Collection of Indonaphthol Blue on a Membrane Filter for the Spectrophotometric Determination of Ammonia with 1-Naphthol and Dichloroisocyanurate

Shoji, Takashi; Nakamura, Eiko

doi:10.2116/analsci.26.779

Cited by 14 publications

(3 citation statements)

References 17 publications

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“…The salicylate method is one of the indophenol blue (IPB) methods, which are based on the Berthelot reaction first reported in 1859 [ 1 ]. Many modifications have been performed, including to the reactants, the catalysts, the masking agents, and so on [ 1 , 14 , 15 , 16 , 17 ]. The final colors of the reaction products are blue, blue-green, or green, depending on the different reagents and reaction conditions.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

Xia

Zhou³

et al. 2022

Molecules

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The traditional method for the determination of protein in food needs the operations of digestion, distillation, absorption, and titration; therefore, it is complicated and time-consuming and requires professional personnel. Is there a more convenient and faster detection method that can directly determine the ammonium ions in protein digestion solution to obtain the protein content of food and avoid the distillation–absorption–titration process? The feasibility of water ammonium ion test kits for food protein rapid detection was discussed here. After digestion, the protein in food transforms into ammonium ions in the digestion solution. Because of the variety of food, there are many different inorganic ions left in the food digestion solution, and at the same time, digestion agents are added in the digestion process and become potential interference factors in ammonium determination. Therefore, the detection accuracy of ammonium test kits needs to be evaluated first, including their anti-interference ability. The standard curve of ammonium was established by the test kit. When the ammonium concentration was 0.00–2.50 mg/L, the absorbance at 620 nm was linearly related to the ammonium concentration, the determination coefficient R2 was 0.9995, and the detection limit of this method was 0.01 mg/L. The influences of temperature, pH value, and reaction time on the test kit method were discussed. The precision was 0.90–3.33%; the repeatability was 1.71–4.86%; and the recovery rate of tap water, river water, and sea water was controlled within 90–103%. The anti-interference ability of the evaluated test kit was better than that of the national standard detection method. The test kit, combined with sample pretreatment and protein conversion formula, was used to detect protein in different types of food (milk powder, rice flour, wheat flour, soy, banana, milk, fish food, chicken food, and dog food). The results showed that there were no significant differences (ρ > 0.05) between the national method and the test kit method. The ammonium ion test kit method shortened the determination time and had higher sensitivity, showing its potential for the rapid determination of food protein.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

Xia

Zhou³

et al. 2022

Molecules

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“…Ammonia volatilization was evaluated using the enclosure and indophenol blue spectrophotometry techniques [20,21]. Ammonia in the sealed container was absorbed into a dilute sulfuric acid solution, following which the absorption solution was analyzed by spectrophotometry.…”

Section: Measurement Of Soil Ammonia Volatilizationmentioning

confidence: 99%

Assessment of Ammonia Volatilization Losses and Nitrogen Utilization during the Rice Growing Season in Alkaline Salt-Affected Soils

Huang

Zhang

et al. 2017

Sustainability

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Abstract:The objectives of this study were to evaluate the effects of different fertilizer types and application rates on ammonia volatilization loss and to explore nitrogen distribution and nitrogen use efficiency using the 15 N isotope tracing technique in different alkaline salt-affected conditions in the Songnen Plain, Northeast China. The results showed a decreasing trend in ammonia volatilization loss from ammonium nitrate and ammonium sulfate, but not that from urea, as the electrical conductivity gradient increased, whereas the reverse trend was found as the pH gradient increased. Ammonia volatilization loss increased in moderately salt-affected soil compared with that in slightly salt-affected soil, particularly during the tillering stage, regardless of the N fertilizer rate. The percentage of N absorbed by rice plants increased from urea but decreased from the soil as the amount of nitrogen was increased. Interestingly, the N retention rate in soil decreased and rice grain yield and nitrogen agronomic efficiency increased as the amount of nitrogen increased in both salt-affected soil conditions. The nitrogen application amount of highest N physiological efficiency was 225 kg·N/ha. Considering high rice production and a minimal environmental threat, we should fully consider controlling ammonia volatilization losses by adjusting the fertilizer type and the crop stage when the fertilizer is applied.

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“…A number of methods are available for the determination of NH 3 , including the flow injection analysis [2], spectrophotometry [3], fluorescence [4] and various electrochemical methods. Due to the intrinsic advantages in rapidity, sensitivity and simplicity, the electrochemical sensors have been extensively developed for NH 3 detection [1,[5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Electrochemiluminescence of iridium complexes with ammonia in dimethylformamide and its analytical application for ammonia detection

Zhu

Ding

et al. 2012

Journal of Electroanalytical Chemistry

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Collection of Indonaphthol Blue on a Membrane Filter for the Spectrophotometric Determination of Ammonia with 1-Naphthol and Dichloroisocyanurate

Cited by 14 publications

References 17 publications

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

Evaluation of Water Ammonium Ion Test Kit and Its Feasibility for the Analysis of Protein in Food

Assessment of Ammonia Volatilization Losses and Nitrogen Utilization during the Rice Growing Season in Alkaline Salt-Affected Soils

Electrochemiluminescence of iridium complexes with ammonia in dimethylformamide and its analytical application for ammonia detection

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