Analyze rainwater, drinking water, and air particulate leach solutions directly with no sample preparation (other than filtering and possibly diluting).
Filter groundwater, surface water, and wastewater samples before injection, unless samples are filtered after collection.
Before injection, pretreat samples that may contain high concentrations of interfering substances by putting them through Thermo Scientific™ Dionex™ OnGuard™ cartridges. For instructions, refer to the cartridge manual.