| 摘要 |
The influence of contamination or carry-over can be reduced even if a mobile phase flows in an analysis flow channel at a low flow rate. A surface of a flow channel (7a) in a needle (7) is mechanically polished, so that a surface roughness (Ra) thereof is, for example, equal to or lower than 0.2 μm. The surface of the flow channel (7a) may be polished by passing a fine wire coated with abrasive grains through a hole of the needle 7 and moving the wire reciprocally in the hole.
|
