用Ar~+激光器的4880A作光源,研究了各种因素对光化学还原U(Ⅵ)的量子产额Φ的影响。当[U(Ⅵ)=0.05M,[HCOOH]<3M,Φ随[HCOOH]增大而增大;[HCOOH]>3M,Φ趋近于0.47;[HCOOH]<0.01M,Φ很小。但I_f~0/I_f与[HCOOH]呈线性关系,K_(sv)=388M~(-1),表明HCOOH对UO_2~(2+)荧光有强烈的物理猝灭作用。当[U(Ⅵ)]=0.05M,并维持[HCOOH]/[NaCOOH]=5,Φ随[NaCOOH]增大而增大,并趋近于0.5。同时 The effect of various factors on the quantum yield Φ of photochemical reduction of U (Ⅵ) was studied by using 4880A Ar + laser as a light source. When [U (Ⅵ) = 0.05M, [HCOOH] <3M, Φ increases with [HCOOH] increasing; [HCOOH]> 3M, Φ approaching 0.47; [HCOOH] <0.01M, Φ is small. However, there was a linear relationship between I_f ~ 0 / I_f and [HCOOH], K sv = 388M -1, indicating that HCOOH had a strong physical quenching effect on UO_2 2+ fluorescence. When [U (Ⅵ)] = 0.05M and [HCOOH] / [NaCOOH] = 5, Φ increases with [NaCOOH] and approaches 0.5. Simultaneously