At the start of the day ensure all solutions and frozen samples reach ambient • laboratory temperature. Prepare fresh reagents for the analytes that are to be tested for the day as • well as fresh standards and intermediate standards. Flush the system for 15 minutes with carrier solution water and reagents - • ensure that the cadmium column is not switched in, The carrier solution is matched as closely as possible to the sample salinity • i.e. Artificial Sea Water (ASW)or pure reagent grade water (PW) – Use this time to complete preparation of fresh reagents. • After 2 minutes turn the cadmium column in to refresh the buffer, or make a • fresh cadmium column. The chemistries which are used by the Hobart hydrochemistry group, are • methods developed by Lachat and run directly as outlined in the following list: QuickChem Method 31-115-01-1-I Determination of Orthophosphate by Flow Injection Analysis QuickChem Method 31-107-04-1-A Determination of Nitrate in brackish or seawater by Flow Injection Analysis QuickChem Method 31-114-27-1-D Determination of Silicate by Flow Injection Analysis QuickChem Method 31-107-06-4-A Determination of Ammonia in Brackish or Seawater by flow injection analysis (To be increased in sensitivity by further CMAR modifications) Once the system is stable usually only 15 minutes or so, the run can • – be started. At the end of the day/run the system is flushed for about 15 minutes • on reagent grade water, and then shut down.
• At the start of the day ensure all solutions and frozen samples reach ambient laboratory temperature. • Prepare fresh reagents for the analytes that are to be tested for the day as well as fresh standards and intermediate standards. • Flush the system for 15 minutes with carrier solution water and reagents - ensure that the cadmium column is not switched in, • The carrier solution is matched as closely as possible to the sample salinity – i.e. Artificial Sea Water (ASW)or pure reagent grade water (PW) • Use this time to complete preparation of fresh reagents. • After 2 minutes turn the cadmium column in to refresh the buffer, or make a fresh cadmium column. • The chemistries which are used by the Hobart hydrochemistry group, are methods developed by Lachat and run directly as outlined in the following list: QuickChem Method 31-115-01-1-I Determination of Orthophosphate by Flow Injection Analysis QuickChem Method 31-107-04-1-A Determination of Nitrate in brackish or seawater by Flow Injection Analysis QuickChem Method 31-114-27-1-D Determination of Silicate by Flow Injection Analysis QuickChem Method 31-107-06-4-A Determination of Ammonia in Brackish or Seawater by flow injection analysis (To be increased in sensitivity by further CMAR modifications) • Once the system is stable – usually only 15 minutes or so, the run can be started. • At the end of the day/run the system is flushed for about 15 minutes on reagent grade water, and then shut down.
AA_NRS_BGC_Handbook_ver2.2.docx