研究者詳細 - 丸尾　雅啓

論文 - 丸尾　雅啓

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Phosphate oxygen isotope insights into the coupled distribution of phosphorus, iron, and manganese in lake sediments 査読

Takuya Ishida, Noboru Okuda, Shin-ichi Onodera, Mitsuyo Saito, Yusuke Tomozawa, Xin Liu, Naoshige Goto, Ken'ichi Osaka, Masahiro Maruo, Ichiro Tayasu, Syuhei Ban

Chemical Geology 683 122754 - 122754 2025年6月

Spatio-temporal variations of orthophosphate in a large mesotrophic Lake Biwa; its implications for phytoplankton productivity 査読国際共著

Xin Liu, Rong Yi, Miwa Ohashi, Masahiro Maruo, Yasushi Iseri, Aimin Hao, Min Zhao, Syuhei Ban

Inland Waters 2025年1月

Eggshell waste as a promising adsorbent for phosphorus recovery from wastewater: A review 査読国際共著

Protima Sarker, Xin Liu, Md. Shiblur Rahaman, Masahiro Maruo

Water Biology and Security 4 ( 1 ) 2024年11月

Thermally modified bamboo-eggshell adsorbent for phosphate recovery and its sustainable application as fertilizer 査読国際誌

Protima Sarker, Xin Liu, Naoki Hata, Hiroki Takeshita, Hiroshi Miyamura, Masahiro Maruo

Environmental Research 231 ( Part 1 ) 115992 2023年8月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Elsevier 参加形態：共同（主担当）

Phosphate recovery from wastewater using readily available biowaste-based adsorbents is beneficial for both eutrophication control and waste management. Bamboo char has a high-density porous structure and eggshell contains CaCO3 with high affinity for phosphate. The combination of calcined bamboo and eggshell is a potential adsorbent for P recovery that has not been tested previously. Because bamboo char and eggshell both are popular for soil amendment, a P-loaded bamboo and eggshell composite is a promising fertilizer for long-term soil improvement. In this work, the feasibility of calcined bamboo and eggshell (BE) for P recovery and its use as fertilizer were investigated. The adsorption capacity and mechanism were examined using adsorption kinetic, isotherm, and thermodynamic analysis. The kinetic study showed that the experimental data sets were fitted best by a pseudo second-order model, indicating chemisorption. The Langmuir isotherm model estimated maximum adsorption capacities of 95.14 and 98.40 mg/g for BE 1:1 and 2:1 adsorbent. Monolayer adsorption occurred on a homogenous surface. The adsorption reaction was non-spontaneous at 298 K and exothermic for the BE 1:1 and 2:1 adsorbent, and the calculated Langmuir separation factor indicated favorable conditions for P adsorption. The desorption study showed lower P desorption capacity in water than in neutral ammonium citrate. P-loaded eggshell-modified bamboo char was an effective slow-release fertilizer for Japanese mustard spinach cultivation, which is a sustainable and environment friendly use of P-loaded materials.

DOI： 10.1016/j.envres.2023.115992

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Assessment of Heavy Metals pollution and contamination in Sediment of the Dhaleswari River, Bangladesh 査読国際誌

Abdullah Al Mamun, Protima Sarker, Md. Shiblur Rahaman, Md. Mahbub Kabir, Masahiro Maruo

International Journal of Environment 10 ( 1 ) 1 - 19 2021年7月

Grain size distribution and chemistry of the brackish Lake sediment in Korea 査読国際誌

I Chan Shin, Tetsuji Akatsuka, Hisayuki Azumi, Lan Ao, Nozomi Amahashi, Maki Oyagi, Noriko Ishida, Naoshige Goto, Masahiro Maruo, Akihiko Yagi, Yashshi Seike, Seung Hyun Lee, Sung Ae Yoon, Jun Kil Choi, Young Woong Byeon, Byung Mo Lee, Osamu Mitamura,Kwang Jin Cho

Environmental Engineering Research 26 ( 5 ) 200365 - * 2020年10月

Dual stable isotope characterization of excess methane in oxic water of a mesotrophic lake 査読国際誌

UrumuTsunogai, Yuko Miyoshi, Toshiyuki Matsushita, Daisuke D. Komatsu, Masanori Ito, Chiho Sukigara, Fumiko Nakagawa, Masahiro Maruo

Limnology and Oceanography 65 ( 2 ) 2937 - 2952 2020年7月

Differences in dissolved phosphate in shallow-lake waters as determined by spectrophotometry and ion chromatography 査読

Yi R., Song P., Liu X., Maruo M., Ban S.

