NOVELTY - An oil removal device for removing oil from a flow of oil-separated aqueous sample droplets, comprises: (i) a sample delivery channel for receiving the flow of the oil-separated sample droplets; (ii) an oil outlet channel for carrying away oil removed from the flow; (iii) at least one restricted opening between the sample delivery channel and the oil outlet channel; (iv) an aqueous flow channel for conducting a flow of aqueous liquid; and (v) an aqueous flow channel inlet between the sample delivery channel and the aqueous flow channel.    USE - The oil removal device, system and method are useful for removing oil from a flow of oil-separated aqueous sample droplets; for transferring a stream of aqueous material separated in a first separation apparatus to a second separation apparatus; and for transferring an aqueous analyte solution between a first separation apparatus and a second separation apparatus (all claimed).    ADVANTAGE - The device is highly efficient, reliable and easy to use.    DETAILED DESCRIPTION - An oil removal device for removing oil from a flow of oil-separated aqueous sample droplets, comprises: (i) a sample delivery channel for receiving the flow of the oil-separated sample droplets; (ii) an oil outlet channel for carrying away oil removed from the flow; (iii) at least one restricted opening between the sample delivery channel and the oil outlet channel; (iv) an aqueous flow channel for conducting a flow of aqueous liquid; and (v) an aqueous flow channel inlet between the sample delivery channel and the aqueous flow channel, which restricted opening is located downstream of the oil channel opening, for introducing the aqueous sample droplets into the aqueous flow channel; where the dimensions of the restricted opening are such that the oil flows into the oil outlet channel, but the aqueous sample droplets do not. INDEPENDENT CLAIMS are:    (1) a system for transferring a stream of aqueous material separated in a first separation apparatus to a second separation apparatus, the system comprising: (i) an encapsulation device for encapsulating successive portions of the stream received from the first separation apparatus as droplets between plugs of oil to provide a flow of oil-separated sample droplets; (ii) a conduit for transporting the flow of oil-separated sample droplets; and (iii) an oil removal device for receiving the flow of oil-separated sample droplets, the oil removal device comprising: (a) a sample delivery channel for receiving the oil-separated sample droplets from the conduit and delivering the sample droplets into an aqueous liquid stream flowing in a channel connectable to the second separation apparatus; (b) an oil outlet channel for carrying away removed oil; (c) at least one restricted opening between the sample delivery channel carrying the oil-separated sample droplets received from the conduit and the oil outlet channel; and (d) an aqueous flow channel; and    (2) a method for transferring an aqueous analyte solution between a first separation apparatus and a second separation apparatus, where: (i) encapsulating the analyte solution as droplets by an oil; (ii) conducting the oil and droplets of analyte solution from the first separation apparatus flow along a conduit; where each of the droplets is of such dimensions that it fills the inner volume of the conduit; and (iii) removing the oil from the analyte before the analyte reaches the second separation apparatus; where the oil removal step comprises: (a) pushing the oil-encapsulated droplets is pushed along the conduit, passing an oil outlet channel opening, towards an inlet of an aqueous flow channel, (b) the droplet being of such a length that when the leading end of the droplet is positioned at the aqueous flow channel inlet, it completely blocks the oil outlet channel opening, and (c) forcing the oil that separates two successive droplets through the oil outlet channel opening into the oil outlet channel, after the preceding droplet has started to enter into the aqueous flow channel.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of an oil removal device.    Encapsulation device (1)    Oil (2)    Oil flow channel (3)    Analyte (4)    T-junction (5)    Additive channel (6)    Second device (10)