Net friend explode material claim dark the intersection of Auricularia and surface gush out the intersection of lead and powder it increases the weight to be true or false?

Net friend explode material claim dark the intersection of Auricularia and surface gush out the intersection of lead and powder, it increases the weight to be true or false?
Recently, the newspaper material of a net friend, black Auricularia is after abundant soaking, the bowl will present black powder precipitate at bottom. This net friend thinks, the precipitate is some distributors, in order to increase the weight of the black Auricularia, the lead sprayed on the black Auricularia is pink. The dark Auricularia be when spraying just, the lead powder is adhered to the fold after the Auricularia has become dry, the naked eye can't be distinguished. For increase black weight of Auricularia, distributor really gush out the lead powder above?
Black Auricularia really has precipitate after soaking
In order to verify the inference of the net friend, reporters have gathered five black Auricularia samples on the market of farm produce, supermarket and market of food of Hangzhou separately, a form one " Cat's ears " ,Two big a black Auricularias, and two are much more small one deceive Auricularias
. Different places are bought, the price has nothing in common with each other too, divide according to price level, including 100 yuan kilogram, 84 yuan kilogram, 80 yuan kilogram, 76 yuan kilogram and 70 yuan kilogram.
A stall owner of food district of small commodity market of Qiantang River says, prices of the black Auricularia have something to do with the size, place of production. For example, on the small commodity market of Qiantang River, the black Auricularia price of the ordinary size is in 70 yuan about kilogram, the price of the small Auricularia is in 75 yuan - 80 yuan kilogram, the most expensive one is commonly called as " cat's ears " Dark for Auricularia,generally at 80 yuans kilograms of the above. After reaching the market of farm produce, retail price is 10 yuan each kilogram expensive - 20 yuan on this basis.
Soak after the an hour finding five black the intersection of Auricularia and sample, 5 pieces of bowl bottom have powder precipitate at various degrees.
According to the national standard, the weight should be 12- 13 fold, " cat's ears " after black Auricularia bubbles take place Obviously not up to standard, may have been added the white sugar and mixed the flour.
The precipitate is that the plumbous possibility is not big
Association's Deputy Secretary-general, red agricultural product general manager of Co., Ltd. China, province of Korea S. in Hangzhou China of edible fungus in Zhejiang Province think, the precipitate is that the pink possibility of lead is not big. In order to verify one's own inference, China, province of Korea S. has done a reverse experiment.
He fetches the black Auricularias of different varieties of 10 grams separately, packs into 5 different cups, add hot water of half and half the cold water, observe the bubbles of the black Auricularia to send the situation half an hour later.
Half an hour later, five black Auricularia samples swell in various degree. Among them, get rid of " cat's ears " Swell for about two fold outside, other four pieces of sample volume have been turned into for 4- 5 fold. And different black precipitate appears at five pieces of cup bottom.
Weigh five samples after inflation again separately, the weight is successively 123, 131 grams of, 107, 110 grams of and 39 grams.
Except " cat's ears " Beyond, other four samples basically accord with the taking place rate of relevant bubbles in black Auricularia national standard as 12%- 13% of the standards, " by the look of normal attribute of the Auricularia that steep after taking place the weight because absorbs water to rise to 12- 13 fold, can conclude that has not added other materials in these four sample processing courses. "
China, province of Korea S. says, it mainly has two kinds of situations that there is powder precipitate after soaking in black Auricularia, "saw-dust culture law is a kind of more general culture laws of black Auricularia of large canopy at present, phenomenon that so there is residue after soaking. May add other materials too certainly. "
Biological system engineering and institute's professor of the food science of Zhejiang University enter and say in conformity with the iron, the weight or color and luster increasing agricultural products with garniture is more general, but it is not very feasible to increase the weight with the lead, " plumbous and with very high costs, it may not be enough to offset the plumbous input cost yet that black Auricularia increases the so little weight, the lead has very strong chemical inertia at the same time, the human body is too much and very easy to poison to take in, from the this, distributors do not dare to do so very much either. "
The precipitate may be the flour or magnesium sulfic acid
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