Method of evaluating protective properties of materials of facial parts of gas mask with respect to β,β'-dichlordiethylsulfide by application of its simulator butyl-β-chlorethylsulfide

FIELD: medicine, rescue facilities.

SUBSTANCE: method relates to evaluation of protective properties of materials of facial parts of gas masks with respect to β,β'-dichlorethylsulfide by application of its simulator - butyl-β-chlorethylsulfide. Method includes application on one side of material of gas mask facial part of simulator - butyl-β-chlorethylsulfide drops with further analytic determination of the moment of accumulation in sample of limiting amount of simulator. Butyl-β-chlorethylsulfide in tested sample is caught by sorption substrate Quantitative determination of simulator is carried out with application of photocolorimetric method of analysis Limit of sensitivity of detecting butyl-β-chlorethylsulfide constitutes 1·10-3 mg/ml with inaccuracy not exceeding 15%.

EFFECT: technical result lies in possibility to carry out evaluation of protective properties of not only rubberised fabric, but also materials of facial parts of gas masks (rubbers) of various thickness, with increase of evaluation method safety

2 dwg

 

The invention relates to the field of research or analysis of the protective properties of the materials of the facial parts gas masks when exposed to drops of β,β'-dichlorodimethylsilane (DDS) through the use of simulator - butyl-β-chloridesulfate (BHAS) as a substance simulating the penetrating ability of mustard.

The chemical structure of butyl β-chloridesulfate shown in the formula

CI-CH2CH2-S-CH2CH2CH3CH3.

Analysis of the provisions of the "Convention on the prohibition of the development, production, stockpiling and use of chemical weapons and on their destruction" and the current state of the methodical providing of tests for the evaluation of the protective properties of the materials of the facial parts of the masks with the use of toxic chemicals (TX) shows that it requires immediate improvement in the selection of models and development of laboratory techniques for the study of their use.

This is due to the fact that in recent years has significantly reduced the amount of toxic chemicals intended for research on evaluation of quality indicators of personal protective equipment (PPE), but the volume of conducted tests on samples of PPE in the course of their development, production, operation and storage remain at p is einem level.

Is known about the use of butyl-β-chloridesulfate as a simulator to simulate and study the physical, physicochemical and chemical properties of the compound (patent RU 2162077 C2).

However, the possibility of using butyl-β-chloridesulfate for the purpose of evaluation of quality indicators (defensive power) PPE was not determined.

It is known that as a simulator of the compound to determine the protective capacity of an insulating rubber material used γ-(chloropropyl)propelled using the spectral method of qualitative analysis (patent RU 2249810 C2).

The disadvantage of this method is that the used spectral method is intended for the qualitative (excluding quantitative) determine the protective capacity of only an insulating rubber material, and β-(chloropropyl)propelled is not the closest structural analogue of mustard.

Closest to the proposed invention is a method of evaluation of the protective properties of rubber materials used for the manufacture of PPE from toxic chemicals, namely the permeability estimation of β,β'-dichloromethylsilane through the protective materials the spectral method of qualitative analysis by time of protective action of the material when using butyl-β-chloridesulfate modeling penetrate the th ability of β,β'-dichloromethylsilane through materials PPE (excluding inhalation component) (patent RU 2231063 C2).

However, the disadvantages of this method is that the spectral method is intended for the qualitative (excluding quantitative) determine the protective capacity of only an insulating rubber material without regard to differences in the thickness of materials, taking into account only skin-resorptive effect.

The present invention is to develop a method to estimate time of protective action (including inhalation component) materials facial masks parts (rubber) of different thickness using the photocolorimetric method of quantitative determination of penetrating the layer of material substance.

Technical result achieved in the claimed invention is:

the possibilities for research on the assessment of the protective effect not only rubberized fabric, but materials facial masks parts (rubber) of different thickness with the qualitative and quantitative determination of penetrating substances with regard to inhalation component;

enhancing the safety of research on the evaluation of the protective properties of the materials of the facial parts of the masks;

the possibilities for these studies in terms of the "Convention on the prohibition of the development, production, stockpiling and use of chemical weapons and on their destruction".

