Abstract: Apparatus for withdrawing liquid samples from liquid/solids media, e.g., phosphoric acid slurries, for the downstream analysis thereof, is comprised of (i) means adapted for insertion into a liquid/solids medium to selectively separate and receive a liquid fraction therefrom, (ii) a liquid storage first chamber in communicating relationship with said separating and receiving means (i), (iii) a liquid sample receiving second chamber in independent, parallel communicating relationship with said separating and receiving means (i) and which comprises means for exteriorly discharging sample contained therein, and (iv) means permitting the filling or emptying of said second chamber (iii) independently of said first chamber (ii).