Patent ID: 8234939

Claim:
A sample introduction method, comprising: providing a sample introduction device comprising a flow path switching valve and a moving mechanism, wherein the flow path switching valve is connected to a flow path in communication with a liquid feeder for delivering a solution, a flow path in communication with a sample loop provided with the needle at a tip section of the sample loop, a flow path in communication with an analysis section for analyzing samples, and a flow path in communication with an injection port inserted with the needle, the flow path switching valve switches between the first status, in which the liquid feeder is in communication with the analysis section through the sample loop and the injection port, and the second status, in which, the liquid feeder is in communication with the analysis section not through the sample loop and the injection port, the moving mechanism enables the needle to move between the position for drawing samples and the injection port; switching the flow path switching valve from a first status to a second status; actuating the moving mechanism to move a needle to a position for drawing samples and draw a specified volume of samples with the needle; actuating the moving mechanism to move the needle to a position for drawing an intermediate liquid and draw a specified volume of intermediate liquid with the needle; actuating the moving mechanism to move the needle away from the position for drawing the intermediate liquid and insert the needle into an injection port; and performing an operation of drawing the samples inside the needle into the sample loop, before the moving mechanism is actuated to move the needle away from the position for drawing the intermediate liquid and insert the needle into the injection port.