "green", eat very healthy. Although wild roadside vehicle exhaust or dust may be stained, but the home carefully cleaned,http://www.edit.ne.jp/~aino/custombbs.cgi/</隸?蝪?蜀吩??逧??大捩??悟?壻??蜿?莉?逕?騾怜捷謌冶/, 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 of a vegetable stall, reporters also found being sold wild. "This is a close up of our very popular." Stall told reporters, because wild especially sought after, each no matter how much they carry goods will be sold. "Rest assured,anelli tiffany outlet, we are all these wild plants from the ground pick, absolutely green."
Experiment
Detection of heavy metals in wild
Is this really so? Reporters from the roadside holding a collection of shepherd's purse, Lactuca,prezzo woolrich parka, sonchifolia and lettuce on a vegetable stall bought buy in the supermarket, went to Beijing Capital Safety Industrial Technology Research Institute of Agriculture Agricultural Laboratory of wild The content of heavy metals testing. The detection of heavy metals in a total of three.
1. processing vegetable samples
Shi Yan Yan first laboratory assistant Wash vegetables, dried, and specimens from the edible parts,outlet cadriano woolrich, and then about 60 ℃ and vegetables into the dryer for drying, and then the samples were then crushed and sieved mill, storage in a desiccator. Subsequently, she were weighed 1 g of a sample in a porcelain crucible,comprare hogan online, low heat before carbonization in adjustable electric plate to smoking, and then moved into a high temperature of 475 ℃ to 525 ℃ muffle furnace ashing 7 hours, cool down.
2. Extract the sample test solution
At this time, the sample has become gray, laboratory assistant Caroline Zhang with concentrated nitric acid will be placed in the crucible of the sample was heated acid solution,tuta moncler uomo, prepared test sample solution in the flask for use.
3. The preparation of copper, lead, cadmium solution
Experimenter Qi Ting Weigh copper, lead, cadmium three metals, and in accordance with the corresponding concentration of the mother liquor configured.
4. Determination of heavy metal content in the sample solution
Experimenter Liangying Bo graphite furnace atomic method (copper (GB / T5009. 13-2003), lead (GB / T5009. 12-2010), cadmium (GB / T5009. 15-2003)) were measured in the sample solution of copper, Lead and cadmium.
The results
Wild Vegetables cadmium exceeding the national standard of 1,basquette requin.8 times
Sample No.
Copper (mg / kg)
Lead (mg / kg)
Cadmium (mg / kg)
Roadside sonchifolia
7,outlet hogan torino.99
0.14
0,http://www.4x4smap.com/cgi-local/ikesbbs/glight/glight.cgi.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,http://www.s130.net/cgi-bin/gsx/bbs.cgi.00
0.20
0.05
Thus,http://www.scopesys.com/cgi-bin/today2.cgi, all samples are heavy metal residues, wherein the content of copper and lead were not exceeded, but the roadside sonchifolia and shepherd's purse cadmium content exceeding the national standard, for which Professor Zhao Jianzhuang recommend eating roadside When the wild,woolrich outlet bari, 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 relatively high content of heavy metals,http://www.dojjj.com/home.php?mod=spacecp&ac=blog&blogid=, and therefore can not be blind excavation, in the consumption but also to take it seriously. Generally, vegetables purchased in heavy metal content in the standard range, can be safe to eat.
Harm
There are three kinds of harmful heavy metals exceeded
Lead enters the human body, in addition to some by feces, sweat excretion to the outside, the rest of the brain tissue invasion by blood, so that inadequate supply of nutrients and oxygen, causing brain damage, serious enough to cause permanent disability. If high lead levels in the body child, there will be loss of appetite,woolrich outlet padova, mobility and constipation, insomnia; if students, accompanied by hyperactivity, hearing impairment, lack of concentration, mental retardation and other phenomena; it will lead intake by pregnant women placental barrier and affect fetal development, resulting in malformations.
Cadmium into the body, through the biomagnification and accumulation, causing a series of damage to the human body. Cadmium harmful to human lungs, kidneys and liver to produce toxic effects, causing chest tightness,tiffany outlet, shortness of breath, dizziness, fatigue, decreased renal function, symptoms of acute or chronic liver injury; cadmium can not only lead to high blood pressure, but also may lead to atherosclerosis also with certain neurological diseases and disorders related to children's mental development; cadmium harmful to human T,http://www.sharesjp.biz,ciondolo tiffany cuore, B lymphocyte proliferation, viability,http://www.edit.ne.jp/~aino/custombbs.cgi/</zdMJxiAdSW/, a direct inhibitory effect, so that the body's immune function reduced; In addition, cadmium can also interfere with copper Lead and zinc metabolism in the human body to produce toxic effects. In addition, although copper is one of 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 levels of copper in the human body related. High levels of copper can occur in hemolysis, hemoglobin decreased, elevated serum lactate dehydrogenase and brain lesions, can cause Wilson's disease and other diseases.
Universal reporter Li Wang Qipeng J002 J219
TAKEFOTO with map
Questioning
Heavy metal content in wild
Why is high?
This is because the plants to absorb heavy metals have a certain role, leaded high is easily absorbed because wild roadside vehicle emissions, the content of heavy metals such as lead and other harmful substances content of this time will be increased, and once the accumulation is not easy to complete Clear.
Copper cadmium content causes and with increasing human activities, soil steady state copper and cadmium release occurred, moreover it is because the higher the degree of various wild bioaccumulation of cadmium.
(Original title: Roadside wild can not just eat)