9027.20.80.60 - Liquid chromatographs 🖩
Details
| Field | Value |
|---|---|
| Unit of Quantity | No. |
| General Rate of Duty (Column 1 - General) | Free |
| Special Rate of Duty (Column 1 - Special) | N/A |
| Column 2 Rate of Duty | 40% |
| Quota Quantity | N/A |
| Additional Duties | N/A |
Overview
This classification pertains to liquid chromatographs, a type of analytical instrument used to separate, identify, and quantify components within a liquid mixture. These instruments employ a liquid mobile phase that is pumped through a stationary phase, typically a column packed with solid particles. Differential interactions between the sample components and the stationary phase lead to their separation over time, allowing for subsequent detection and analysis. Examples include High-Performance Liquid Chromatographs (HPLC) and Ultra-High-Performance Liquid Chromatographs (UHPLC).
The distinction between this category and its sibling, 9027.20.80.30 (Gas chromatographs), lies in the mobile phase used. While gas chromatographs utilize an inert gas as the mobile phase, liquid chromatographs specifically employ a liquid mobile phase. This difference in operational principle dictates the types of compounds each instrument is best suited to analyze, with liquid chromatography generally being preferred for non-volatile or thermally labile compounds.
As a leaf node, 9027.20.80.60 does not have further subdivisions. Classification under this heading is therefore determined by the fundamental operational characteristic of employing a liquid mobile phase for chromatographic separation. No further distinctions are made at this level regarding specific detection methods or advanced features, which would be captured by more detailed national subdivisions if they existed.