Demercurisation composition

FIELD: metallurgy.

SUBSTANCE: proposed composition comprises 3.0-5.0 wt % of dichlorisocyanuric acid soda as halogen-bearing compound, 0.5-1.5 wt % of thiourea as complexing agent and water making the rest.

EFFECT: higher efficiency of removal mercury from soil, reduced aggressiveness of used substances relative to rooms interior, instruments and equipment.

1 tbl


The invention relates to compositions intended for the purification of mercury (mercury removal) of various objects, in particular residential and administrative buildings, health institutions, schools, preschools, mercury pollution which is caused by the destruction of household mercury-containing products.

From the prior art known composition for demercurization, comprising an aqueous solution of potassium permanganate and hydrochloric acid. The reaction products of mercury and demerkurizatsiju reagent removes detergents (see Pugacheva P.P. "Working with mercury in laboratory conditions", M., Izd-vo "Chemistry", 1972). However, the composition is not sufficiently effective, because its application does not provide a decrease in the concentration of mercury vapor in air to the maximum permissible concentration (MPC) - 0.0003 mg/mł

Known composition for demercurization of premises-based solutions of copper sulfate and potassium iodide (patent RU №2081198, M CL SW 43/00, 1997). The peculiarity of this structure is that its active components are formed directly on the cleaned surfaces by sequential sputtering first solution of copper sulphate, and then potassium iodide solution, which interact with the mercury with the formation of complex compounds. The disadvantage of this structure is the toxicity of agressivnosti formed by the reaction of gaseous iodine and as a consequence, damage to the interior (education brown plaque), corrosion of metal products, negative effects on devices and equipment. Work on demercurization using this composition, due to the high aggressiveness components must perform a special service.

The closest to the technical essence of the present invention is a composition for cleaning of premises from mercury on the basis of an aqueous solution of alkali metal halide. As the halide of the alkali metal in the known method using sodium chloride, acidic solution (pH 1.5 to 2.5) which receive unipolar treatment (electrolysis) immediately before use (avts USSR 1157103, CL C22B 43/00, 1983).

The disadvantage of this structure is the considerable complexity of the cleaning process from mercury (the need to subject the composition of the electrolysis before performing the demercurization), which does not allow to recommend this part to address mercury contamination in the domestic environment.

The objective of the invention is the creation of demercurization of the composition, with which users of household mercury-containing products, in case of their failure, can own, without calling a special service, to eliminate mercury pollution with a guaranteed assurance of installed sanitary-and-hygienic norms.

Technical result achieved in the present invention represents an increase of efficiency of purification of mercury and the aggressiveness of the drugs used in relation to interiors, appliances, equipment.

The solution of the stated problem and the achievement of a specific result is achieved by the fact that the composition for demercurization of objects contaminated with mercury, including halogen-containing compound and water, according to the invention further comprises complexing agents, which is used as a thiourea, as well as halogenated compounds using sodium salt of dichloroisocyanuric acid, in the following ratio, wt.%:

Sodium salt of dichloroisocyanuric acid3,0-5,0
Thiourea0.5 to 1.5

The use of the composition improves the efficiency of mercury removal - reduces the content of mercury vapor in the air to the amount not exceeding the maximum permissible concentration (MPC=6,0003 mg/cubic meter), while reducing the aggressiveness of the drugs used in relation to Dept the major materials appliances and equipment.

Demercurization composition prepared by dissolving the components in water at the above ratio.

The components of the composition under the conditions of application of sustainable, non-toxic. Processing contaminated with mercury surface specified by the simple in technological performance, easy and does not require a long time to run.

Demercurization is carried out by treating the floor with an aqueous solution of chemicals, ensuring the translation of atomic mercury (mercury vapour and mercury adsorbed by the surface of the floor) mercury compounds. Demercurization ends by wiping surfaces with cloths dampened with household detergents. Wipes contaminated with salts of mercury, are removed by neutralization to a specialized company.

The mechanism of action of the composition is schematically represented as follows.

When interacting with water the sodium salt of dichloroisocyanuric acid (this salt contains latent form a strong oxidizer) is activated, forming hypochlorous acid, which then dissociates in water to form hypochlorite ion and hydrogen ion:

In fact, an active substance is hypochlorous acid. The maximum activity of lamovita acid gets in weakly acidic solutions. Therefore, it is important to maintain a stable pH level in the range of 5.8 to 6.2. This effect is high and stable demercurization activity of the claimed composition is achieved by the introduction in addition to the basic acting substance (sodium salt of dichloroisocyanuric acid) supplements in the form of thiourea. Hypochlorous acid under these conditions does not decompose with the formation of chlorine is in the bound state, thus is safer for people and the environment and does not require special safety measures.

Molecular structure of timeonline may be represented by the canonical thioamide form and toiminimi forms bearing the negative charge on the sulfur atom and the positive on the nitrogen atoms amidnogo fragment:

As a result, the sulfur atom is a strong nucleophilic center and thiourea is protonated at the sulfur atom with the formation of salt:

In the above reactions in solution are formed active oxidation components, namely HClO, ClO-that translate mercury atomic ion condition:


Data on the efficacy of the composition under different ratio of ingredients shown in the table.

Composition for removing mercury pollution caused by the destruction of household mercury-containing products
№ p/pConcentration, wt.%The content of mercury vapor in air, mg/m3(MPC=0.0003 mg/m3)
Sodium salt of dichloroisocyanuric acidThioureaWater

As the table shows, the use of the composition containing the optimal number of components that best provides for the cleanup of mercury to the established norms, i.e. when processing premises demercurization composition at a content of sodium salt of dichloroisocyanuric acid in the range of 3.0 to 5.0 wt.% and thiourea in the range of 0.5-1.5 wt.% reduced mercury vapor in the air to values not exceeding the maximum allowable value (MPC=0.0003 mg/cu.m). The decrease in the concentration of the components reduces the efficiency of mercury removal (items 1,2), increasing the concentration does not change the final result.

Composition for demercurization of objects contaminated with mercury, including halogen-containing compound and water, characterized in that it further comprises complexing agents, which is used as a thiourea, as well as halogenated compounds using sodium salt of dichloroisocyanuric acid, in the following ratio, wt.%:

Sodium salt of dichloroisocyanuric acid3,0-5,0
0.5 to 1.5


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