The oral LD5o of NaNO2 for rats was found to be 0.15 g per kg body weight. The methemoglobin level increased to 45-80%, 1 h after the administration of the LD5o dose and returned to the normal level after 24 h. The dose-maximum methemoglobin concentration curve was found to be Sshaped. Formation of nitrosyl hemoglobin preceded that of methemoglobin, its maximum concentration being a quarter of that of the latter derivative. In rats receiving 0.5% NaNO2 as drinking water, the concentration of methemoglobin showed a characteristic daily change (4 to 88%) due to the circadian rhythm of the animal in drinking. After 6 months, slight nitrosyl hemoglobin production, Heinz body formation, anisocytosis, and hypohemoglobinemia were observed.
|ジャーナル||International Archives of Occupational and Environmental Health|
|出版ステータス||Published - 1980 6|
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