Flow-Injection Methods in Water Analysis—Recent Developments

Trojanowicz, Marek; Pyszynska, Marta

doi:10.3390/molecules27041410

Cited by 18 publications

(4 citation statements)

References 171 publications

(250 reference statements)

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“…41 The sample volume in the FIA system is commonly in the range of 0.05–0.1 mL. 42 Therefore, the optimal sample volume of 0.1 mL was selected.…”

Section: Resultsmentioning

confidence: 99%

Precise evaluation of batch adsorption kinetics of plant total polyphenols based on a flow-injection online spectrophotometric method

Guo,

Muhammad,

Aimaiti

et al. 2024

Anal. Methods

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“…41 The sample volume in the FIA system is commonly in the range of 0.05–0.1 mL. 42 Therefore, the optimal sample volume of 0.1 mL was selected.…”

Section: Resultsmentioning

confidence: 99%

Precise evaluation of batch adsorption kinetics of plant total polyphenols based on a flow-injection online spectrophotometric method

Guo,

Muhammad,

Aimaiti

et al. 2024

Anal. Methods

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“…The experimental process occurred in a closed system, which accelerated the analysis time and reduced pollution, helping ensure the safety of experimental personnel. Steps in the operation that were challenging, such as manual distillation and extraction, were unnecessary 22 , 32 . The instrument's pipeline and accessories, however, are complicated, and several factors may influence the test results, making it simple to cause system instability.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous determination of volatile phenol, cyanide, anionic surfactant, and ammonia nitrogen in drinking water by a continuous flow analyzer

Qin

Zou

et al. 2023

Sci Rep

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This study developed a method for the simultaneous determination of volatile phenol, cyanide, anionic surfactant, and ammonia nitrogen in drinking water, using a continuous flow analyzer. The samples were first distilled at 145 °C. The phenol in the distillate then subsequently reacted with alkaline ferricyanide and 4-aminoantipyrine to form a red complex that was measured colorimetrically at 505 nm. Cyanide in the distillate subsequently reacted with chloramine T to form cyanogen chloride, which then formed a blue complex with pyridinecarboxylic acid that was measured colorimetrically at 630 nm. The anionic surfactant reacted with basic methylene blue to form a compound that was extracted into chloroform and washed with acidic methylene blue to remove interfering substances. The blue compound in chloroform was determined colorimetrically at 660 nm. Ammonia reacted with salicylate and chlorine from dichloroisocyanuric acid to produce indophenol blue at 37 °C in an alkaline environment that was measured at 660 nm. The relative standard deviations were 0.75–6.10% and 0.36–5.41%, respectively, and the recoveries were 96.2–103.6% and 96.0–102.4% when the mass concentration of volatile phenol and cyanide was in the range of 2–100 μg/L. The linear correlation coefficients were ≥ 0.9999, and the detection limits were1.2 μg/L and 0.9 μg/L, respectively. The relative standard deviations were 0.27–4.86% and 0.33–5.39%, and the recoveries were 93.7–107.0% and 94.4–101.7%. When the mass concentration of anionic surfactant and ammonia nitrogen was 10–1000 μg/L. The linear correlation coefficients were 0.9995 and 0.9999, and the detection limits were 10.7 μg/L and 7.3 μg/L, respectively. When compared to the national standard method, no statistically significant difference was found. This approach saves time and labor, has a lower detection limit, higher precision and accuracy, less contamination, and is more appropriate for the analysis and determination of large-volume samples.

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“…Steps in the operation that are challenging, like distillation and extraction, are skipped. More and more, it is obvious what advantages come from detecting lots of examples 22,30 . The instrument's pipeline and accessories, however, are complicated, and a number of factors in uence the test results, making it simple to cause system instability.…”

Section: Comparison With National Standard Methodsmentioning

confidence: 99%

Simultaneous determination of volatile phenol, cyanide, anionic surfactant and ammonia nitrogen in drinking, ground and surface water and in wastewater applying continuous flow analyzer

Qin

Zou

et al. 2022

Preprint

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The present study aimed to develop a method for the simultaneous determination of volatile phenol, cyanide, anionic surfactant, and ammonia nitrogen in drinking, ground and surface water, as well as in wastewater, using a continuous flow analyzer. Using on-line distillation, the distillate reacts with 4-aminoantipyrine in the presence of basic potassium ferricyanide, and the amount of volatile phenol is assessed using spectrophotometry. The distillate combines with chloramine-T and then with isonicotinic acid pyrazolone to generate blue chemicals through on-line distillation. The amount of cyanide is measured using spectrophotometry and extracted on-line, the amount of anionic surfactants was measured using methylene blue spectrophotometry and extracted on-line, and ammonia is reacting with salicylate and chlorine from dichloroisocyanuric acid to produce indophenol blue at 37°C in an alkaline environment and measured at 660 nm. The relative standard deviations were 0.75%~ 2.80% and 0.36% ~ 2.26%, respectively, and the recoveries were 98% ~ 103.6% and 101% ~ 102% when the mass concentration of volatile phenol and cyanide is 2 µg/L ~ 100 µg/L, the linear correlation coefficients are greater than or equal to 0.9999, and the detection limits are 1.2 µg/L and 0.9 µg/L, respectively. The relative standard deviations were 0.27% ~ 0.96% and 0.33% ~ 3.13%, and the recoveries were 94.3% ~ 107.0% and 98.0% ~ 101.7%. The mass concentration of anionic surfactant and ammonia nitrogen is 10 µg/L ~ 1000 µg/L, the linear correlation coefficients are 0.9995 and 0.9999, and the detection limits are 10.7 µg/L and 7.3 µg/L, respectively. This approach saves time and labor, has a lower detection limit, higher precision and accuracy, less contamination, and is more appropriate for the analysis and determination of large amounts of samples. When compared to the national standard method, the difference was not statistically significant.

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Flow-Injection Methods in Water Analysis—Recent Developments

Cited by 18 publications

References 171 publications

Precise evaluation of batch adsorption kinetics of plant total polyphenols based on a flow-injection online spectrophotometric method

Precise evaluation of batch adsorption kinetics of plant total polyphenols based on a flow-injection online spectrophotometric method

Simultaneous determination of volatile phenol, cyanide, anionic surfactant, and ammonia nitrogen in drinking water by a continuous flow analyzer

Simultaneous determination of volatile phenol, cyanide, anionic surfactant and ammonia nitrogen in drinking, ground and surface water and in wastewater applying continuous flow analyzer

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