Faculty Profiles - SUDO Miki

Papers - SUDO Miki

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Quantitation of guanidine derivatives as representative persistent and mobile organic compounds in water: method development Reviewed

Ichihara M., Asakawa D., Yamamoto A., Sudo M.

Analytical and Bioanalytical Chemistry 2023.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Analytical and Bioanalytical Chemistry

Persistent and mobile organic compounds (PMOCs) are highly soluble in water, thereby posing a threat to water resource quality. Currently, there are no methods that can accurately quantify guanidine derivative PMOCs, other than 1,3-diphenylguanidine (DPG) and cyanoguanidine (CG), in aqueous media. In this study, we developed a quantitation method that combines solid-phase extraction and liquid chromatography (LC)-tandem mass spectrometry to detect seven guanidine derivatives in aquatic environments and applied it to environmental water samples. Five LC columns were examined, and among them, a hydrophilic interaction liquid chromatography column was chosen owing to its suitable instrument detection limit and retention factor. Method precision was assessed using seven replicate analyses of river water. The corresponding analyte recoveries ranged from 73 to 137% (coefficient of variation = 2.1–5.8%). DPG and CG were detected in ultrapure water samples at levels up to 0.69 and 150 ng L−1, respectively; DPG and CG levels up to 44 and 2600 ng L−1, respectively, were detected in lake water, river water, sewage effluent, and tap water sampled in Western Japan. This is the first reported detection of DPG in the surface water of Japan, revealing that DPG and CG are ubiquitous compounds in aquatic environments. Moreover, this is the first study to detect 1-(o-tolyl)biguanide and N,N′′′-1,6-hexanediylbis(N′-cyanoguanidine) in water. This study provides a foundation for further research on the distribution, fate, and emission source of these pollutants, which is critical to maintain high water quality and to determine regulatory limits for these pollutants. Graphical Abstract: [Figure not available: see fulltext.].

DOI： 10.1007/s00216-023-04613-x

Scopus

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水環境中に残留する水田施用農薬のPolar Organic Chemical Integrative Sampler（ POCIS）とグラブサンプリングによる時間加重平均濃度の比較 Reviewed

須戸幹、梶原暢人、岩間憲治

水環境学会誌 45 ( 2 ) 41 - 50 2022

水環境中に残留する水田施用農薬のPolar Organic Chemical Integrative Sampler（ POCIS）とグラブサンプリングによる時間加重平均濃度の比較 Reviewed

須戸幹, 梶原暢人, 岩間憲治

水環境学会誌 45 ( 2 ) 41 - 50 2022

Hexabromocyclododecane in riverine and estuarine sediments from Osaka, Japan: spatial distribution and concentration variability within identical samples Reviewed

Ichihara M., Yamamoto A., Kakutani N., Funasaka K., Sudo M.

Environmental Science and Pollution Research 27 ( 28 ) 35782 - 35791 2020.10

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Science and Pollution Research

In this study, hexabromocyclododecane (HBCD) in riverine and estuarine sediments was investigated in Osaka, Japan. The mean total HBCD concentration detected in sediments ranged from < 0.50 to 130 ng g dry weight. This exceeded the ubiquitous HBCD contamination level found globally but was lower than that in areas affected by point sources, such as textile industries and expanded polystyrene plants. Sewage effluent was one of the suspected point sources of HBCD in the study area. The HBCD concentrations in sediments were highly dependent on certain factors, such as the location of the sampling site (proximity to possible emission sources), sediment properties (silt or sand), and organic substance content. The range of the diastereomer composition of α- and γ-HBCD was wider than that in other studies. Repeatability tests (n = 3) were conducted for all samples to assess the variability in the HBCD concentrations within identical sediment samples. Some variations were observed in the HBCD concentrations and diastereomer compositions within the repeatability test results at some sampling sites; nevertheless, the same samples were extracted and analyzed in triplicate. The bromine contents of the extracts of these samples were analyzed by X-ray fluorescence, and the results agreed well with those estimated from the LC-MS/MS results. From these results, it was confirmed that several sediment samples contained heterogeneously distributed HBCD. The risk characterization ratios (predicted environmental concentration/predicted no-effect concentration) of sites with high HBCD concentrations ranged from 0.1 to 1; thus, further information is required, and the sediment HBCD levels in this region should be continuously studied. −1

DOI： 10.1007/s11356-020-09856-0

Scopus

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Inhomogeneity of sediment samples in analysis of hexabromocyclododecane Reviewed

Ichihara M., Yamamoto A., Kakutani N., Takakura K., Sudo M.

