Applications of flow techniques in seawater analysis: A review

Ma, Jian; Yuan, Dongxing; Lin, Kunning; Feng, Sichao; Zhou, Tong; Li, Quanlong

doi:10.1016/j.teac.2016.02.003

Cited by 48 publications

(13 citation statements)

References 96 publications

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“…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).…”

Section: Laboratory Benchmark Techniques For Nutrient Analysis In Seamentioning

confidence: 99%

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

et al. 2020

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Section: Laboratory Benchmark Techniques For Nutrient Analysis In Seamentioning

confidence: 99%

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

et al. 2020

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“…Dissolved oxygen is an indispensable substance for the aquatic organism and a vital parameter to characterize the metabolism of marine ecosystems [73][74][75]. The DO content in seawater is influenced by biochemical and physiological activities.…”

Section: Domentioning

confidence: 99%

Autonomous and In Situ Ocean Environmental Monitoring on Optofluidic Platform

et al. 2020

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Determining the distributions and variations of chemical elements in oceans has significant meanings for understanding the biogeochemical cycles, evaluating seawater pollution, and forecasting the occurrence of marine disasters. The primary chemical parameters of ocean monitoring include nutrients, pH, dissolved oxygen (DO), and heavy metals. At present, ocean monitoring mainly relies on laboratory analysis, which is hindered in applications due to its large size, high power consumption, and low representative and time-sensitive detection results. By integrating photonics and microfluidics into one chip, optofluidics brings new opportunities to develop portable microsystems for ocean monitoring. Optofluidic platforms have advantages in respect of size, cost, timeliness, and parallel processing of samples compared with traditional instruments. This review describes the applications of optofluidic platforms on autonomous and in situ ocean environmental monitoring, with an emphasis on their principles, sensing properties, advantages, and disadvantages. Predictably, autonomous and in situ systems based on optofluidic platforms will have important applications in ocean environmental monitoring.

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“…Total nitrogen (TN) is an important indicator for water quality determination and on-line monitoring [1]. The excess of nitrogen in natural waters may cause eutrophication, which is one of the most serious threats to the aquatic ecosystems, and even do harm to human healthy [2].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters

et al. 2020

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Over the past two decades, the alkaline persulfate oxidation (PO) with thermal and/or ultraviolet (UV) assisted digestion method has been widely used for digestion of nitrogen containing compounds (N-compounds) in water quality routine analysis in laboratory or on-line analysis, due to its simple principle, high conversion rate, high percent recovery, low-cost. However, this digestion method still has some inevitable problems such as complex operations, high contamination potential, batch N blanks, higher reaction temperature (120-124 • C) and time-consuming (30-60 min). In this study, ozone (O 3 ) was selected as the oxidant for digestion of N-compounds through analysis and comparison firstly. Secondly, we proposed and compared the UV and/or ultrasound (US) combined with ozone (UV/O 3 , US/O 3 and UV/US/O 3 ) synergistic digestion methods based on O 3 with sole O 3 oxidation method on digestion efficiency (digestion time and conversion rate) of standard N-compounds. Simultaneously, the influence of reaction temperature, pH of water sample, concentration of O 3 and mass flow rate, UV intensity, US frequency and power on digestion efficiency were investigated, and then the optimum parameters for digestion system were obtained. Experimental results indicated that UV radiation can effectively induce and promote the decomposition and photolysis of O 3 in water to generate hydroxyl radicals (•OH), while US can promote the diffusion and dissolution of O 3 in water and intensify the gas-liquid mass transfer process for the reaction system. Meanwhile, results showed that the UV/US/O 3 synergistic digestion method had the best digestion efficiency under the optimum conditions: water sample volume, 10 mL; pH of water sample, 11; O 3 mass flow rate, 3200 mg/h; reaction temperature, 30 • C; digestion time, 25 min; UV lamp power, 18 W; distance between UV lamp and reactor, 2 cm; US frequency, 20 kHz; US power, 75 W. The conversion rate (CR) of synthetic wastewater samples varied from 99.6% to 101.4% for total dissolved nitrogen (TDN) in the range of 1.0~4.0 mg/L. The UV/US/O 3 synergistic digestion method would be an effective and potential alternative for digestion of N-compounds in water quality routine analysis in laboratory or on-line analysis.

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Applications of flow techniques in seawater analysis: A review

Cited by 48 publications

References 96 publications

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

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

Autonomous and In Situ Ocean Environmental Monitoring on Optofluidic Platform

Investigations on Ozone-Based and UV/US-Assisted Synergistic Digestion Methods for the Determination of Total Dissolved Nitrogen in Waters

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