{"id":2406,"date":"2014-12-16T08:35:21","date_gmt":"2014-12-16T13:35:21","guid":{"rendered":"https:\/\/web.uri.edu\/marinefacility\/?p=2406"},"modified":"2025-11-20T13:40:35","modified_gmt":"2025-11-20T18:40:35","slug":"lachat-nutrient-analyzer","status":"publish","type":"post","link":"https:\/\/web.uri.edu\/marinefacility\/lachat-nutrient-analyzer\/","title":{"rendered":"Astoria-Pacific nutrient analyzer"},"content":{"rendered":"

<\/p>\n

General Info<\/h2>\n

The MSRF performs dissolved nutrient analysis on aqueous samples using an Astoria Pacific Segmented Flow Analyzer.<\/p>\n

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We are currently equipped to analyze five nutrients: ammonium, phosphate, silicate, nitrite and total nitrite+nitrate. The following table lists the methods used for each nutrient as well as our minimum detection limits (MDL) in seawater.<\/p>\n\n\n\n\n\n
Nutrient<\/th>\nMethod<\/th>\nConcentration range (uM)<\/th>\nMDL (uM)<\/th>\n<\/tr>\n<\/thead>\n
Ammonium<\/td>\n\n\n\n<\/colgroup>\n\n\n\n
A026 Rev D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n0 – 40<\/td>\n0.10<\/td>\n<\/tr>\n
Phosphate<\/td>\n\n\n\n<\/colgroup>\n\n\n\n
A205 Rev A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n0 – 10<\/td>\n0.02<\/td>\n<\/tr>\n
Silicate<\/td>\n\n\n\n<\/colgroup>\n\n\n\n\n
A221 Rev C<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n0 – 100<\/td>\n0.05<\/td>\n<\/tr>\n
Nitrite<\/td>\nA182 Rev D<\/td>\n0 – 20<\/td>\n0.02<\/td>\n<\/tr>\n
Nitrite+Nitrate<\/td>\n\n\n\n<\/colgroup>\n\n\n
A177 Rev F<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n0 – 20<\/td>\n0.05<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

An example at the MSRF<\/h2>\n

The figures below illustrate a nutrient profile obtained from a CTD cast conducted on board the R\/V Endeavor<\/em> in June of 2016. The cast was carried out at the continental shelf break (approximately 39\u00b046.209’N and 70\u00b051.436’W) as part of a study examining carbon and particle fluxes down the water column.<\/p>\n