Environmental Monitoring and Assessment 191 ( 7 ) 2019.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Monitoring and Assessment

© 2019, Springer Nature Switzerland AG. The repeatability test of the analytical method for hexabromocyclododecane (HBCD) was conducted with sediment sample. The maximum HBCD concentration exceeded the minimum by a factor of 90 even though the identical sediment samples were used. Therefore, we examined which step of the analytical method was the factor causing variability. We examined the blank test, and confirmation test of the extraction and purified procedure. From these results, we confirmed that there was nothing wrong with the accuracy of our analytical method. These results indicate that the variability of HBCD concentration in the repeatability test was attributed not to the analytical method, but to the inhomogeneity of the sediment sample. Aluminum, silicon, and organic carbon in sediments were measured to compare the variability of these concentrations with that of HBCD concentration. These concentrations were similar values within identical samples which showed variability in HBCD concentration. HBCD concentration in several samples did not correlate with organic carbon content. These results suggests that sediment samples were homogeneous by itself, and HBCD was heterogeneously distributed in spite of homogeneity of organic carbon in sediment. The sediment sample with variability in HBCD concentration showed different HBCD diastereomer compositions in identical sediment. It implies that the sample contained HBCD derived from different histories or point sources. Even though we increased sample amounts to analyze the homogeneity of the sample, HBCD concentration varied within identical samples if the sample had a hot spot. Past monitoring data may contain overestimation or underestimation of HBCD concentration in sediment.

DOI： 10.1007/s10661-019-7553-6

Scopus

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Inhomogeneity of sediment samples in analysis of hexabromocyclododecane Reviewed

Ichihara M, Yamamoto A, Kakutani N, Takakura K, Sudo M

Environmental Monitoring and Assessment 191 ( 7 ) 2019.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Monitoring and Assessment

DOI： 10.1007/s10661-019-7553-6

農薬の農耕地から河川への流出に関する研究 Invited

須戸幹

水環境学会誌 42A ( 11 ) 381 - 385 2019

農薬の農耕地から河川への流出に関する研究 Invited

須戸幹

水環境学会誌 42A ( 11 ) 381 - 385 2019

Uptake and elimination kinetics of trifluralin and pendimethalin in Pheretima spp. and Eisenia spp. Reviewed

Goto Y., Sudo M.

Environmental Science and Pollution Research 25 ( 13 ) 12352 - 12360 2018.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Science and Pollution Research

© 2018, Springer-Verlag GmbH Germany, part of Springer Nature. The purpose of this study was to clarify the kinetic bioaccumulation potential of herbicides in the earthworm, Pheretima spp., the most common earthworms throughout Asia, and Eisenia spp., litter-feeding earthworms included in the test species recommended by the Organization for Economic Co-operation and Development. The kinetic bioaccumulation factors of trifluralin and pendimethalin were estimated from an uptake test for 10 or 12 days and from an elimination test for 10 days. The time required to reach a steady state following herbicide exposure was 7 days for both herbicides in Eisenia spp. and 1 day in Pheretima spp. The uptake rate constant (g-soil/g-worm/day) and elimination rate constant (per day) for trifluralin were 2.1 and 0.23 in Eisenia spp. and 0.42 and 0.45 in Pheretima spp., respectively, and those for pendimethalin were 1.5 and 0.26 in Eisenia spp. and 0.27 and 1.0 in Pheretima spp., respectively. Kinetic bioaccumulation factors of both herbicides were relatively close to bioaccumulation factors in steady state and were higher in Eisenia spp. (8.9 for trifluralin and 5.7 for pendimethalin) than in Pheretima spp. (0.95 and 0.26). These results demonstrated that the herbicide bioaccumulation risk is lower for Pheretima spp. than for Eisenia spp. because of the lower uptake rate and higher elimination rate in Pheretima spp.

