In-situ passive sampling device based on physical and chemical and bio-coupling monitoring and application

An in-situ passive sampling device based on physical and chemical and bio-coupling monitoring, comprising an upper unit and a lower unit,

• the upper unit comprises a foam plastic tray (1) floating on a water surface, a bracket (2) on the foam plastic tray (1), and a power supply device (3) on the bracket (2), a microcontroller (4), a suction pump (5) and an automatic feeding box (6), the power supply device (3) supplies power to the suction pump (5) and the automatic feeding box (6) respectively, the microcontroller (4) is configured for timing switch control of the suction pump (5) and the automatic feeding box (6);
• the lower unit comprises a support connecting device (7), a fish farming device (8), a sampling device (9), and the support connecting device (7) comprises a central post (71), a connecting rod (72), a feed pipe (73), a plastic hose (74), an upper surface of the central post (71) is connected to a lower bottom surface of the foam plastic tray (1) by a plurality of cables (10), and the central post (71) is internally provided with a longitudinal through passage (710), a lower end of the plastic hose (74) is screwed to an upper end of the through passage (710), an upper end of the plastic hose (74) extends upward and penetrates the foam plastic tray (1), and is connected to an outlet of the suction pump (5) and an outlet of the automatic feeding box (6) respectively through a manifold (11), an upper end of the feed pipe (73) is screwed to a lower port of the through passage (710), and a middle and lower portions of the feed pipe (73) is provided with external threads, the connecting rods (72) are provided in three in total, and proximal ends of the connecting rods (72) are detachably connected to side walls of the central post (71), respectively;
• the fish farming device (8) comprises a fishbox body (81) and a fishbox cover (82), and the fishbox cover (82) and the fishbox body (81) are screwed to form a spherical structure, the fishbox cover (82) is provided with a thread hole (83) at a top, and a plurality of through holes (84) are provided around the thread hole (83), and the thread hole (83) is fitted with the external thread of the feed pipe (73), and an end of the feed pipe (73) is extended to an inner of the fishbox body (81), and fry (85) is inside the fishbox body (81),
• the sampling device (9) comprises a first fixing frame (91), a second fixing frame (92), a third fixing frame (93), the first fixing frame (91), a top of the second fixing frame (92), and the third fixing frame (93) are respectively connected to a respective distal end of each of the three connecting rods (72) by a respective lock (94), wherein the first fixing frame (91) is provided with a thin film diffusion gradient passive sampler (95), the second fixing frame (92) is provided with a semi-permeable membrane passive sampler (96), and the third fixing frame (93) is provided with a polar organic compound integrated sampler (97).