There is a simple and intuitive way based on qualitative responses mercury with copper iodide.The resulting substance is thus the formula Cu2 (HgI4) has a pink-red color.The higher the concentration of mercury , so, consequently, more intense in his painting.
To fabricate LED need porous filter paper, any soluble copper salt, e.g., chloride, sulfate salt solution of potassium iodide or sodium iodide and the sodium sulphite or sodium hyposulphite.
paper cut into strips (size neprintsipialen, but for the convenience of better middle-sized), dipped in a solution of
copper salts, after which it was recovered, slightly dried, and dipped into a solution of iodine salts.The resulting copper iodide will be mainly in the pores of the filter paper, and iodine - on the surface, because of his paper "pobureet."Then the strip is placed in a sulfite solution (hyposulfite) solution.Iodine is removed (this is evident by discoloration of the paper).The strips should be rinsed with clean water and dry.They are ready.It is desirable to store them in a dark place in a closed container.
If you suspect that the air present pair mercury , we must put one strip in each audited area.A few hours later, we check to see whether they change color.If he became a pinkish-red - this alarm.So, there is mercury in the air!It is necessary to take measures to detect and remove the source of the poison.
Tip 2: How to find mercury
Mercury - a unique element, because it is metal present under normal operating conditions in liquid form!Most of these metals is not in the whole periodic table.Mercury vapors are extremely toxic and lead to severe poisoning, therefore, very important time to detect their presence in the air!For special perfidy of this element is that the time of its negative effect does not manifest.
- - filter paper;
- - copper salt;
- - a solution of potassium iodide.
Take filter paper (preferably with large pores), any soluble copper salt, such as copper sulfate, a solution of potassium iodide and a solution of sodium hyposulfite (aka - sodium thiosulfate, previously widely usedas a component of "fixer" in the photographic business).
Cut rectangular strips of paper of a small size, such as 2x5 cm. Dip the strip into a solution of copper sulfate.Then, a little Dry the, dip them in a solution of potassium iodide.The paper quickly turns brown.
After this strip rinse in a solution of sodium hyposulfite.Paper discolored.After rinsing with clean water and dry the strips are ready for use.They should be stored in a dark, tightly sealed container.
What is the purpose of the procedures performed?First strips impregnated with a copper salt deposited on the entire surface of paper (including in its pores).Then, the interaction of copper sulfate with potassium iodide to form a new salt - copper iodide and iodine stood out clean.Sol "concentrated" in the pores and iodine - on the "smooth" areas of the paper, because of which it is taken and brown.After washing with sodium thiosulfate, iodine was removed, and copper iodide remained in the pores of the strips.And from that moment he became the paper "display", suitable for the detection of mercury.
When you need to check, do not contain any mercury vapors in the air, cooked, remove test strips from the container and place in the room.Several hours later, see if the paper has not taken a pinkish-red hue.If adopted, then copper iodide to react with mercury to form a complex compound Cu2 (HgI4), that is, the air is polluted by mercury vapor!To take urgent action to remove the source of contamination and decontamination room.
Mercury vapors are extremely toxic, causing serious illness of a number of organs of the human body.Many residents and guests of St. Petersburg, St. Isaac's Cathedral admiring, not even suspect that a few dozen people involved gilding its dome, died or became disabled, because when this work was used amalgam method (with mercury).Even a single mercury thermometer broken in the apartment, can cause trouble.Especially that mercury vapors are odorless and for the time being does not currently look like.
- determination of mercury