DOI： 10.1007/s11356-018-1483-7

Scopus

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Uptake and elimination kinetics of trifluralin and pendimethalin in Pheretima spp. and Eisenia spp. Reviewed

Yuko Goto, Miki Sudo

Environmental Science and Pollution Research 25 ( 13 ) 12352 - 12360 2018.5

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Verlag

The purpose of this study was to clarify the kinetic bioaccumulation potential of herbicides in the earthworm, Pheretima spp., the most common earthworms throughout Asia, and Eisenia spp., litter-feeding earthworms included in the test species recommended by the Organization for Economic Co-operation and Development. The kinetic bioaccumulation factors of trifluralin and pendimethalin were estimated from an uptake test for 10 or 12 days and from an elimination test for 10 days. The time required to reach a steady state following herbicide exposure was 7 days for both herbicides in Eisenia spp. and 1 day in Pheretima spp. The uptake rate constant (g-soil/g-worm/day) and elimination rate constant (per day) for trifluralin were 2.1 and 0.23 in Eisenia spp. and 0.42 and 0.45 in Pheretima spp., respectively, and those for pendimethalin were 1.5 and 0.26 in Eisenia spp. and 0.27 and 1.0 in Pheretima spp., respectively. Kinetic bioaccumulation factors of both herbicides were relatively close to bioaccumulation factors in steady state and were higher in Eisenia spp. (8.9 for trifluralin and 5.7 for pendimethalin) than in Pheretima spp. (0.95 and 0.26). These results demonstrated that the herbicide bioaccumulation risk is lower for Pheretima spp. than for Eisenia spp. because of the lower uptake rate and higher elimination rate in Pheretima spp.

DOI： 10.1007/s11356-018-1483-7

Scopus

Herbicide discharge from rice paddy fields by surface runoffand percolation flow: A case study in paddy fields in the Lake Biwa basin, Japan Reviewed

Sudo M., Goto Y., Iwama K., Hida Y.

Journal of Pesticide Science 43 ( 1 ) 24 - 32 2018.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Pesticide Science

© Pesticide Science Society of Japan. The transport of three herbicides, pyriminobac-methyl, imazosulfuron and pyraclonil from a watershed that includes 40 ha of paddy fields to a drainage canal was monitored in the Lake Biwa basin, Japan. Based on the intensive monitoring of all paddy plots and in the drainage canal conducted on 3 days during and after the application period, the passage of herbicide discharge from the paddy fields to the drainage canal was separated into surface runoffobtained from field observations and percolation flow calculated from the herbicide mass balance. Surface runofffrom paddy plots immediately after herbicide application, discharging a large volume of paddy water, or both processes in conjunction had a significant effect on herbicide discharge. Without surface runoff, paddy fields discharged a consistently high amount of herbicide gradually by percolation flow. These results suggest that considerable amounts of herbicides were discharged into the drainage canal through percolation even if appropriate water management to prevent herbicide surface runoffwas practiced.

DOI： 10.1584/JPESTICS.D17-061

Scopus

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Herbicide discharge from rice paddy fields by surface runoffand percolation flow: A case study in paddy fields in the Lake Biwa basin, Japan Reviewed

Sudo M, Goto Y, Iwama K, Hida Y

Journal of Pesticide Science 43 ( 1 ) 24 - 32 2018.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Pesticide Science

DOI： 10.1584/jpestics.D17-061

A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification Reviewed

Ichihara M., Yamamoto A., Kakutani N., Sudo M., Takakura K.

