ABSTRACT
Goal: To study migration of toxic chemicals from water containters into stored waterMaterial and Methods:Experimental study was carried out in the Health Reference laboratory of Public Health Institute. In the study, as examples of water containers that are commonly used among population, the samples of water containers narrow opened container intended for keeping oil, aluminium container, large blue container (plastic), and metal container were purchased from Narantuul market and container with volume of 1 liter for potable water was purchased from supermarket and were tested. For determination of heavy metal migration, dissolving soultion or 3% In the solution of 3% chloric acid and for determination of hygiene parameters 3% acidic acid were used, respectively. In the solution of 3% chloric acid 6 heavy metals including iron (Fe), copper (Cu), zinc (Zn), lead (Pb), cadmium (Cd) and manganese (Mn) were determined by Varian 210 D AAS-10 in accordance with the method stated in the standard of GOST 5370-50. In the solution of 3% chloric acide the content of formalyne was determined by qualitative method of Shiph and quantative titration methodr, ethylen and salicilic acid by qualitative method, oxidation of organic matters by bichromate titration method and formaldehyde by iodometer method, respectively. Results of analysis were processed by Origin 7.0 software.Conclusions:1. The migration of lead from oil container and large blue plastic container as used for water storage and carriage was detected 500-800 times higher in oil container and 60-72 times higher in large blue plastic container than the acceptable maximum limit of WHO reference level and drinking water standard MNS900:2005 (0.01mg/l). 2. The migration of formaldehyde from plastic containers to food products was 1800-3900 times higher in oil container and 3600-6900 times higher in large blue container than the acceptable maximum limit of formaldehyde migration (formaldehyde 0.1 mg/l). Also 27,0-39,17 mg/l of formalin were determined in the oil container and37,67-53,43 mg/l of formalin were measured in large blue plastic container and its concentration increased over time of storage. It shows that these plastic containers can not be used for keeping drinking water and food products. 3. Lead (122-250 times higher) and cadmium (10-53 times higher) migration from aluminum container was higher than the acceptable maximum limit of national standard NMS 900-2005.4. Iron (58-90 times higher), lead (240-360 times) and cadmium (33-70 times) migration from metal container were detected higher than the acceptable maximum limit of national standard NMS 900-2005.5. The migration of formaldehyde from pure water container was 2922-28000 times higher than the acceptable maximum limit of Russian’s hygienist direction approved in 1971 (reference level is 0.1mg/l of formaldehyde).