[Experimental assessment of coal and rock dust absorbing hazardous substances released from synthetic resins]. / Eksperimental'naia otsenka sorbtsii ugol'noi i porodnoi pyl'iu vrednykh veshchestv, vydeliaiushchikhsia iz sinteticheskikh smol.

The experimental study evaluated the factors (temperature, mass of n polymer, time of sorption et al.) influencing coal and rock dust sorption of carbamide-formaldehyde, penopolyurethane monomers. The atmosphere of coal mines was proved to be contaminated during the extraction by multiple-component mixture, where the volatile monomers are gaseous, vaporous or absorbed by the dust particles.

[An improved method to determine chloride concentration in the air]. / Usovershenstvovannyi metod opredeleniia kontsentratsii khloridov v vozdukhe.

A reaction of chlorides with trivalent iron and mercuric rhodanide was suggested to be conducted in nonaqueous solvents so as to increase its sensitivity. After some trials the following medium was suggested: 60-70 vol.% acetic acid and 7-15 vol.% hydrochloric acid. Measurements limit -2.5 mg/m, measurements range -2.5-25.0 mg/m.

[Sanitary-hygienic assessment of polyurethane foam contents of KH-96 used in sealing of ventilation equipment in coal mines]. / Sanitarno-gigienicheskaia otsenka penopoliuretanovogo sostava KH-96, ispol'zuemogo dlia germetizatsii ventiliatsionnykh ustroistv podzemnykh vyrabotok.

The article contains a hygienic and chemical assessment of the KH-96 polymethane foam plastic material used in air hermetization in coal mines. A set of measures is proposed to ensure safety in working with the material.

[A photometric method for measuring the concentration of caustic alkalies in the air]. / Fotometricheskii metod izmereniia kontsentratsii edkikh shchelochei v vozdukhe.

The article contains a description of a new photometric technique of measuring caustic alkali content in the working zone air. The technique proved to be sensitive in the presence of carbonic acid gas (the lowest degree of measurements at 0.25 mg/m3 in 100 dm3 air sample).

[An improved method of measuring sulfur dioxide level in the air]. / Usovershenstvovannyi metod izmereniia kontsentratsii dioksida sery v vozdukhe.

Out of a set of tested stabilizers used in the photometric detection of sulphur dioxide by fuchs in formaldehyde reactions, trilon B solution was chosen in concentrations 2.5.10(-4)-1.10(-2) M as an absorbent solution and stabilizer. The proposed substitution of natrium tetrachlormercurate by trilon B provided greater stability of sulphur dioxide solution for 7 days and a higher absorbing activity (99.6-100%), avoiding working with highly poisonous substance which would require much time for synthesis.

[Photometric method of the detection of magnesium oxide in the working zone air after using magnesium caustic dust]. / Fotometricheskii metod opredeleniia oksida magniia v vozdukhe rabochei zony pri ispol'zovanii magnezial'nogo kausticheskogo porochka.

The contributors proposed a new highly sensitive selective technique of magnesium oxide detection, based on the Congo red and salicylic acid reaction. The minimal detection level is 0.25 mg of magnesium oxide in the analyzed sample volume. The range of measured concentrations varies from 0.01 to 0.4 mcg/ml. The express technique is simple and selective with Ca (II), Fe (III), AI (III).

[A photometric method for the determination of lead in washings]. / Fotometricheskii metod opredeleniia svintsa v smyvakh.

In a set of reactions used in photometric lead detection, the arcenaso III and sodium molibdate reaction was chosen for lead control, the measurement level being 0.1 micrograms/cm2 and the measurement range of 0.1-3 micrograms/cm2. The technique is applicable in presence of Fe+2, Fe+3, Al+3, Sn+4, Ni+2, Cr+2, Cr+6, Cd+2, Co+2, Zn+2.

[A photometric method for determining formaldehyde in the air using phenol-formaldehyde resins]. / Fotometricheskii metod opredeleniia formal'degida v vozdukhe pri ispol'zovanii fenolformal'degidnykh smol.

Photometric procedure of methanol determination based on its reaction with phenyl hydrazin and dinitride sulfanilic acid was developed. The procedure was highly sensitive (0.1 microgram in the analyzed volume) and selective in the presence of phenol, furyl alcohol, methanol and furfurol.