Roughly 40kg per minute holding (eg 30 min final reserve fuel is ca 1200kg)
Expect to use about minimum 600kg extra for a go-around and second approach without additional delay and depending on the length of the missed approach procedure.
APU uses about 150kg/hour ballpark figure
For remote de-icing with engines running with no extra delay add about 300kg, if deicing on stand, see APU burn figure for about 15 min extra if no delay.