Chemical changes in sea water off Plymouth during 1957

Abstract

Analyses of sea water collected during 1957 at the International Hydrographic Station E1 (lat. 50° 02′ N., long 4° 22′ W.) are given here in the same form as in earlier reports (Armstrong, 1954, 1955, I957> 1958). The methods of collection and of analysis for phosphorus and silicon are substantially unchanged. Some analyses were made for ammonia by a vacuum distillation method (Riley, 1953), and for inorganic nitrogen (nitrate + nitrite + ammonia) by reduction of nitrate and nitrite with nickel (Riley & Sinhaseni, 1957) to ammonia, which was vacuum distilled. Salinities were determined by the Government Chemist's Department.We wish to express our thanks to Lt.-Cdr. C. A. Hoodless and the crew of R.V. ‘Sarsia’ and to Capt. W. J. Creese and the crew of R.V. ‘Sula’, for assistance at sea.