| 摘要 |
An auto-sampler successively collects liquid samples from plural sample containers through a metallic needle. A surface of the needle is coated with a coating material having a chemical activity smaller than that of a parent metal material of the needle, and the coated surface is polished to have an average roughness of 10 to 20 nm. The coating material may include a precious metal or synthetic resin plated or deposited on the parent metal material, or a quartz thin film formed by chemical vapor deposition on the parent metal material. The coating film on the needle is polished with a mechanical or chemical polishing method.
|