Environmental Science and Pollution Research 24 ( 3 ) 2667 - 2674 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Science and Pollution Research

© 2016, Springer-Verlag Berlin Heidelberg. We developed a statistical model that quantitatively incorporated the stochastic fluctuations of values, which were estimated as Bayesian credible intervals (BCIs), to analyze environmental monitoring data. We used α-hexabromocyclododecane (α-HBCD) diastereomer compositions of water samples that included data points below limit of quantification. To avoid replacing “not detected (ND)” values with irrelevant values in data analysis, we substituted ND with observed values from the measurement system upon examination of the model. In our study, it was assumed that the magnitude of stochastic fluctuations of observed values in environmental samples was identical to that in iterative measurements of a standard solution at the lowest concentration. Using this model, α-HBCD diastereomer compositions could be estimated along with BCIs even for samples collected from sites where concentrations of α-HBCD were ND or near limit of quantification. The brackish areas in our study showed relatively wide ranges in composition for the 95% BCIs compared with samples from fresh water areas. In the brackish areas, concentrations of HBCD were frequently ND or near limit of quantification. Using this model, it was unnecessary to replace ND with zero or limit of quantification in data analysis, and an environmental assessment could be achieved using all of the data. Therefore, this model is considered to be a widely applicable approach in the analysis of environmental monitoring data including ND.

DOI： 10.1007/s11356-016-7990-5

Scopus

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A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification Reviewed

Makiko Ichihara, Atsushi Yamamoto, Naoya Kakutani, Miki Sudo, Koh-ichi Takakura

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 24 ( 3 ) 2667 - 2674 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER HEIDELBERG

We developed a statistical model that quantitatively incorporated the stochastic fluctuations of values, which were estimated as Bayesian credible intervals (BCIs), to analyze environmental monitoring data. We used alpha-hexabromocyclododecane (alpha-HBCD) diastereomer compositions of water samples that included data points below limit of quantification. To avoid replacing "not detected (ND)" values with irrelevant values in data analysis, we substituted ND with observed values from the measurement system upon examination of the model. In our study, it was assumed that the magnitude of stochastic fluctuations of observed values in environmental samples was identical to that in iterative measurements of a standard solution at the lowest concentration. Using this model, alpha-HBCD diastereomer compositions could be estimated along with BCIs even for samples collected from sites where concentrations of alpha-HBCD were ND or near limit of quantification. The brackish areas in our study showed relatively wide ranges in composition for the 95% BCIs compared with samples from fresh water areas. In the brackish areas, concentrations of HBCD were frequently ND or near limit of quantification. Using this model, it was unnecessary to replace ND with zero or limit of quantification in data analysis, and an environmental assessment could be achieved using all of the data. Therefore, this model is considered to be a widely applicable approach in the analysis of environmental monitoring data including ND.

DOI： 10.1007/s11356-016-7990-5

Web of Science

A Bayesian approach for estimating hexabromocyclododecane (HBCD) diastereomer compositions in water using data below limit of quantification Reviewed

Makiko Ichihara, Atsushi Yamamoto, Naoya Kakutani, Miki Sudo, Koh-ichi Takakura

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 24 ( 3 ) 2667 - 2674 2017.1

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER HEIDELBERG

DOI： 10.1007/s11356-016-7990-5

Web of Science

水田からの窒素、リン、COD流出負荷量能実態と課題 Reviewed

治多伸介、須戸幹　他

水環境学会誌 38 ( 4 ) 81 - 91 2015

Effluent N, P and COD Loads from Paddy Fields in Japan: A Critical Review Reviewed

HARUTA Shinsuke, SUDO Miki, EGUCHI Sadao, OKUBO Takuya, KURODA Hisao, TAKEDA Ikuo, FUJIWARA Taku, YAMAMOTO Tadao, HITOMI Tadayoshi, SHIRATANI Eisaku, YOKOTA Kuriko, INOUE Takanobu

Japan journal of water pollution research 38 ( 4 ) 81 - 91 2015

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society on Water Environment