Given the technical result is achieved by way of evaluation of the protective properties of the materials of the facial parts masks for β,β'-dichloromethylsilane, which consists in applying to one side of the material of the front of the mask drops simulator - butyl-β-chloridesulfate, which is captured after the test sample sorption substrate with subsequent analytical determination of the point of accumulation for the sample limit of the simulator using the photocolorimetric method of analysis and the limit of detection sensitivity butyl-(3-chloridesulfate 1·10-3mg/ml with an error not exceeding 15%.

Thus in this way:

1. Assess the possibility of determining butyl-β-chloridesulfate photocolorimetric method of quantitative chemical analysis that is used when determining the protective properties of the materials of the facial parts masks for β,β'-dichloromethylsilane.

2. Conducted research to assess the protective properties of the materials of the facial parts of the masks using β,β'-dichloromethylsilane and butyl-β-chloridesulfate.

3. Determined the correlation between the time of the protective action of the materials of the facial parts of the masks corresponding to the criterion of exhaustion of its protective properties, β,β'-dichloromethylsilane and butyl-β-chloridesulfate.

Evaluation of the protective properties of the materials of the facial parts of the masks using butyl-β-chloridesulfate possible Prov is going photocolorimetric method of quantitative chemical analysis, based on the interaction of the compound with a salt of thymolphthalein in ethanol solution.

(reagent T-135), which is formed ester with yellow color.

In the reaction with the reagent T-135 mustard acts as an alkylating reagent. The course of this reaction presented in equation 1.

Similarly, this indicator responds butyl-β-heoretically. The direction of the reaction are presented in equations 2, 3.

As a result of reactions butyl-β-heoretically and indicator T-135 is also formed ester having a yellow color, the intensity of which will depend on its concentration in the sample solution.

To confirm the above comparative evaluation of appearance indicative of the effect in the interaction of β,β'-dichloromethylsilane and butyl-β-chloridesulfate with the reagent T-135.

The test results established that the indication effect is present in both cases, which indicates the possibility of using butyl-β-chloridesulfate instead of β,β'-dichloromethylsilane in the method of evaluation of the protective properties of the materials of the facial parts of the masks.

In the next step assessed the protective properties of the materials front, the hour is she masks for β,β'-dichloromethylsilane and butyl-β-chloridesulfate.

The essence of the method consists of applying to one side of the sample material of the front of the mask drops butyl-β-chloridesulfate and subsequent analytical determination of the moment of the accumulation pattern of the limited number of simulator calculated by the equation:

where q is a valid number BHAS penetrated for the test sample of the material of the front of the mask, placed in the device No. 5M, while protective actions, mg (criterion value);

PCt50- acceptable (threshold) inhalation dose pair BHAS in your mask space mask (0,31 mg·min·l-1);

and the ratio of the squares of the "work" section of the sample placed in the device No. 5M (S1=10 cm2) and the maximum surface of the front part of the mask with an accuracy of 0.5 cm2that while wearing the mask in position "Gases" remains open and can become contaminated with droplets of toxic chemicals (S2);

V is the volume of pulmonary ventilation of a person at rest (V=8,0 l·min-1).

The test objects were the following materials used for making facial masks parts:

sample # 1 - rubber, manufactured from natural rubber (NC);

sample # 2 - rubber, which is made of a synthetic isoprene rubber (SKI.

Samples of the test materials cut out the template and fix the piston devices No. 5M representing diffusion cell (see figure 1).

Piston devices No. 5M made of stainless steel and consist of a piston (1); the housing (2); a clamping nut (4)bushing (6), in which propylene three slit-like openings (7) 0.8×15.0 mm; cap (8)having an outlet nozzle with a diameter of 5 mm and a height of 20 mm (9).

For exceptions, contact the sorption of the substrate (11) with a sample of the test material (5) apply metal lath (3) with a mesh size of 2.0×2.0 mm 10...15 mm less than the diameter of the sample.

Laboratory setup for testing (see figure 2) includes filtering and absorbing box (1) for exhaust air cleaning); rotameter (2) to control the speed of the blower air samples; thermostat (3) to maintain a constant temperature; six devices No. 5M (4) vested in them, samples of the test materials.

