Like typical HP LC instruments, current ion chromatographs are usually made into individual unit components and then combined according to analysis requirements. The basic components are a flow compatibilizer, a high-pressure infusion pump, an injector, a chromatographic column, a detector, and a data processing system. In addition, mobile phase online degassing devices, automatic injection systems, mobile phase suppression systems, post column reaction systems, and fully automatic control systems can be configured as needed.