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The method of extraction of heavy metals such as mercury from fish raw

IPC classes for russian patent The method of extraction of heavy metals such as mercury from fish raw (RU 2167541):
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Method of raw milk purification from toxic metals / 2441397

FIELD: food industry.

SUBSTANCE: this invention covers method of raw milk purification from toxic metals and includes adding of a sorbent agent, purification from sorbent agent, herewith raw milk intoxicated with metals in (1.1…4.0)±0.1 MAC concentration undergoes purification. Purification is performed until 0.5 MAC ratio is reached; contact with a sorbent agent is performed at 6°C, 5 minutes with mixing. Purification from a sorbent agent is performed by a centrifugal method at the separator-milk purifier for cold purification, herewith grapheme powder of 0.1:1000 ratio is used as a sorbent agent.

EFFECT: decrease of toxic metals concentration in raw milk to (95…97)±1% degree of purification.

1 dwg, 2 tbl, 2 ex

(57) Abstract:

The invention relates to the processing of aquatic organisms and can be used to remove from fish raw mercury. As means for removing heavy metals from fish raw use ascorbic acid solution with concentration of 0.1% when the ratio of the solution and the fish of 1.5:1. When using as extractant ascorbic acid, which is a strong reducing agent, for a relatively short time derived from the product of a large part of the contained mercury. The invention will increase the number extracted from the raw material of mercury, with the minimum duration of the process.

The present invention relates to the field of processing of water bodies, in particular to the problem of removal of fish raw materials heavy metals such as mercury.

The known method of removing mercury from fish sources, such as meat, coal fish, by placing the raw material for a long time (about 72 hours) in a solution of testingground with the concentration of the solution to 1 % (Teeny F. M., Hall, A. S., Gauglitz E. J. Reduction of mercury in sablefish, anoplopoma fimbria, and the use of the treated fish in smoked products. Marine fish. Rev. 1974, 36, N 5, 15-19, i 11, tabe Bibliogr. 5 ref.)
The disadvantages of this method can unnuh nutrients. Moreover, this method is not effective - it is possible to reduce the mercury content in the raw material is only 8%.

The known method of removing mercury from objects fisheries through the use of hydrochloric acid cysteine, in a solution which contains raw materials (Spinelly J., Steinberg, M. A., Miller R., Hall, A. L. Zerman Reduction of mercury with cystcine in comminuted halibut and hake protein concentrate "J. Agr. And food Chem." 1973, 21, N 2, 264-268).

Depending on the concentration of hydrochloric acid and the exposure time of the substrate in solution, this method allows to reduce the mercury content in the solution is from 40 to 20%.

The disadvantages of this method should also include the duration of the extraction of mercury from raw materials and low quality product as a result of using these extractants.

The closest to the essence and the achieved result is a method of processing fish raw ascorbic acid solution (Express information TSNIITMASH series: Processing of fish and seafood, vol. 4, M: Misrephoth USSR, 1984).

This extractant, as ascorbic acid, safe for human health and at the same time is a strong reducing agent.

The disadvantages of this method include the lack of proven Tehnologichesky and so on), necessary for implementing the method.

The purpose of the creation of the proposed method of removal of heavy metals such as mercury from fish raw is to improve the quality of the product by reducing the time of extraction and determination of optimal values of the concentration of the acid solution and the volume ratio of fish raw materials and acids.

This goal is achieved by the fact that raw fish for about 10 minutes immersed in the prepared ascorbic acid solution with concentration of 0.1%. The ratio of the solution and the fish shall be 1.5:1.0 in.

These options are most appropriate, as in the course of the experiments, it was found that the decrease in the solution concentration up to 0.05% led to a decrease in the number of recoverable mercury by 15%.

Increasing the solution concentration to 0.3% also resulted in a decrease in the number of recoverable mercury by 35-37% for the maturation of raw materials in the solution for 10 minutes. Increasing the exposure time to 20 minutes also did not increase the percentage of recoverable mercury, and Vice versa, reduced by 20-25%.

The authors of the method was selected as the most optimal ratio of ascorbic acid solution and fish raw, ulala 1:1. In this case, mercury was extracted less. The use of ratios of 1.5:1 allowed us to increase the amount of recoverable mercury by 20%.

The advantages of this method include that as an extractant use of ascorbic acid, which has no harmful effect on the human body. At the same time, as a strong reducing agent, ascorbic acid can quickly remove from the product of significant amounts of mercury, without compromising the quality of the product.

An example of the method.

Prepare a solution of ascorbic acid in fresh water with a concentration of 0.1%, immersed in 1 kg of fish raw materials, such as chopped into pieces of meat big-eyed tuna, swordfish, sharks Mako and so on, the mercury content in which was 0.920 mg/kg, the ratio of solution and raw materials shall be 1.5:1, and the time is 10 minutes.

After extraction, the extract pieces and determine the amount of mercury. While the mercury content determined by the method of flameless atomic adsorption on mercury analyzer MASS-50 firms "Coleman". Studies have shown that the number of extracted mercury was 55.5%.

The method of extraction of heavy metal is that prepared ascorbic acid solution with a concentration of 0.1% and on time, approximately 10 min, immersed in his fish raw materials, and the ratio of the solution and the fish is 1.5 : 1.

 

 

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