Limnology 21 ( 3 ) 329 - 339 2019年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer 参加形態：共同（副担当）

© 2019, The Japanese Society of Limnology. Phosphorus (P) plays important roles in aquatic ecosystems, but accurately determining phosphorus species (particularly bioavailable phosphate) is difficult. When phosphate concentrations are spectrophotometrically measured as soluble reactive P (SRP), the actual values are often overestimated. Ion chromatography is one method for accurately measuring orthophosphate concentrations. To clarify how the spectrophotometrical measurement overestimates actual phosphate concentrations, we compared estimates of phosphate concentrations in lake waters using both methods. SRP and orthophosphate concentrations in water samples collected from four shallow lakes around Lake Biwa, Japan, were determined monthly for 1 year by spectrophotometry and ion chromatography, respectively. SRP concentrations were frequently higher than those for orthophosphate in all lakes throughout the study period, suggesting that SRP and orthophosphate are not equivalent, although a significant relationship was found between them. Orthophosphate/SRP (ortho/SRP) ratios varied spatiotemporally in all lakes (range 0.11–1.04; mean 0.56), being well predicted by biological-mediated relevant parameters using a stepwise multiple logistic regression analysis (R 2 = 0.76). The results implied that organic matter associated with biological activity contributes to the variability in ortho/SRP ratios. Such large variability in ortho/SRP ratios emphasizes the importance of accurate orthophosphate estimates for understanding P dynamics in aquatic ecosystems.

DOI： 10.1007/s10201-019-00574-2

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イオンクロマトグラフィーを用いる天然水中微量メチルホスホン酸の定量査読

辻一真・丸尾雅啓・小畑元

Bunseki Kagaku 68 ( 4 ) 275 - 278 2019年4月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Bunseki Kagaku

© 2019 The Japan Society for Analytical Chemistry. By using ion chromatography (IC), we developed a highly sensitive method for the determination of methylphosphonate present in natural water with an arrangement of the chromatographic conditions that fit for trace phosphate ion in P-limited Lake. IonPac AS-23 (Thermo Fisher Scientific) was applied as analytical column. For the suppression of baseline electroconductivity, an external mode was applied to reduce the baseline noise of chromatograms. The eluent concentration was reduced to half from the recommended condition for an effective separation of the peak of methylphosphonate from those of major anions (sulfate, phosphate, and nitrate). As the peak area linearly increased with an increase in the sample injection volume up to 5 mL, this volume was applied for the analysis of natural samples. The peak area showed a linear increase from 0 to 10 nmol L–1 (R2 = 0.9982). The detection limit was 5 pmol L–1 (S/N = 3). Methylphosphonate was clearly detected in samples from anoxic spring water and from that of R. Amano close to that spring with a concentration of 2.9 nmol L–1 and 2.3 nmol L–1, respectively.

DOI： 10.2116/bunsekikagaku.68.275

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Determination of dissolved and particulate thiols in Lake Biwa water and extracted fulvic acids by solid phase extraction followed by HPLC with fluorescence detection 査読

Rasheduzzaman Md., Mai Kawaguchi, Hajime Obata, Masahiro Maruo

Limnology 19 ( 3 ) 299 - 309 2018年8月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Limnology

© 2018, The Japanese Society of Limnology. Thiols are important antioxidants that can modulate the bioavailability and biogeochemistry of many soft metals, although their detection remains challenging in both their reduced (R–S) and oxidized (R–S–S–R) forms. Here, a modified biochemical method was applied to determine the levels of dissolved and particulate thiols in Lake Biwa water and extracted Lake Biwa fulvic acids obtained at various depths. This method involves the use of the reducing agent tris(2-carboxyethyl)phosphine and the fluorescent label 7-fluorobenzofurazan-4-sulfonic acid ammonium salt (SBD-F), followed by solid-phase extraction and HPLC with fluorescence detection. Dissolved cysteine (Cys) (2.0–6.0 nM), glutathione (GSH) (2.8–5.1 nM), and N-acetyl-l-cysteine (NAC) (1.6–4.2 nM) were detected throughout the water column but were broadly consistent at depths of 5–20 m. In contrast, abundant levels of particulate cysteine (1.3–3.5 × 102nM) and glutathione (1.6–3.1 × 102nM) were detected down to depths of 15 m. The particulate cysteine and glutathione were significantly covariant, and the ratios between them reflected the differences in the plankton community composition and availability of these compounds. This work also studied the concentrations of Cys, GSH and NAC in Lake Biwa fulvic acids (LBFAs) for the first time (at 0 m: cysteine, 0.8 nM; glutathione, 1.6 nM; NAC, 2.5 nM; at 10 m: cysteine, 1.4 nM; glutathione, 0.6 nM; NAC, 1.6 nM). The nanomolar to sub-nanomolar concentrations of the particulate and dissolved Cys, GSH and NAC in the lake indicates that these are an important class of ligands for chalcophile metals and may influence the distribution of plankton communities from the epilimnion to the hypolimnion of the lake.

