RESUMEN
A study is performed on the background content of soil samples from experimental platforms in districts of catchment area at different heights from 1400 to 2000 m.in the ecological reservation Parangalitsa, Rila Mountains. The investigation is carried out after 19 chemical indices--cations, anions and 9 heavy metals. The generalized statistical data for a period of 2 years characterize the examined soils as background pure and this give a contribution to the total ecological assessment of this naturally clean district of this country.
Asunto(s)
Suelo/análisis , Altitud , Bulgaria , Ecología , Monitoreo del AmbienteRESUMEN
The authors determine the content of nitrates in soil samples and the vegetables grown on them (lettuce, spinach, onion, garlic) via sensitive spectrophotometric methods with phenodisulphonic acid and reduction with cadmium column. The lowest nitrates content was established in the soil samples and vegetables grown by AIC, followed by the private arms, and the highest - in the green-horse vegetables and soil samples, owing mainly to the technology of production.
Asunto(s)
Nitratos/análisis , Suelo/análisis , Verduras/análisis , BulgariaRESUMEN
A study was carried out on soils for heavy metals content in the region of one of the largest scale enterprises in the country - Copper Extraction Plant "G. Damjanov", Srednogorie town. A sensitive method was used with atom absorption spectrophotometer Perkin Elmer, Model 272, for the determination of the heavy metals investigated: manganese, nickel, zinc, copper, lead and cadmium. The authors investigated soil samples from two horizones: from 0.30 and from 30-60, comparing the results obtained with those in control "pure" soils and with the existing maximum allowable concentration (MAC). Elevation of the quantity of heavy metals in the soils was established, being best manifested with copper and lead, 90% of the samples containing copper over MAC, and with lead-over 33%.