[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.

[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).