DOI： 10.1007/s10201-018-0547-1

Scopus

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Assessment of the Status of Groundwater Arsenic at Singair Upazila, Manikganj Bangladesh; Exploring the Correlation with Other Metals and Ions 査読

Md. Mostafizur Rahman, Rebeka Sultana, Mashura Shammi, Joti Bikash, Tanveer Ahmed, Masahiro Maruo, Masaaki Kurasaki, M. Khabir Uddin

Exposure and Health 8 ( 2 ) 217 - 225 2016年2月

Trace elements influenced by environmental changes in Lake Biwa: (I) Seasonal variations under suboxic hypolimnion conditions during 2007 and 2009 査読

Yusuke Nakashima, Akiyoshi Shimizu, Masahiro Maruo, Yoshiki Sohrin

Limnology 17 ( 2 ) 151 - 162 2016年1月

Trace elements influenced by environmental changes in Lake Biwa: (II) Chemical variations in the hypolimnion over the last half-century 査読

Yoshiki Sohrin, Yusuke Nakashima, Masahiro Maruo

Limnology 17 ( 2 ) 163 - 173 2016年1月

Determination of aquatic humic substances in Japanese lakes and wetlands by the carbon concentration-based resin isolation technique 査読

Kumiko Tsuda, Morimaru Kida, Suzuka Aso, Taku Kato, Nobuhide Fujitake, Masahiro Maruo, Kazuhide Hayakawa, Mitsuru Hirota

Limnology 17 ( 1 ) 1 - 6 2015年12月

Comparison of soluble reactive phosphorous and orthophosphate concentrations in river waters 査読

Masahiro Maruo, Mana Ishimaru, Yuma Azumi, Yuki Kawasumi, Osamu Nagafuchi, Hajime Obata

Limnology 17 ( 1 ) 7 - 12 2015年12月

Annual layers in river-bed sediment of a stagnant river-mouth area of the Kitagawa Brook, Central Japan 査読

Yoshimasa Kurashige, Toshiaki Nakano, Eri Kasubuchi, Masahiro Maruo, Hanako Domitsu

IAHS-AISH Proceedings and Reports: International Symposium on Sediment Dynamics: From the Summit to the Sea, ICCE 2014; Astor Crowne PlazaNew Orleans; United States; 11 December 2014 through 14 December 2014; Code 115823 367 251 - 257 2014年12月

びわ湖内湖・西の湖における水環境教育査読

三田村緒佐武、石川聡子、石田典子、後藤直成、橘淳治、丸尾雅啓

陸水研究 1 ( 1 ) 5 - 15 2014年7月

Characteristics and role of groundwater dissolved organic matter on arsenic mobilization and poisoning in Bangladesh 査読

Tareq S. M., M. Maruo, K. Ohta

Physics and Chemistry of the Earth, Parts A/B/C 58-60 77 - 84 2013年5月

Binding interactions of 1-naphthol with dissolved organic matter of Lake Biwa and treated sewage wastewater: the role of microbial fulvic acid 査読

Tanveer Ahmed, Keiichi Ohta, Osamu Nagafuchi, Masahiro. Maruo

Environmental Toxicology & Chemistry 31 ( 10 ) 2201 - 2209 2012年5月

Seasonal characteristics of surface water fulvic acids from Lake Biwa and Lake Tankai in Japan 査読

Fujitake N., K. Tsuda, S. Aso, H. Kodama, M. Maruo, K. Yonebayashi

Limnology 13 ( 1 ) 45 - 53 2012年4月

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