Application of flowing stream techniques to water analysis. Part I. Ionic species: dissolved inorganic carbon, nutrients and related compounds

Development of a Low-Cost SIA-Based Analyser for Water Samples

“…Automation of the analysis of water samples has been the subject of a significant number of papers published in the last years. Many of these works resort to some kind of flow-based technique [2–4]. However, most of the flow-based analysers proposed in the literature are dedicated systems focusing on the determination of one or two parameters in water samples [5–8], mainly for oceanographic research.…”

Toward a Harmonization for Using in situ Nutrient Sensors in the Marine Environment

“…Due to the significance of nutrient measurements in marine systems, they are among the most commonly analyzed parameters in oceanographic research. Since the publication of the first well known seawater nutrient analysis handbooks (Strickland and Parsons, 1972;Grasshoff, 1976), numerous comprehensive methods and reviews have been published (Miró et al, 2003;Motomizu and Li, 2005;Gray et al, 2006;Molins-Legua et al, 2006;Aminot and Kérouel, 2007;Aminot et al, 2009;Ma et al, 2016;Worsfold et al, 2016). The first guide suggesting best practice in performing nutrient measurements at sea was proposed by the WOCE in the early 1990s (Gordon et al, 1993).…”

A Simple, Low-Cost Double Beam Spectrophotometer for Colorimetric Detection of Nitrite in Seawater

“…Most of the methods for simultaneous determination of nitrite and nitrate are based on the reduction of nitrate to nitrite and subsequent colorimetric determination of the nitrite with the Griess reaction [12], [13]. The total amount of can be measured by passing the sample through a copper-coated cadmium column [14] in which the nitrate ion is heterogeneously reduced to nitrite ion (1) In order to determine the nitrate concentration, nitrite is first measured by the Griess reaction, then nitrate is reduced to nitrite to give the total concentration of nitrogen. The nitrate concentration is then calculated as the difference between the total inorganic nitrogen and nitrite.…”