several studies in the soviet union have suggested that elevated methaemoglobin levels from ingested nitrate may not be confined to the young infant and have reported an association between increased methaemoglobin levels of up to 7 % in schoolchildren and drinking water with a nitrate concentration of 23-204 mg/l no3-n. an epidemiologic study of 102 children aged 1-8 conducted in washington county , illinois , did not show that ingestion of water with a nitrate concentration of 22-111 mg/l no3-n was related to increasing methaemoglobin levels nor that the children had high or above normal methaemoglobin levels .
C0021270
infant
C0008059
children