In 2023, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured immediately on board using a Secchi Disk. Salinity, dissolved inorganic nutrients, pH and oxygen were measured from a bucket sample in the laboratory. Further information regarding the methodology and the devices used can be found in the metadata description.

The photometer, with which the nutrients have been analysed, has been replaced. Until 2023-08-16 device "Spectrophotometer, Hitachi, U-1100" with link https://registry.o2a-data.de/items/12101 has been used. From 2023-08-17 onwards device "Spectrophotometer, Varian, Cary 4000" with link https://registry.o2a-data.de/items/12104 has been in use.