The installation is connected to the vacuum line, set the temperature in thermostat plus 40°C and air cooling of the samples to air outdoor (infected) side with a speed of 2.5-3.0 m·s-1.

Further, the devices No. 5M sample test materials are removed from thermostat, remove the cover from the instrument and from the metering device to the outer surface of the samples put drops of β,β'-dal is diethylsulfide (butyl-β-chloridesulfate) based matching their number a specified density of contamination by sulfur mustard.

Pair β,β' - dichloromethylsilane (butyl-β-chloridesulfate)penetrated the sample are absorbed by the sorption substrate lying on the piston. Sorption substrate is periodically replaced with new every 15-30 minutes (depending on thickness of the test material).

The captured substrate is placed in a test tube with a glass stopper. In a test tube pour extracting fluid at a rate of 1 ml of the extractant on 1 cm2sorption of the substrate. Acting substance β,β'-dichloromethylene (butyl-β-heoretically) extracted 96,0%ethyl alcohol alcohol. The duration of extraction for 30 minutes without shaking or 5 minutes with shaking for 1-2 minutes.

The concentration of β,β'-dichloromethylsilane (butyl-β-chloridesulfate) in the extract is determined by pre-constructed calibration curve.

The experimental results presented in the table.

The protective properties of the materials of the facial parts gas masks when exposed to drops of mustard gas and simulator
The test materialTime of protective action 1 mm material thickness, min, when exposed to drops
β,β'-dichlormid is sulfide butyl-β-chloridesulfate
No. 1 (NC)90,060,3
No. 2 (RCM)75,041,3

Data analysis the table shows that the time for the protective effect of test materials dropwise β,β' - dichloromethylsilane on average 1.6 times more than in the tests on butyl-β-chloridesulfate in similar conditions.

The time evaluation of the protective action of the materials of the facial parts of the masks is performed using the conversion factor (parameter correlation), obtained on the basis of results of experimental studies on β,β'-dichloromethylsilane and butyl-β-chloridesulfate:

where: τDDS 1the time of protective action dropwise β,β'-dichloromethylsilane, min, per 1 mm thickness of the material;

τIMIT 1the time of protective action dropwise butyl-β-chloridesulfate, min, per 1 mm thickness of the material;

k - factor time of protective action materials for β,β'-dichloromethylsilane using data on butyl-β-chloridesulfate determined experimentally for each material type.

To calculate the time for the protective effect of mother studied the crystals to 1 mm thickness, you must use the equation:

where: τIMIT 1the time of the protective action of the material dropwise BHAS 1 mm thickness;

τIMIT- the actual time of the protective action of the material dropwise BHAS;

L is the actual thickness of the sample of the test material, mm.

The equation for calculating time of protective action materials facial masks parts (1 mm thickness) dropwise β,β'-dichloromethylsilane using data on butyl-β-chloridesulfate is:

The conversion factor for the material of the front parts made of rubber based on natural rubber, is 0.67, and for rubbers, made on the basis of synthetic isoprene rubber, is 0.55.

The test results showed that butyl-β-heoretically less toxic than the β,β'-dichloromethylene, and in reactions with salt thymolphthalein in ethanol solution (reagent T-135) gives a stable indication of the effect.

The main advantage of the present invention is that:

instead of β,β' - dichloromethylsilane use less toxic substance - butyl-β-heoretically;

quantitative determination of penetrating the sample material butyl-β-chloridesulfate is photocolorimetric method of analysis with a limit of sensitivity of 1·10-3mg/ml and what okresnosti, not exceeding 15%;

the method allows to conduct research on the evaluation time of protective action not only rubberized fabric, but materials facial masks parts (rubber) of different thickness with regard to inhalation component.

The method of evaluation of the protective properties of the materials of the facial parts masks for β,β'-dichloromethylsilane, which consists in applying to one side of the material of the front of the mask drops simulator - butyl-β-chloridesulfate with subsequent analytical determination of the point of accumulation for the sample limit of the simulator, wherein the butyl-β-heoretically after the test sample is captured sorption substrate, its quantification is performed using photocolorimetric analysis method with a limit of detection sensitivity butyl-β-chloridesulfate 1·10-3mg/ml with an error not exceeding 15%.



 

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