in water

polarographic reduction;;

in ammonia Electrochem. Process; reduction at -1.2 V;;

KBH4 or NaBH4 in water byproducts: H3BO3, H(1+); regeneration of silver from cyanide electrolytes; pH value of a Ag(CN)2(1-) containing soln. was adjusted to 8 by addn. of dild. HNO3; addn. of the hydroborate dissolved in 0.01M NaOH; stirring at 20-25°C for 45-60 min.;;

in ammonia Electrochem. Process; reduction at -1.2 V;;

in water byproducts: CN(1-); silver film deposited on magnesium surface (or magnesium powder) under N2 at temp. 20-40 degree.C; silver film washed with water and acetone and dried in air at 80°C;