[The analysis of dosage inaccuracy and its minimization modes].

The article deals with the analysis of factors impacting dosage inaccuracy and input of this inaccuracy into total inaccuracy of analysis. The total dosage inaccuracy includes both the value of inaccuracy mentioned in the technical passport of dosage device and inaccuracy values occurring at all stages of dosage during implementation of technique. The characteristics of dosage devices and their merits and shortcomings are taken into account. The article substantiates the choice of types of dosage devices to be implemented in the laboratory research. The modes of errors elimination and inaccuracy minimization were analyzed against the perfectly calibrated and totally corresponded to passport data device of air transfer dosage.

[The toxicological hygienic evaluation of the manufacture of epoxy resins based on complex glycidyl ethers]. / Gigieno-toksikologicheskaia otsenka proizvodstva époksidnykh smol na osnove slozhnykh glitsidilovykh éfirov.

The workers engaged in the processing of the UP-671, UP-671D, UP-677, UP-680 and UP-682 epoxide resins are influenced by both initial and intermediate industrial products, as well as the resins' volatile components in MAC threshold concentrations. The workers engaged in major professions displayed upper respiratory allergic diseases, contact and allergic dermatitis, sensibilization to epichlorhydrine, staphylococci and kidney allergen. Euthyroid goiter was diagnosed in most workers, along with thriiodothyronine decrease in blood serum and a higher rate of chromosomal aberrations in lymphocytes. The experimental studies performed revealed moderate-degree toxicity in the resins, their cumulation properties, as well as allergenic, irritating, mutagenic and embryotoxic characteristics. Basing on the results of the study, the USSR Health Ministry adopted the working zone air MAC for the resins at the level of 0.5 mg/m3, vapours, 2nd degree of hazardousness.