Diffusive gradients in thin films (DGT) test device for lake water and test method using same

A diffusive gradients in thin films (DGT) test device for lake water, comprising:

• a floating ball;
• and
• a plurality of water sampling units arranged below the floating ball in sequence along a vertical direction, wherein, every two adjacent water sampling units are connected to each other via a rope, and the topmost water sampling unit is connected to the floating ball also via a rope;
• a DGT detection device, a water quality detection device with a multi-parameter probe, and a water sampling device are disposed in each of the water sampling units;
• and
• each water sampling device comprises:
• a plurality of sampling bottles, wherein, each of the sampling bottles is provided with an inlet pipe and an exhaust pipe;
• and each of the inlet pipes and exhaust pipes is provided with a one-way solenoid valve;
• a peristaltic pump, wherein, a water sample outlet of the peristaltic pump connected to the inlet pipes of the plurality of sampling bottles via a first multi-way connector;
• and the exhaust pipes of the plurality of sampling bottles are connected to an exhaust manifold via a second multi-way connector;
• and
• a control device connected to the peristaltic pump and the one-way solenoid valve on each of the inlet pipes and exhaust pipes.