male f344 rats were given 0.05 % n-butyl-n- ( 4-hydroxybutyl ) nitrosamine in their drinking water for 4 weeks and then treated with basal diet containing 5 % aa plus 3 % sodium bicarbonate ( nahco3 ) , 5 % aa , 3 % nahco3 or 5 % sodium l-ascorbate ( sa ) , 5 % sa plus 1 % ammonium chloride ( nh4cl ) or 1 % nh4cl , or no added chemical for 32 weeks .
C0003968
aa
C0887557
sodium