Health risk for children from lead and cadmium near a non-ferrous smelter in Bulgaria.

In an interdisciplinary approach the exposure to lead and cadmium of the population living in the vicinity of a Bulgarian non-ferrous metallurgical plant was studied to determine the routes of exposure. Two exposed villages situated 4 and 6 km SW and W, respectively,--in the plume of the plant's emissions--and a village for comparison situated 14 km SE of the plant were selected for the study. The blood of children aged 3-13 years from the exposed villages (n = 111) and the village for comparison (n = 18) was analyzed for lead (PbB) and cadmium (CdB) as well as for free erythrocyte protoporphyrin (FEP) and haematological parameters.

[Hygienic research on new soap preparations for intensive laundry use].

The purpose of the study is to establish hygienic properties of the new preparations for intensive washing and their effect on the skin of man. Examinations are performed on 5 new washing preparations from firm "Verila": "Linda" (from the producer and from the trade network from the country--Ruse, Blagoevgrad, Stara Zagora, Pleven, Cherven Bryag, Plovdiv and Dobrich), recipe No 1, 2, 3 and 4. Sanitary and chemical examinations are carried out: organoleptic indices, nonionogenic surface active substances, total content of surface active substances, content of carbamide, sodium carbonate, ammonium nitrate, formaldehyde and free alkali.

[Epidemiological examinations of the workers at a thermoelectric power station].

Medical and clinico-laboratory examinations were performed of thermoelectric power station (TES) workers who were exposed to the hazardous factors related to the technological process and contamination substances transferred from other industrial sites. Following prepathologic and pathologic states were registered: respiratory functional disorders, ischemic heart disease, arterial hypertension, audiometric state deviations and acoustic nerve neuritis, irritative dermatitis. Basing on the data obtained, risk groups identification was performed.

[Biochemical liver studies of workers in ethylenediamine production].

Studies are performed on 44 workers, engaged in the production of ethylenediamine. The principle chemical noxae are: ammonia, ethylenediamine, dichloroethane, analogues of ethylenediamine, vinylchloride, sodium hydrate etc. The average concentrations of these compounds surpass the admissible norms for the air of the working environment.

[A hygienic study of new raw materials for cosmetic agents and household chemical preparations].

Studies are performed on the new Bulgarian raw materials "Aminookis" (AO) and "Dezodorirashch agent" (DA) the plants "Alen Mak"--Plovdiv and "Hyaluron"--Sofia. Chemical, toxicological and microbiological studies are carried out. Thin-layer chromatographic and spectrophotometric methods for determination of AO, hyaluronic acid and DA are developed and chemical studies on cosmetics, prepared with them, are carried out.