Copper sulfate is a heavy metal. Generally, it can be divided into three types: industrial (industrial), agricultural (plant) and feed (poultry and livestock). Professor Ling Yongjian of the Department of Chemistry at Tsinghua University pointed out that if copper sulfate for industrial use is added to the feed, the copper content may be high, and it is even more worrying that it may also contain other heavy metal impurities. It will cause serious harm to both poultry and animals.
Industrial grade copper sulfate used in inks, dyes, batteries
The Agricultural Committee stated that feed-grade copper sulfate is used as a nutritional supplement, extracted from natural copper ore or produced from pure copper electrolysis, and is mainly added to animal feed such as pigs and chickens. Agricultural-grade copper sulfate is made of feed-grade copper sulfate with lime. It is mainly used as a fungicide. As for industrial grade copper sulfate, the waste liquid from the etching of printed circuit boards in electronics factories is reprocessed through resource recovery and can only be used for printing inks, dyes, batteries and other purposes.
A small amount of copper can help poultry grow and less sick
Ling Yongjian said that a small amount of copper was originally allowed in the feed, because livestock and humans need a small amount of copper. One helps metabolism, such as hematopoietic and skeletal development. It also helps gastrointestinal bactericidal effects, similar to the pharmacological effects of antibiotics. As a matter of fact, it is generally regarded as a growth hormone, hoping that it can quickly help poultry and animals grow and get less sick.
Feed grade copper sulfate is more than 10 yuan per kilogram of high industrial grade
The three types of copper sulfate are mainly due to the purity of the copper component and the amount of impurities, and the price varies depending on the purity. Feed grade copper sulfate is mainly produced from natural copper ore or from pure copper electrolysis. Industrial grade copper sulfate is mostly recovered from industrial waste liquid. It is reported that one kilogram of industrial copper sulfate is about 60 or 70 yuan, and copper sulfate for feed is priced at 8 yuan. Fifteen to ninety yuan.
Ling Yongjian pointed out that the copper used for livestock feed must be the purest, and the content in the feed must be less than 50ppm (150ppm for agriculture in some countries). Copper sulfate for industrial use may be high in addition to copper, and is often mixed with many other Heavy metals are not allowed in livestock feed or for agricultural use.
If copper is ingested into the human body, Ling Yongjian pointed out that according to US research data, children between the ages of nine and thirteen years of age consume copper at about ○. Seven milligrams, about ○ for adults. Nine milligrams. If overdose, nausea, nausea, and diarrhea are mild. Copper poisoning and hematuria may occur if severe.
If copper sulfate produced from industrial waste liquid contains lead and other heavy metals, it may even cause anemia, digestive system, nervous system, kidney or reproductive system poisoning.