Automatic analyzer for trace nitrate or nitrite in seawater

The utility model discloses an automatic analyzer for trace nitrate or nitrite in seawater. The automatic analyzer comprises an automatic sample feeding part, a solution conveying part, a chemical flow path, a detector and a data processing work station, the chemical flow path comprises an electric multi-position valve, five peristaltic pump pipes, a winding reaction pipe, a tee joint, a capillaryconnecting pipe, a sample ring, a container bottle and a flow cell; the electric multi-position valve is provided with at least six connectors and has two states. Wherein the first state is a sampleloading state, and the second state is a sample injection state. The automatic analyzer for trace nitrate or nitrite in seawater disclosed by the utility model can continuously and automatically testa sample, and the test speed is up to 15 samples/h; the test sensitivity is high, the linear range is 0.25 mu g/L and 15 mu g/L, the detection limit can be reduced to 0.2 mu g/L, and the accuracy is good; precision is high, and