While the effluent pollutant loads of nitrogen, phosphorus, and COD from paddy fields are very important basic figures in a wide variety of environmental planning and research tasks, more reliable figures have been required. In this paper, the database of the pollutant load from paddy fields in Japan, established by the authors, is explained and the analytical results and future issues are presented. The database is based on the 72 references published since 1980s and it includes 467 data sets of the pollutant loads and information on the references, and investigation and farming conditions. The investigation of the irrigation season and the verification of the effects of the wide variety of improved farming methods during the irrigation season have been conducted in Japan. However, data for nonirrigation season and specific data obtained in paddy fields cultivated using variety of farming methods will be needed. The verification of the effects of the improved farming methods in the nonirrigation season and the development of the best management practices for the reduction of the pollutant load in the nonirrigation season are also required. The figures for phosphorus and COD adopted for the Seventh Total Water Pollutants Reduction Plan and the water conservation plan for selected lakes are much lower than the average values for by conventional farming methods available in the database. Therefore, the values for the Seventh Total Water Pollutants Reduction Plan will be revised referring to our database. The pollutant load from a paddy field cultivated by custom farming decreased with the decrease in the amount of fertilizer used. Thus, the recent data will be of great value. Other countries are facing a shortage of the data on pollutant loads in paddy fields. In the countries, there is a lack of experience in improving methods of farming to reduce the pollutant loads in paddy fields. Therefore, our database will be useful for other countries. The database is available on the web, and it is expected to contribute to future governmental and research activities.

DOI： 10.2965/jswe.38.81

CiNii Books

Other Link： https://jlc.jst.go.jp/DN/JLC/20012936012?from=CiNii

Distribution and pollutant load of hexabromocyclododecane (HBCD) in sewage treatment plants and water from Japanese Rivers Reviewed

Makiko Ichihara, Atsushi Yamamoto, Koh-ichi Takakura, Naoya Kakutani, Miki Sudo

CHEMOSPHERE 110 78 - 84 2014.9

Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Hexabromocyclododecane diastereoisomers (alpha-, beta-, gamma-, delta-, and epsilon-HBCD) were investigated in river water, sewage influent, and sewage effluent from the Yodo River basin, Japan. The mean annual values of HBCDs ranged from 0.19 to 14 ng L-1 in river water. We observed that the concentrations of HBCDs in the brackish water area were low compared with that in the fresh water area. It was implied that, when the flow of the river stagnated in the estuarine area, HBCDs settled with suspended matter because of their hydrophobic character. In the sewage treatment plants, HBCDs ranged from 16 to 400 ng L-1 in sewage influent, whereas they ranged from 0.39 to 12 ng L-1 in sewage effluent. Over 90% of HBCDs were removed from the wastewater in the sewage treatment plants. By using these results, we estimated the pollutant load of HBCDs that flows into Osaka Bay from the study area. It was estimated that approximately 15 kg of HBCDs flow into Osaka Bay from the study area in a year. This value is five orders of magnitude lower than the 2010 market demand for HBCDs (3019 metric tons) in Japan. (C) 2014 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.chemosphere.2014.03.074

Web of Science

Distribution and pollutant load of hexabromocyclododecane (HBCD) in sewage treatment plants and water from Japanese Rivers Reviewed

Makiko Ichihara a, Atsushi Yamamoto, Koh-ichi Takakura, Naoya Kakutani, Miki Sudo

Chemosphere 110 78 - 84 2014

An Attempt to Create Depths for Fish Wintering in an Agricultural Canal during a Non-irrigation Period Reviewed

A. Minagawa, K. Takaki, M. Sudo, OH. Odani, K. Iwama, R. Kaneki

Irrigation, Drainage and Rural Engineering Journal 80 ( 5 ) 445 - 454 2012

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japanese Society of Irrigation, Drainage and Rural Engineering

The following 3 types of depths were created to investigate the effects on wintering fish in an agricultural canal: (1) a 30-cm-deep dammed section of the canal; (2) a 60-cm -deep hand-dug section of the canal that was covered; and (3) a 60-cm-deep hand-dug section of the canal that was left uncovered. The number of fish species, fish density and the diversity index were compared at each sampling station during the same months the previous year.<br>The 3 above-mentioned parameters showed increased values after the depths were created. Fish density in the covered 60-cm-deep section was higher than that in the 60-cm-deep section with no cover. Moreover, the fish marked previously in the mark and recapture method either remained at the same depth or moved from a depth with no cover to a covered depth. Therefore, the depth with a cover could be especially effective for fish wintering. Consequently, bank trees, overhead banks, and submerged plants should be conserved as a cover for wintering fish.

DOI： 10.11408/jsidre.80.445

CiNii Books

Other Link： https://jlc.jst.go.jp/DN/JALC/10024829990?from=CiNii

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